Four parallel word clock outputs allow the 2192 to be used as a m
SERVICE MANUAL SPECIFICATIONS: Power Output 120W RMS into 8 Ohms 200W RMS into 4 Ohms THD (unweighted) < 0.0015% 1 kHz at 80% of rated power < 0.015% 20Hz – 20kHz at 80% of rated power Frequency Response 10Hz – 50kHz /- 1dB
840A Issue Date: 16th June 2006 ________________________________________________________________________________ SERVICE MANUAL ________________________________________________________________________________ SPECIFICATIONS: Power Output 120W RMS into 8 Ohms 200W RMS into 4 Ohms THD (unweighted) < 0.0015% 1 kHz at 80% of rated power < 0.015% 20Hz 20kHz at 80% of rated power Frequency Response 10Hz 50kHz +/- 1dB S/N ratio (ref 1W/8 Ohm) >83dB Input Impedances Input 1 (balanced) 10 kOhm Inputs 2-7 68 kOhm Tape Input 68 kOhm Power Amp damping factor > 110 at 1kHz Max power consumption 800W Minimum power consumption Active (no signal) 70W Standby 7W Bass & Treble controls Shelving type Max bass boost/cut +/- 10dB at 10Hz Max treble boost/cut +/- 7.5dB at 20Hz Dimensions (H x W x D) 115 x 430 x 385mm (4.5 x 16.9 x 15.2") Weight 15.0kg (33Lbs) Gallery Court Hankey Place London SE1 4BB UK Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 AP19597/1 1 840A SERVICE MANUAL TABLE OF CONTENTS Safety Precautions & Important Notes Block Diagram Exploded Diagram Exploded Diagram Parts List Front Panel PCB Schematic (Microcontroller & LCD) Front Panel PCB Schematic (Shift Registers) Front Panel PCB Layout (Top Side) Front Panel PCB Layout (Bottom Side) Front Panel PCB BOM Input PCB Schematic (Input Select) Input PCB Schematic (Input Control) Input PCB Schematic (Input Amplifier) Input PCB Board Layout (Top Side) Input PCB Board Layout (Bottom Side) Input PCB BOM Preamp PCB Schematic (Relay Logic) Preamp PCB Schematic (Tone Control) Preamp PCB Schematic (Post Amp) Preamp PCB Board Layout (Top Side) Preamp PCB Board Layout (Bottom Side) Preamp PCB BOM Power Amplifier Schematic (Right Power Supplies & PSU) Power Amplifier Schematic (Right Channel) Power Amp Right & PSU PCB Board Layout (Top Side) Power Amp Right & PSU PCB Board Layout (Bottom Side) Power Amp Right PCB BOM Power Amp PSU PCB BOM Power Amp Schematic (Left Channel) Power Amp Schematic (Left Power Supplies) Power Amp PCB Board Layout (Top Side) Power Amp PCB Board Layout (Bottom Side) Power Amp Left PCB BOM Hub PCB Schematic 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24-25 26 27 28 29 30-31 32 33 34 35 36 37-38 39 2 Hub PCB Board Layout (Top Side) Hub PCB Board Layout (Bottom Side) Hub PCB BOM Rectifier PCB Schematic Rectifier PCB Board Layout (Top Side) Rectifier PCB Board Layout (Bottom Side) Rectifier PCB BOM IC Pin Layout Details Technical Description Procedure to upgrade the Control (Pic) Software Notes 40 41 42-43 44 45 46 47 48-49 51-60 61-62 63 3 SAFETY PRECAUTIONS & IMPORTANT NOTES 1. Check that the rear of the product indicates the correct supply voltage for your area. 2. The lighting flash with the arrowhead within an equilateral triangle is intended to alert the user or service agent to the presence of dangerous voltages within the product enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. 3. The exclamation point within an equilateral triangle is intended to alert the user or service agent to the presence of important operating and maintenance (Servicing) instructions in the literature accompanying the appliance. 4. This product complies with EEC Low Voltage (73/23/EEC) and Electromagnetic Compatibility (89/336/EEC) Directives when used and serviced in accordance with this manual. For continued compliance all components marked safety and EMC critical must only be replaced by Cambridge Audio approved parts. 5. Any unauthorised design alterations or additions will void the manufacturer's warranty; furthermore the manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom. 6. When servicing, care should be taken to observe the original routing and dressing of the leads and it should be confirmed that they have been returned to normal after re-assembly. Notes on chip component replacement Never reuse a component that has been removed from a PCB Notice that the minus side of a tantalum capacitor may be damaged by heat COPYRIGHT NOTICE. © 2007 Audio Partnership PLC. All rights reserved. Cambridge Audio and Azur are registered trademarks for Audio Partnership PLC. This document may not be reproduced, distributed, transmitted, displayed, published, or broadcast without the express written prior permission of Audio Partnership PLC. Alteration or removal of any trademark, copyright, or other notice from this content is prohibited. Information provided in this document is provided solely for the use of official service agents in repairing and servicing Audio Partnership PLC products. 4 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print to A3 840A Block Diagram 5 Cambridge Audio Azur 840A Amplifier 6 15 12 16 17 2 9 10 1 3 15 11 6 8 5 7 4 18 5 14 13 To enhance viewing, please print to A3 840A Exploded Diagram 6 Cambridge Audio Azur 840A Amplifier Drawing Ref: 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 10 11 12 13 14 15 16 17 18 AP Part Number PY1118 PY1019 PY1020 PY1119 PY1120 PY1121 PY1123 PY1122 PY1124 PY1125 PY1126 PY1127 PY1128 PY1129 PY1130 PY1131 PY1132 PY1133 PY1135 PY1136 PY1138 PY1139 PY1159 PY1153 PY1146 PY1163 PY1155 PY1145 PY1137 PY1134 PY1165 Factory Ref: 2331-004909E301 3200-053044E000 3200-053045E000 3200-074051E001 3200-077811E000 6074-150003E000-01 6074-150003E001A01 6074-150004E000 6074-150004E000A01 6574-150009E000-01 6574-150009E000-02 6574-150013E000-01 6574-150013E000A01 8584-015010E301 6574-150012E000-01 6074-150005E000 6574-150015E000 3110-840000E000 6600-990112E000 2409-010200E001 9484-015000E041 9484-015000E341 9484-015000E141 9484-015000E091 9484-015001E091 9484-015000E331 9484-015000E071 9484-015000E111 9484-015000E061 9805-084000E001 Description Speaker Binding Post BP331 (Black) Red & Black Toroid 230V/50Hz 36.5VACx4 5.5A TI-053044C Toroid 115V/50Hz 36.5VAC 5.5A TI-0853045C for 840A Toroid 230V/50Hz 7.5VAC750MA 17VAC*2 TO7405B STB Toroid 115V/50Hz 7.5VAC750MA 17VAC*2 STB 840A Bass / Treble Knob (Black) Painted Black 840A Bass / Treble Knob (Silver) Painted Silver Azur 840A Plastic Foot (Black) AP16837* Azur 840A Plasitc Foot (Silver) AP16837* Azur 840A Top Panel Black Painted Azur 840A Top Panel Silver Azur 840A Side Panel, Black Painted Azur 840A Side Panel,Silver Azur 840A Black Front Panel Assy Azur-840A Silver Front Panel Assy Azur 840-A B Front Panel Artwork AP186371/186381 (Metalwork Only) Azur 840-A Silver Front Panel Artwork AP186371/186381 (Metalwork Only) Azur 840A Volume Knob Plastic Insert (AP1743*) Azur 840A Volume Knob Skin, Black Azur 840A Volume Knob Skin, Silver LCD Display Highly Transflective DC00003E02 840A Azur 840A Display Backlight (AP16841*) Rotary Encoder Switch REBG161(9*7)PVB20FHINB1-2-24E Azur-840A AMP-Hub Control PCB Assy Rev A Azur-840A Amp Input PCB Assy Rev A Azur-840A EU/UK PSU Power Control PCB Assy Rev A Azur-840A Main-Amp Left PCB Assy Rev A Azur-840A Main-Amp Right PCB Assy Rev A Azur-840A Pre-Amp Board Rev A Azur-840A Amp-Rectifier PCB Rev A Azur-840A Amp Front Control PCB Assy Rev A Azur-840A LCD Display Board Assy Rev A Azur-840A Remote Control Assy Rev A All spare parts should be ordered from AP Hong Kong office Exploded Diagram Parts List 7 Cambridge Audio Azur 840A Amplifier RS232 RX R9 22K RS232 RX +15V +5V R11 10K SERIAL RX 232 Q3 BC337 D3 1N4002 LOGIC GND R12 2K2 RS232 TX Q4 R13 22K SERIAL TX 232 BC337 LOGIC GND RS232 TX COL 1 SW1 SW-TACT INPUT 1 SW5 SW-TACT INPUT 5 SW9 SW-TACT MODE COL 2 SW2 SW-TACT INPUT 2 SW6 SW-TACT INPUT 6 SW10 SW-TACT ON/STBY COL 3 SW3 SW-TACT INPUT 3 SW7 SW-TACT INPUT 7 SW11 SW-TACT SPEAKER SELECT COL 4 SW4 SW-TACT INPUT 4 SW8 SW-TACT TAPE MON POSITION FOR EXTRA SWITCH spare ROW 1 SPEAKER TEST ROW 2 PHONES DETECT OVERLOAD CLIP DETECT DC OFFSET OVER TEMP MAINS FAIL ROW 3 +5V +15V C19 100n A ON/STBY LED D2 BLUE LED K C18 C21 C15 100n 100n 100pF LOGIC GND C16 C17 100pF 100n CN1 1 2 3 4 5 6 7 8 9 10 11 12 C22 FFC 12WAY CONNECTOR TO PREAMP PCB 100n +5V 1 CN2 2 1a 1 2a 2 3a 3 4a 4 5a 5 6a 6 7a 7 8a 8 15 16 CONN-8 DUAL BOT LCD DISPLAY CONN LED BACKLIGHT POWER R5 C20 100R 100nF +5V C2 100nF LOGIC GND C4 10U 16V LCD DECOUPLE LOGIC GND C7 100nF LOGIC GND SHIFT REG DECOUPLE RS +5V R14 10K SPEAKER TEST SHIFT REG ENABLE LCD DATA SHIFT REGISTER E C5 4 Q0 5 Q1 6 Q2 7 Q3 14 Q4 13 Q5 12 Q6 11 Q7 9 QS 10 QS 74HC4094 VDD=+5V VSS=LOGIC GND 2 D 3 CLK STB 1 15 OE U2 BC327-25 Q8 SERIAL DATA SERIAL CLOCK SHIFT REG ENABLE 22pF C6 X1 R15 10K CRYSTAL LOGIC GND 22pF FREQ=20MHz LOGIC GND +5V IR CONTROL BLOCK PIC TX SERIAL IN FROM A-BUS HUB BOARD HUB DATA HUB CLOCK R7 2K2 R2 R3 43R 1 2K2 CCW Vss 1 Vdd 2 Vo 3 RS 4 R/W 5 E 6 D0 7 D1 8 D2 9 D3 10 D4 11 D5 12 D6 13 D7 14 LED A 15 LED K 16 2 16 1 15 LCD CONN ORIENTATION FROM FRONT LOGIC GND PRESET 20K 3296W 2 R1 22R Q1 CW BC327-25 3 CW PR1 10U 16V R6 1K1 D8 C24 BZX79C2V7 500MW 1K1 R8 D4 1N4148 R4 4K7 D5 D6 Q2 1N4148 BC337 1N4148 PIC INPUT EMC CAPS LOGIC GND U1 1 MCLR/VPP 2 RB7/PGD 40 RA0/AN0 3 RB6/PGC 39 RA1/AN1 RB5 4 38 RA2/AN2 RB4 5 37 RA3/AN3/VREF 6 RB3/PGM 36 RA4/T0CKI 7 RA5/AN4/SS RB2 35 RB1 8 34 RE0/RD/AN5 RB0/INT 9 33 RE1/WR/AN6 10 VDD 32 RE2/CS/AN7 11 VDD VSS 31 RD7/PSP7 12 30 VSS RD6/PSP6 13 29 OSC1/CLKIN 14 RD5/PSP5 28 15 OSC2/CLKOUT RD4/PSP4 RCO/T1OSO/T1CKI RC7/RX/DT 27 16 RC1/T1OSI/CCP2 RC6/TX/CK 26 17 25 RC2/CCP1 RC5/SDO 18 24 RC3/SCK/SCL 19 RC4/SDI/SDA 23 RD0/PSP0 20 RD1/PSP1 RD3/PSP3 22 RD2/PSP2 21 PIC16F877A PORT B HAS WEAK PULLUPS RB4-RB7 HAS INTRPT ON CHANGE CLIP DETECT OVERLOAD OVER TEMP DC OFFSET MAINS FAIL PHONES DETECT SERIAL RX 232 SERIAL TX 232 SERIAL DATA SERIAL CLOCK SERIAL STROBE SERIAL CONTROL OUT IR IN (FROM RECEIVER ON PREAMP BOARD) +5V C10 R23 10R R24 10R ROT1 1 A SW 2 B SW 3 C GND 4 FIX1 5 FIX2 100n CER NOBLE16ENCODER C1 C3 10U 16V 100n C11 100n CER LOGIC GND FRONT PANEL GND LOGIC GND IR IN (FROM JACK & PHONO ON HUB PCB) PROGRAM_CLOCK PROGRAM_DATA MCLR HUB Programming Signals To ABUS Hub PIC PGM Q6 R19 BC337 10K LOGIC GND D7 1N4148 BC337 Q5 R17 10K 0 = BRIGHT TRISTATE= OFF 1= DIM R18 2K2 TRISTATE LED CONTROL 100N CERAMIC C23 P2 PAD P3 47R R16 PAD LOGIC GND FRONT PANEL GND FRONT PANEL GROUNDING 100N CERAMIC C9 RS232 TX RS232 RX 10R LOGIC GND PGM R10 MCLR HUB PROGRAM_DATA PROGRAM_CLOCK BLOCK PIC TX LOGIC GND HUB DATA HUB CLOCK 1 TX 2 RX 3 RS232 GND 4 IR IN 5 IR GND 6 7 8 CN3 9 10 11 12 13 FFC 13WAY RS232 & IR CABLE TO HUB PCB SERIAL IN FROM A-BUS HUB BOARD To enhance viewing, please printAtoPA136369/3 Front Panel PCB Schematic (Microcontroller & LCD) 8 Cambridge Audio Azur 840A Amplifier FROM SHEET 1 SERIAL DATA SERIAL CLOCK SERIAL STROBE SHIFT REG ENABLE +5V C8 100nF C12 100nF C13 100nF LOGIC GND SHIFT REG DECOUPLE C14 100nF U3 2D 3 CLK 1 STB 15 OE Q0 4 5 Q1 6 Q2 7 Q3 14 Q4 13 Q5 12 Q6 11 Q7 9 QS 10 QS 74HC4094 VDD=+5V VSS=LOGIC GND U4 2 D 3 CLK 1 STB 15 OE 4 Q0 5 Q1 Q2 6 Q3 7 14 Q4 13 Q5 Q6 12 Q7 11 9 QS QS 10 74HC4094 VDD=+5V VSS=LOGIC GND U5 2D 3 CLK 1 STB 15 OE Q0 4 5 Q1 6 Q2 Q3 7 Q4 14 13 Q5 12 Q6 11 Q7 9 QS 10 QS 74HC4094 VDD=+5V VSS=LOGIC GND CN4 1 2 3 4 5 6 7 8 FFC 08WAY TO PREAMP BOARD CN5 1 2 3 4 5 6 7 8 FFC 08WAY TO PREAMP BOARD CN6 1 2 3 4 5 6 7 8 FFC 08WAY TO PREAMP BOARD U6 2 D 3 CLK 1 STB 15 OE 4 Q0 5 Q1 6 Q2 Q3 7 14 Q4 13 Q5 Q6 12 Q7 11 9 QS QS 10 74HC4094 VDD=+5V VSS=LOGIC GND CN7 1 2 3 4 5 6 7 8 FFC 08WAY TO INPUT BOARD To enhance viewing, please print to A3AP16369/3 Front Panel PCB Schematic (Shift Registers) 9 Cambridge Audio Azur 840A Amplifier R13 C16 C17 R9 Q3 C9 Q4 C22 C21 Q6 R19 R12 C15 R15 D2 R14 SW10 U1 C18 C19 C14 C13 U2 U6 C3 U5 C12 U4 C8 U3 SW1 C1 X1 SW11 C7 C5 C6 SW9 SW2 SW3 SW4 C20 C4 CN2 R5 C2 SW5 SW6 SW7 SW8 (c) COPYRIGHT Audio Partnership PLC 2005 AP16370/3 AP16370/3 Q1 R1 R6 C24 R8 D4 Q5 R2 Q8 R3 R7 D8 R4 D7 R17 Q2 C10 C11 D5 D6 R18 P3 ROT1 P2 R24 R23 D3 R11 R10 C23 R16 To enhance viewing, please print to A3 AP16369/3 Front Panel PCB Layout (Top Side) 10 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print to A3 AP16369/3 Front Panel PCB Layout (Bottom Side) 11 Cambridge Audio Azur 840A Amplifier Front Panel PCB BOM AP16372/5 AP No Value Description/Type Qty Component Ident Notes PY1100 PY219 PY214 PY1141 PY1142 PY1140 PY1138 PY043 RESISTORS 10R 22R 43R 47R 100R 1K1 2K2 4K7 10K 22K CAPACITORS 22pF 100pF 100nF 10uF SEMICONDUCTORS PIC16F877A - I/P 74HC4094 TRANSISTORS BC327-25 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 0.25 W 1% Metal Film 3 R10, R23, R24 1 R1 1 R2 1 R16 1 R5 2 R6, R8, 4 R3, R7, R12, R18, 1 R4 5 R11, R14, R15, R17, R19 2 R9, R13 Ceramic 50V 10% Pitch=5mm Ceramic 50V 10% Pitch=5mm Ceramic 50V 10% Pitch=5mm 16V Electrolytic Radial (Height =5.2mm) Pitch=2.5mm 2 C5, C6 2 C15, C16 C1, C2, C7, C8, C9, C10, C11, 17 C12-C14, C17 - C21, C22, C23 3 C3, C4, C24 Note: Low profile electrolytic PIC Flash Microcontroller 40 pin DIL Shift register 16 pin DIL 1 U1 5 U2 - U6 Contact Audio Partnership Service Department PNP Small Signal TO92 2 Q1, Q8 BC337-25 NPN Small Signal TO92 4 Q2, Q3, Q4, Q5 DIODES BLUE LED Blue LED 3mm UNI flat top 1 D2 1N4148 General purpose diode 4 D4,D5, D6,D7 BZX 79C -2V7 Zener diode 2V7 400mW 1 D8 400mW DO 35 C ase. 1N4002 General Purpose Rectifier 1 D3 MISCELLANEOUS D100-SSV-12 12-WAY FFC reverse-needle type, single-row contacts 1 CN1 D100-SSV-13 13-WAY FFC reverse-needle type, single-row contacts 1 CN3 8-WAY FFC FRONT-PREAMP D100-SSV-08 CONNS, reverse-needle type single- 4 CN4, CN5, CN6, CN7 row contacts REB161(9x7)PVB20FHIN Noble ROTARY ENCODER B 1-2-24E 1 ROT1 2400-020200-000 T act switch 11 SW1-SW11 20MHz C RYST AL HC 49/4H 1 X1 MULTITURN PRESET 20K Side adjust. Foot print 9.5 x 4.5 mm 1 PR1 Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 12 Cambridge Audio Azur 840A Amplifier C6 22pF R60 10K U14:B INPUT 1 L- R57 20K NE5532 6 R3 7 INPUT 1 L+ 5 47R INPUT 1 CN1:B 3 R58 20K R22 R59 100R 10K QUAD PHONO C5 22pF LEFT C77 10U 16V NP RL1:B 4 3 5 RELAY HUB 1L INPUT 2 CN1:D 6 QUAD PHONO C39 R4 10U NP 35V R1 220K 1K C24 47pF 6 5 R45 100K U3:B C40 7 NE5532 10U 16V NP R44 47K RL2:B 4 3 5 RELAY HUB 2L INPUT 3 CN2:B 3 QUAD PHONO C41 R5 10U NP 35V R2 220K 1K C23 47pF 6 5 R47 100K U5:B C42 7 NE5532 10U 16V NP R46 47K RL3:B 4 3 5 RELAY HUB 3L INPUT 1 R+ INPUT 1 R- INPUT 1 L+ INPUT 1 L- CN10 1 INPUT ONE RIGHT + 2 INPUT ONE RIGHT - 3 GND 4 GND 5 INPUT ONE LEFT + 6 INPUT ONE LEFT - JST 2,5MM B6B-XH-A INPUT 1 R- INPUT 1 R+ INPUT 1 CN1:A 2 1 QUAD PHONO INPUT 2 CN1:C 5 4 QUAD PHONO C7 22pF R63 10K RIGHT -15V R61 20K 2 R62 20K R34 100R 3 22pF R64 10K C8 8 4 U14:A NE5532 1 R14 47R C4 100nF +15V C71 10U 16V NP RL1:C 7 6 8 RELAY HUB 1R -15V C38 R15 1K 10U NP 35V R12 C32 220K 47pF 2 3 R42 100k 8 4 U3:A NE5532 1 C37 10U 16V NP C43 47N PE 63V R43 47K RL2:C 7 6 8 RELAY HUB 2R +15V INPUT 3 CN2:A 2 1 QUAD PHONO C36 R16 1K 10U NP 35V R13 C27 220K 47pF 2 3 R40 100K 8 4 U5:A NE5532 1 -15V C35 10U 16V NP C44 47N PE 63V R41 47K +15V RL3:C 7 6 8 RELAY HUB 3R GROUND TERMINAL J1 TERMINAL P1 PAD C3 100nF 100V R23 100R C72 100nF 100V R85 100R INPUT 4 CN2:D 6 QUAD PHONO C45 R8 10U NP 35V R6 220K 1K C22 47pF 6 5 R66 100K U6:B C48 7 NE5532 10U 16V NP R55 47K RL4:B 4 3 5 RELAY HUB 4L INPUT 5 CN3:B 3 QUAD PHONO C46 R10 10U NP 35V R7 220K 1K C15 47pF 6 5 R67 100K U7:B C49 7 NE5532 10U 16V NP R56 47K RL5:B 4 3 5 RELAY HUB 5L INPUT 6 CN3:D 6 QUAD PHONO C47 R31 10U NP 35V R30 220K 1K C14 47pF 6 5 R68 100K U8:B C50 7 NE5532 10U 16V NP R65 47K RL6:B 4 3 5 RELAY HUB 6L INPUT 7 CN4:B 3 QUAD PHONO C60 R33 10U NP 35V R32 220K 1K C13 47pF 6 5 R76 100K U18:B C61 7 NE5532 10U 16V NP R77 47K RL7:B 4 3 5 RELAY HUB 7L TAPE RETURN LEFT CN4:D C69 R36 6 QUAD PHONO 1K 10U NP 35V R24 C31 220K 47pF TAPE OUT L CN5:B 3 QUAD PHONO U9:B NE5532 6 7 5 R81 100K C68 10U 16V NP R82 47K R9 100R TAPE RETN L -15V C34 RL8:B 4 3 5 RELAY 47N PE 63V U2:A NE5532 1 C33 8 4 C11 10U 16V NP 2 3 +15V R35 100K 47N PE 63V INPUT L INPUT 4 CN2:C 5 4 QUAD PHONO C51 R17 1K 10U NP 35V R20 C25 220K 47pF INPUT 5 CN3:A 2 1 QUAD PHONO C52 R18 1K 10U NP 35V R21 C26 220K 47pF INPUT 6 CN3:C 5 4 QUAD PHONO C53 R26 1K 10U NP 35V R28 C28 220K 47pF INPUT 7 CN4:A 2 1 QUAD PHONO C62 R27 1K 10U NP 35V R29 C29 220K 47pF TAPE RETURN R CN4:C 5 4 QUAD PHONO C70 R37 10U NP 35V R25 220K 1K C30 47pF TAPE OUT R CN5:A 2 1 QUAD PHONO 2 3 R69 100K 8 4 U6:A NE5532 1 -15V C57 10U 16V NP C54 47N PE 63V +15V R72 47K RL4:C 7 6 8 RELAY HUB 4R 2 3 R70 100K 8 4 U7:A NE5532 1 -15V C58 10U 16V NP C55 47N PE 63V R73 47K +15V RL5:C 7 6 8 RELAY HUB 5R 2 3 R71 100K 8 4 U8:A NE5532 1 -15V C59 10U 16V NP C56 47N PE 63V R74 47K +15V RL6:C 7 6 8 RELAY HUB 6R 2 3 R78 100K 8 4 U18:A NE5532 1 -15V C63 10U 16V NP C64 47N PE 63V R79 47K +15V RL7:C 7 6 8 RELAY HUB 7R 2 3 R75 100K 8 4 U9:A NE5532 1 -15V C66 10U 16V NP C67 47N PE 63V R80 47K TAPE RETN R -15V 47N PE 63V C16 +15V U4:A 4 R19 100R NE5532 2 1 3 C17 8 +15V RL8:C 7 6 8 RELAY C12 10U 16V NP R38 100K 47N PE 63V HUB 1L HUB 2L HUB 3L HUB 4L HUB 5L HUB 6L HUB 7L TAPE RETN L HUB IN L -15V C1 +15V C2 100n CER U1 1 Vss 2 L-S1 3 L-S2 4 L-S3 5 L-COM1 6 L-S4 7 L-S5 8 L-S6 9 L-COM2 10 L-S7 11 L-S8 12 L-COM3 13 ST 14 GND TC9163 100n CER Vdd 28 R-S1 27 R-S2 26 R-S3 25 R-COM1 24 R-S4 23 R-S5 22 R-S6 21 R-COM2 20 R-S7 19 R-S8 18 R-COM3 17 DATA 16 CLK 15 HUB INPUT SWITCHER HUB 1R HUB 2R HUB 3R HUB 4R HUB 5R HUB 6R HUB 7R TAPE RETN R HUB IN R LOGIC GND HUB IN L +5V CN6 1 2 HUB IN L HUB IN R GND 3 GND 4 5 +5V POWER TO HUB 6 7 8 9 10 SWITCHER DATA SWITCHER CLOCK SWITCHER STROBE FFC 10WAY INPUT PCB - HUB PCB INPUT R PREAMP OUT CN5:D 6 QUAD PHONO PREAMP OUT CN5:C 5 4 QUAD PHONO PREAMP OUT L PREAMP OUT R To enhance viewing, please print to A3 AP16361/3 Input PCB Schematic (Input Select) 13 Cambridge Audio Azur 840A Amplifier INPUT PCB - PREAMP PCB CN9 1 2 3 4 5 6 TO PREAMP LEFT TO PREAMP RIGHT PREAMP OUT L PREAMP OUT R JST 2,5MM B6B-XH-A CN7 1 2 3 4 5 6 7 8 FFC 08WAY +5V +9V +15V -15V LOGIC GND +9V +5V C65 100nF 100V LOGIC GND RL1:A 1 2 RELAY INPUT 1 CN8 1 2 3 4 5 6 7 8 FFC 08WAY FROM FRONT PANEL PCB U16 1 IN1 2 IN2 3 IN3 4 IN4 5 IN5 6 IN6 7 IN7 8 GND OUT1 16 OUT2 15 OUT3 14 OUT4 13 OUT5 12 OUT6 11 OUT7 10 COM 9 ULN2003A LOGIC GND +9V RL2:A 1 2 RELAY INPUT 2 RL3:A 1 2 RELAY INPUT 3 RL4:A 1 2 RELAY INPUT 4 RL5:A 1 2 RELAY INPUT 5 RL6:A 1 2 RELAY INPUT 6 RL7:A 1 2 RELAY INPUT 7 R11 10K D1 1N4001 TAPE MONITOR RL8:A 1 2 RELAY Q1 BC337 LOGIC GND To enhance viewing, please print to A3 AP16361/3 Input PCB Schematic (Input Control) 14 Cambridge Audio Azur 840A Amplifier +15V C21 INPUT L 5 10U 16V NP 6 R39 R54 100K 100K U2:B 7 NE5532 -15V C9 R83 R48 1k 47R 1000uF 10V EL C18 22p R49 1k TO PREAMP LEFT INPUT AMPLIFIER + 6 dB +15V INPUT R C20 5 10U 16V NP 6 R53 R52 100K 100K U4:B 7 NE5532 -15V C10 R84 47R 1000uF 10V EL R50 1k C19 22p R51 1k TO PREAMP RIGHT D2 1N4001 To enhance viewing, please print to A3 AP16361/3 Input PCB Schematic (Input Amplifier) 15 R64 Cambridge Audio Azur 840A Amplifier C21 C71 AP16362/3 AP16362/3 C3 J1 R23 To enhance viewing, please print to A3 AP16361/3 Input Board PCB Board Layout (Top Side) TO HUB PCB CN6 TO PREAMP PCB CN11 CN7 R57 R58 CN10 C65 Q1 CN8 FROM FRONT PANEL PCB RL1 R11 D1 R43 R42 U16 R14 R61 R62 R59 L C7 R63 U14 C4 R60 C6 C5 C77 R3 C32 R12 R15 C38 U3 C8 R R22 R R34 INPUT 1 C37 C40 RL2 C43 RELAY DRIVER LOGIC U1 HUB SWITCHER C1 C2 RL4 RL3 R45 R44 R41 R40 R47 R46 R72 R69 R66 R70 CN1 CN2 R L R4 C39 C27C24 R1 R13 INPUT 2 INPUT 3 R16 C36 C35 C42 U5 C44 L C23 R5 C41 C25 R20 R2 R R17 C51 C57 C48 U6 C54 R8 C45 L R R55 R73 CC2226R21 R6 R18 C52 INPUT 4 INPUT 5 C58 C49 RL5 RL6 R67 R56 R74 R71 R68 R65 R79 R78 R76 R77 U7 C55 C46 R L R10 C15 R7 C28 R28 R26 C53 C59 C50 U8 C56 CN3 CN4 L R R31 C47 C14 C29 R30 R29 INPUT 6 INPUT 7 R27 C62 C63 C61 U18 C64 L R33 C60 C13 R32 R25 C30 R37 R RL7 C70 C69 RL8 R36 C31 R24 R75 L TAPE RETURN C66 C72 R TAPE OUT C67 C17 R80 U9 R82 R85 C12 L CN5 C68 C16 R PREAMP L OUT R38 R81 C33 U4 R19 R50 C19 R52 C20 R51 R53 R35 R84 R9 R48 U2 P1 C11 C10 C9 C34 C18 R54 R49 R39 CN9 TO PREAMP PCB R83 CN9 16 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print to AA3 P16361/3 Input Board PCB Board Layout (Bottom Side) 17 Cambridge Audio Azur 840A Amplifier Input PCB BOM AP No V alue RESISTORS 47R 100R 1K 10K 20K 47K D escr iption/T ype 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 100K 0.125 W Metal Film 220K CAPACITORS 22pF 47pF 47nF 100nF 10uF 10uF 1000uF PY476 PY1162 PY1158 PY214 SEMICONDUCTORS T C 9163AF NE5532 ULN 2003A TRANSISTORS BC 337-25 DIODES 1N 4001 MISCELLANEOUS Q UAD PHO N O SO C KET JST 2.5MM B6B-X H-A 0.125 W Metal Film C eramic 50V 10% Pitch= 3mm C eramic 50V 10% Pitch= 3mm 63V 10% Polyester Pitch= 5mm C eramic 50V 10% Pitch= 5mm 16V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm 35V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm 10V Electrolytic Radial (10mm) Pitch= 5mm Analogue Switch Array Low Noise Dual Audio Op-Amp (SMT) 7 Darlington Drivers N PN Small Signal D iode PHO N O Vertical header PY1140 FFC 8-WAY D 100-SSV-08 PY1143 FFC 10-WAY RELAY ME-2-9 9V DC D 100-SSV-10 Qty C omponent Ident AP16364/3 N otes 4 R3, R14, R83, R84 6 R9, R19, R22, R23, R34, R85 R4, R5, R8, R10, R15-R18, R26, R27, 18 R31, R33, R36, R37, R48-R51 5 R11, R59, R60, R63, R64 4 R57, R58, R61, R62 R41, R43, R44, R46, R55, R56, R65, 13 R72-R74, R77, R79, R80, R82 R35, R38-R40, R42, R45, R47, R5220 R54, R66-R71, R75, R76, R78, R81 R1, R2, R6, R7, R12, R13, R20, R21, 14 R24, R25, R28-R30, R32 6 C 5-C 8, C 18, C 19 14 C 13-C 15, C 22-C 32 C16, C17, C33, C34, C43, C44, C54 11 C56, C64, C67 6 C 1, C 2, C 4, C 3, C 65, C 72 C11, C12, C20, C21, C35, C37 C40, 20 C42, C48-C50, C57-C59, C61, C63, C66, C68, C71, C77 C36, C38, C39, C41, C45-C47, C5114 C53, C60, C62, C69, C70 2 C9, C10 1 U1 10 U3, U5-U9, U18, U2, U4, U14 1 U16 1 Q1 1 D1 5 C N 1-C N 5 2 C N 9, C N 10 2 C N 7, C N 8 1 CN6 8 RL1-RL8 SO P28 Package SO8 Package DIL16 Package T O 92 Package DO 41 Input 1 audio conn, i/o conn Vertical FFC conn, reverse-needle type Vertical FFC conn, reverse-needle type Note: resistors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 18 Cambridge Audio Azur 840A Amplifier A CABLE C CABLE INPUT PCB - PREAMP PCB FRONT PCB - PREAMP PCB +15V CN11 CN2 1 2 3 4 5 6 7 8 CONN FFC-8 +5V +9V +15V -15V LOGIC GND 1 2 3 4 5 6 7 8 9 10 11 12 CONN FFC-12 +5V SPEAKER TEST ON/STBY LED PHONES DETECT OVERLOAD CLIP DETECT DC OFFSET OVERTEMP MAINS FAIL IR RX LOGIC GND IR RX +9V +5V R104 47R U10 OPT 1 GND 2 3 +5V TSOP18 IR RX IR RECEIVER TSOP1836/37 LOGIC GND C19 100n ceramic C20 10U 16V SHIFT REGISTER CONNECTOR FROM FRONT PANEL PCB CN6 1 2 3 4 5 6 7 8 CONN-H8 SHIFT REGISTER CONNECTOR FROM FRONT PANEL PCB CN8 1 2 3 4 5 6 7 8 CONN-H8 U4 1 IN1 2 IN2 3 IN3 4 IN4 5 IN5 6 IN6 7 IN7 8 GND OUT1 16 OUT2 15 OUT3 14 OUT4 13 OUT5 12 OUT6 11 OUT7 10 COM 9 ULN2003A LOGIC GND U5 1 IN1 2 IN2 3 IN3 4 IN4 5 IN5 6 IN6 7 IN7 8 GND OUT1 16 OUT2 15 OUT3 14 OUT4 13 OUT5 12 OUT6 11 OUT7 10 COM 9 ULN2003A LOGIC GND RL1:A 1 RL2:A 1 2 RELAY VOL 1 LOW VOLUME 2 RELAY VOL 2 +9V +9V RL12:A 1 2 RELAY VOL 12 +9V RL3:A 1 2 RELAY VOL 3 RL13:A 1 2 RELAY VOL 13 RL4:A 1 2 RELAY VOL 4 RL5:A 1 2 RELAY VOL 5 RL14:A 1 RL15:A 1 2 RELAY VOL 14 HIGH VOLUME 2 RELAY BAL L RL6:A 1 2 RELAY VOL 6 RL16:A 1 2 RELAY BAL R RL7:A 1 2 RELAY VOL 7 RL17:A 1 2 RELAY BAL1 RL8:A 1 2 RELAY VOL 8 RL18:A 1 2 RELAY BAL 2 SHIFT REGISTER CONNECTOR FROM FRONT PANEL PCB CN9 1 2 3 4 5 6 7 8 CONN-H8 U7 1 IN1 2 IN2 3 IN3 4 IN4 5 IN5 6 IN6 7 IN7 8 GND OUT1 16 OUT2 15 OUT3 14 OUT4 13 OUT5 12 OUT6 11 OUT7 10 COM 9 ULN2003A LOGIC GND +9V +5V C27 LO = MAINS ON INRUSH RELAY C28 C29 XD ON/OFF OUTPUT RELAY A OUTPUT RELAY B LOGIC GND 100n ceramic 100n ceramic ULN2003 DECOUPLERS 100n ceramic R111 4K7 R100 22K MAINS ON/OFF RELAY R110 10K +5V R83 22K Q1 BC337 ON/STBY LED R21 R20 430R 430R Q2 ON/STBY LED CONTROL BC337 LOGIC GND RL9:A 1 2 RELAY VOL 9 RL10:A 1 2 RELAY VOL 10 RL11:A 1 2 RELAY VOL 11 RL19:A 1 2 RELAY BAL 3 +5V PHONES R PHONES L PHONES GND CN1 8 7 3 RSW1 RSW2 R 2 L 4 LSW2 5 LSW1 1 GND HEADPHONE JACK PHONES DETECT HI = PHONE JACK OUT R19 100K TIP = LEFT RING = RIGHT LOGIC GND To enhance viewing, please print to A3 AP16365/4 Preamp PCB Schematic (Relay Logic) 19 Cambridge Audio Azur 840A Amplifier C38 1N PE 63V TREBLE ALPHA RD902PF 6 4 VR1:B 5 R3 C1 R2 1K1 1N5 PE 63V 1K1 C3 R5 R1 R4 2K2 4K7 2K2 10pF R15 5 2K2 6 4 BASS VR2:B ALPHA RD902PF 5 U1:B 7 6 CN3 1 2 3 4 5 6 C2 680n poly P1 GROUND REINFORCE PAD PREAMP OUT L PREAMP OUT R NE5532 TONE CONTROL JST 2,5MM B6B-XH-A C39 TREBLE 1N PE 63V ALPHA RD902PF 3 1 VR1:A R8 1K1 2 R7 1K1 C4 1N5 PE 63V C6 R10 R6 R9 2K2 4K7 2K2 +15V 10p C13 R17 ALPHA RD902PF 3 1 BASS VR2:A C5 680n poly 2 2K2 47N PE 63V 8 U2:A 3 1 2 NE5532 4 C14 47N PE 63V -15V +15V C9 470U 10V EL R11 47k C8 SW1:A SW-DPDT DEFEAT 47N PE 63V C36 100pF 2K2 R16 8 4 3 1 2 NE5532 U1:A C10 470U 10V EL R13 47k R97 150R R22 150R RL17:B 4 3 5 RELAY R85 390R R105 R87 2K2 2K2 RL18:B 4 3 5 RELAY R88 1K R86 390R RL15:C 7 6 8 RELAY RL15:B C18 4 3 5 RELAY 10U NP 16V 5 RL19:B 6 4 3 5 RELAY R99 47K LEFT U9:B NE5532 7 C21 TO VOLUME LEFT 1000U 10V EL R103 47K R89 2K2 2.5 dB 3.75 dB 5.5 dB -15V BALANCE CONTROL BALANCE BUFFER C37 C11 470U 10V EL R12 47k SW1:B SW-DPDT DEFEAT 100pF R18 2K2 5 U2:B 7 6 NE5532 C12 470U 10V EL R14 47k R98 150R RL17:C 7 6 8 RELAY R90 R96 150R 390R +15V RL18:C 7 6 8 RELAY R94 1K R92 390R RL19:C 7 8 RELAY RL16:C 7 6 8 RELAY RL16:B 4 3 5 RELAY 6 RIGHT C24 10U NP 16V 3 2 R101 47K -15V 4 8 C15 47N PE 63V U9:A 1 C25 TO VOLUME RIGHT NE5532 1000U 10V EL R102 47K C22 47N PE 63V R91 R93 R95 2K2 2K2 2K2 To enhance viewing, please print to A3 AP16365/4 Preamp PCB Schematic (Tone Control) 20 Cambridge Audio Azur 840A Amplifier C35 47N PE 63V +15V C23 100nF ceramic C31 47U NP 25V R106 470R R107 47K 8 C16 VOL OUT LEFT 10U NP 16V -15V 3 2 R77 47K 4 U12:A 1 NE5532 P2 PAD GROUND REINFORCE P3 PAD R76 390R POST AMPLIFIER 390R R75 -15V C33 18 pF C34 15 pF R81 220R 100nF ceramic C26 HI = NORMAL OVERTEMP HI = NORMAL DC OFFSET HI = NORMAL OVERLOAD HI = NORMAL CLIP DETECT D3 5V1 VOL OUT RIGHT C17 10U NP 16V R80 47K U12:B 5 7 6 NE5532 R78 390R R79 390R LO = ON XD ON/OFF R82 220R C32 47U NP 25V R108 470R R109 47K PREAMP OUT L R84 47K D1 1N4148 D2 1N4148 LOGIC GND PREAMP OUT R CN10 1 AUDIO TO L POWER AMP 2 JST 2.5MM B2B-XH-A PREAMP PCB - POWER AMP LEFT PCB CONNS +9V +5V LOGIC GND SPEAKER TEST MAINS FAIL OUTPUT RELAY A OUTPUT RELAY B PHONES R PHONES L PHONES GND CN4 1 2 3 4 SPEAKER TEST 5 CLIP 6 OVERLOAD 7 DC OFFSET 8 OVERTEMP 9 XD ON/OFF 10 11 12 13 14 15 16 FFC 16WAY C30 10u 25V +15V C7 10u 25V -15V OPAMP DECOUPLING +9V +5V LOGIC GND MAINS FAIL IN MAINS FAIL IN MAINS ON/OFF RELAY INRUSH RELAY CN5 1 2 3 4 5 6 7 8 9 10 11 12 FFC 12WAY CN12 1 2 AUDIO TO R POWER AMP JST 2.5MM B2B-XH-A PREAMP PCB - PSU PCB CONN PREAMP PCB - POWER AMP RIGHT PCB CONN To enhance viewing, please print to A3 AP16365/4 Preamp PCB Schematic (Post Amp) 21 Cambridge Audio Azur 840A Amplifier R82 R81 R100 R110 Q1 Q2 R83 R20 R21 R111 R19 C23 R104 R108 CN4 P1 R106 R107 R109 D1 CN3 C32 C31 D2 R84 D3 CN11 CN12 CN10 CN2 C26 CN1 PHONES C16 C33 R77 C35 R76 R75 R23 RL1 RL2 RL3 RL4 RL5 RL6 RL7 R51 R49 R27 R25 R56 R55 R31 R32 R58 R57 R24 R50 C34 R26 R52 U12 R78 R79 R80 C17 R28 R54 R53 C19 R29 R30 C20 U10 R33 R59 R34 R35 R61 R60 C28 U4 RL8 RL9 RL10 RL11 RL12 RL13 RL14 U5 C2 CN6 CN8 R36 R37 R63 R62 R38 R39 R65 R64 R40 R66 R41 R42 R67 R68 R43 R44 R70 C27 C7 C30 C11 C9 R102 R71 R46 R72 P2 U1 R69R45 R48 R74 R47 R73 C10 C8 C36 R13 C25 R103 C21 R15 R16 C3 R9 R4 C5 VR2 R5 R10 R1 R7 C4 R2 CN5 RL17 RL18 RL19 RL16 RL15 U7 C1 VR1 R3 C38 R11 P3 SW1 R12 R91 R90 R98 R85 R87 R18 R17 C13 R101 R92 R94 C24 C18 C22 R99 C29 CN9 R8 U9 R97R22R105 C14 R93 R96 R88 R86 R89 R95 C6 C12 R6 C39 C15 U2 R14 C37 To enhance viewing, please print to A3 AP16365/3 Preamp PCB Layout (Top Side) 22 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print to A3 AP16365/3 Pre-amp PCB Layout (Bottom Side) 23 Cambridge Audio Azur 840A Amplifier Preamp PCB BOM AP16368/4 AP No Value Description/Type Qty Component Ident Notes PY259 PY1158 PY214 RESISTORS 5R1 51R 150R 300R 390R 620R 1K 1K1 1K2 2K2 4K7 5K1 10K 20K 39K 47K 75K 82K 160K 200K 300K 620K 820K 1M2 5M1 47R 430R 470R 10K 22K 47K 100K CAPACITORS 10pF 15pF 18pF 100pF 1nF 1n5 47nF 100nF 680nF 10uF 10uF 10uF 47uF 470uF 1000uF SEMICONDUCTORS NE5532 T SO P18 IR RX ULN 2003A TRANSISTORS BC 337-25 DIODES 1N 4148 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 2 R47, R73 2 R48, R74 4 R22, R90, R97, R98 2 R44, R70 R85, R86, R92, R96, R75, R78, R76, 8 R79 2 R46, R72 4 R37, R63, R88, R94 4 R2, R3, R7, R8 2 R45, R71 R4, R5, R9, R10, R15-R18, R43, R69, 10 R87, R89, R91, R93, R95, R105 3 R1, R6, R111 2 R35, R61 11 R38-R42, R64-R68 4 R30, R32, R56, R58 2 R36, R62 R11-R14, R77, R80, R99, R101, R102, 9 R103, 2 R34, R60 2 R28, R54 2 R33, R59 2 R24, R50 2 R31, R57 2 R29, R55 2 R26, R52 4 R25, R27, R51, R53 2 R23, R49 3 R81, R82, R104 2 R20, R21 2 R106, R108 1 R110 2 R83, R100 3 R84, R107, R109 1 R19 C eramic 50V 10% Pitch= 3mm 2 C 3, C 6 C eramic 50V 10% Pitch= 3mm 1 C 34 C eramic 50V 10% Pitch= 3mm 1 C 33 Ceramic 50V 10% Pitch=3mm 2 C36, C37 Polyester 63V 10% Pitch=5mm 2 C38, C39 Polyester 63V 10% Pitch=5mm 2 C1, C4 63V 10% Polyester Pitch= 5mm 6 C 8, C 13, C 14, C 15, C 22, C 35 Ceramic 50V 10% Pitch= 5mm 6 C19, C23, C26-C29 Polyester 100V 5% Pitch= 15mm 2 C2, C5 25V Electrolytic Radial (5mm) Pitch= 2.5mm 2 C7, C30 16V Electrolytic Radial (5.2mm) Pitch= 1 C20 2.5mm 16V Electrolytic NP Radial (5.2mm) Pitch= 2.5mm 4 C16, C17, C18,C24, 25V Electrolytic NP Radial (8.4mm) Pitch= 3.5mm 2 C31, C32 10V Electrolytic Radial (8.4mm) Pitch= 4 C9-C12 3.5mm 10V Electrolytic Radial (10.4mm) Pitch= 5mm 2 C21, C25 Low Noise Dual Audio Op-Amp IR Receiver Module 7 Darlington Drivers 4 U1, U2, U9, U12 1 U10 3 U4, U5, U7 DIL08 Package Replaces T SO P18 DIL16 Package 2 Q 1, Q 2 T O 92 Small Signal Diode 2 D1, D2 Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 24 Cambridge Audio Azur 840A Amplifier Preamp PCB BOM AP No Value Description/Type Qty Component Ident BZX 79-C 5V1 MISCELLANEOUS Zener diode 5V1 400mW 1 D3 PY1156 RD902PF-20B6-30F-B5K-0C ALPHA B5K LINEAR POT 2 VR1, VR2 PY1141 CK-6.35-04 7P JST 2,5MM B2B-XH-A JST 2,5MM B6B-XH-A D100-SSV-12 PY1140 D100-SSV-08 PY1157 PY645 D100-SSV-16 ME-2-9 9V DC Push switch -DPDT HEADPHONE JACK SKT 2-way vertical header 6-way vertical header Flat-film connector 12-way, reverseneedle type Single row contacts Flat-film connector 8-way, reverseneedle type Single row contacts Flat-film connector 16-way, reverseneedle type Single row contacts 9V DC Relay 2402-020200-010 1 CN1 2 CN10, CN12 1 CN3 2 CN2, CN5 4 CN6, CN8, CN9, CN11 1 CN4 19 RL1-RL19 1 SW1 AP16368/4 Notes 400mW DO 35 C ase. Retractable 9mm pot. With centre detent. As used in 340A Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 25 Cambridge Audio Azur 840A Amplifier MAINS IN J24 BROWN LIVE 10A for 115V 6A3 for 230V F1 T6A3 AL LVD! MAINS ON/OFF RELAY C30 X1 10n RL3:B 4/5 3/6 ME14FW009HS INRUSH CONTROL RELAY C29 X1 10n RL4:B 4/5 3/6 ME14FW009HS R78 10R 10W WW TO MAIN TRANSFORMER J2 1 BROWN/BLACK LIVE C13 C23 X2 470N SUPPRESSION X2 470N SUPPRESSION ALTERNATIVE POSITIONS FOR X-CAPS WITH DIFFERENT LEAD PITCHES CN2 +15V 1 2 -15V 3 4 0V 5 6 +9V 7 8 MAINS FAIL IN 9 10 MAINS ON/OFF 11 INRUSH 12 FFC 12WAY +15V -15V +9V PSU D25 MAINS ON/OFFD9 2 INRUSH CONTROL 2 PSU GND +5V PSU 1N4001 PSU GND 1 ME14FW009HS 1N4001 RL3:A 1 ME14FW009HS RL4:A R87 D24 AC 47K 1N4002 MAINS FAIL RECTIFIER C28 4U7 50V R79 4K7 PSU PCB PSU GND J27 BROWN NEUTRAL J26 BROWN NEUTRAL J1 2 BLUE/WHITE NEUTRAL J8 1 TERMINAL J9 2 TERMINAL NEUTRAL MAIN TRANSFORMER BROWN 230 V Primary BLUE 0 V 117 DEG C STANDBY TRANSFORMER BROWN 230 V Primary BLUE 0 V 113 DEG C MAINS IN CN3 N E L IEC-SOC CHASSIS GND C11 X1 10n GROUND C12 X1 10n J25 BROWN LIVE MAINS SWITCH ON REAR PANEL RED 5.5A 1 36 V ORANGE Secondary YELLOW 5.5A 2 0V TO POWER AMP SUPPLY LEFT (SEPARATE PCB) 3 36 V GREEN 100 mA RED 5.5A 4 38 V 1 36 V ORANGE 2 0V Secondary YELLOW 5.5A 3 36 V GREEN 100 mA 4 38 V J13 TERMINAL GREEN J10 +48V IN TERMINAL RED FROM RECTIFIER BOARD J11 0V IN TERMINAL BLACK F7 T1A AL LVD! J12 -48V IN TERMINAL ORANGE D23 1N4002 +48V R C25 15000uF-63V C26 15000uF-63V POWER AMP SUPPLY RIGHT C27 1000uF-50V -48V R R88 33R 1W C17 220uF 100V -51V R RED 500mA Secondary 1 ORANGE 1 7.5 V 2 0V J6 TERMINAL F4 20MM T1AL J7 TERMINAL C34 X1 10n D19 1N4002 D21 1N4002 D20 1N4002 D22 1N4002 AC 4700u 16V C24 RELAY SUPPLY 7805 MICROCONTROLLER SUPPLY 1 VI VO 3 +5V PSU 2 GND C20 100nF ceramic U2 C16 47u 16V R95 2R2 0.5W +9V PSU C33 C31 100nF ceramic PSU GND 4700u 16V YELLOW 100mA 3 17 V GREEN Secondary 2 VIOLET 100mA 4 0V 5 17 V J3 TERMINAL BLACK J5 F2 20MM T1AL TERMINAL GREY J4 TERMINAL GREEN F3 20MM T1AL C37 C35 X1 10n X1 10n D15 1N4002 C36 X1 10n D17 1N4002 D16 1N4002 D18 1N4002 U3 7815 1 VI C14 1000U 35V EL GND C32 OPAMP SUPPLY 100nF ceramic VO 3 +15V C18 100u 25V 2 C15 470u 35V 2 VI U4 7915 1 GND 3 VO C22 100nF ceramic C19 100u 25V PSU GND -15V PSU PCB +5V IN MAINS FAIL IN R96 R81 100K 33K +310 mV +600 mV R80 2K2 R77 10K 5 7 6 U1:B LM393 LOW = NORMAL MAINS FAIL TO SHEET 1 MAINS FAIL DETECT To enhance viewing, pleaAsePp1rin6t3to7A33/4 Power Amplifier (Right) Power Supplies & PSU PCB Schematic 26 Cambridge Audio Azur 840A Amplifier +48V R R2 100R Q3 MPSA93 C8 47uF 16V R56 2K2 C7 47uF 35V D10 1N4148 D11 1N4148 R57 22K R3 68R Q4 MPSA93 R10 1K8 AMP IN RIGHT JST 2.5MM B2B-XH-A CN4 C1 1 2 47U 16V R4 100R Q5 MPSA93 R5 100R Q6 MPSA93 R67 22K R27 2K2 NFB-R R11 1K2 3 R13 +48V R 2K2 C41 R14 100R VR1 2 1K 1 R97 100K 4n7 COG C6 1000U 10V EL D30 1N4148 D31 1N4148 1 3 VR2 R99 2 1K 10K C38 10U NP 16V -48V R R98 100K DC OFFSET NULL R100 22K Q7 MPSA43 R6 68R CHASSIS GND C39 100pF Q8 MPSA43 R7 68R Q11 BC337 D34 1N4148 C10 Q9 MPSA43 100pF R15 22K R8 R89 2K2 10K R91 R18 75K 100R R12 18R Q12 MJE340 R17 100R D2 1N4148 Q19 MPSA43 C9 47uF 16V Q1 MJE340 R54 R1 16K 10R 2K7 R93 R33 3K3 R52 1K D28 12V NFB-R R21 0R1 Q20 MPSA93 D1 1N4148 R53 1K R94 2K7 16K R55 D29 12V R34 3K6 R32 10R D32 1N4148 R23 100R D33 1N4148 Q2 MJE350 R92 56K R24 100R R22 0R1 Q15 2SC3264 Q10 MPSA43 R49 16K R9 56R Q25 MPSA43 R51 R90 10K 47K R19 0R1 Q13 2SA1295 R20 0R1 Q14 2SA1295 R64 10K Q16 2SC3264 R25 R26 0R1 0R1 R63 1K Q26 MPSA43 R84 10K R66 47K R62 150R Q27 MPSA93 D12 1N4148 D13 1N4148 R65 47K R60 R61 1K1 1K1 Q29 MPSA93 Q28 MPSA93 R30 470R Q17 Q18 MJE340 2SA1295 R31 0R68 R58 R59 470R 470R -51V R C21 100nF ceramic +5V IN R68 R69 4K7 10K +850mV 3 2 TH1 ZPP22 100DEG POSITIVE THERMISTOR 850R at 100degC R70 1K8 4 8 R71 1M U1:A 1 LM393 HI = NORMAL R74 4K7 OVERTEMP DETECT 100deg C cutout BC337 MPSA43/93 OVERTEMP +5V IN CN1 +5V 1 LOGIC GND 2 SPEAKER TEST SENSE 3 +9V 4 OVERLOAD 5 CLIP 6 OVERTEMP 7 DC OFFSET 8 MAINS FAIL 9 XD ON/OFF 10 OUTPUT RELAY B 11 OUTPUT RELAY A 12 MAINS FAIL IN 13 spare PHONES GND 14 15 PHONES R 16 LOGIC GND SPEAKER TEST SENSE CLIP DC OFFSET MAINS FAIL OUTPUT RELAY B OUTPUT RELAY A MAINS FAIL IN PHONES OUT RIGHT FFC 16WAY PREAMP PCB - POWER AMP PCB CONN XD ON/OFF +9V IN R86 47K R16 10K OUTPUT RELAY A LOW = NORMAL Q35 BC337 BC337 Q32 D14 1N4002 R72 4K7 Q31 BC337 RL1:A 2 1 RELAY OUTPUT RELAY B 1N4002 D7 R82 4K7 R85 10K 10K R75 BC337 Q34 Q33 BC337 LOGIC GND OUTPUT RELAY CONTROL C4 220uF 80V R40 220R 3W C R41 470R 1W C D26 1N5404 LEFT IN J22 +5V IN R101 1K R29 10R 3W L1 1,7U 10A R28 2R2 3W SPEAKER TEST SENSE C2 0u1 POLYESTER D27 1N5404 C5 220uF 80V PHONES OUT RIGHT RL1:C J18 8 6 LEFT OUT A 7 RELAY RL2:C J20 8 6 LEFT OUT B 7 RELAY RL1:B J14 5 3 RIGHT OUT A 4 RELAY R46 4K7 Q24 MPSA93 HI = NORMAL R48 22K CLIP R47 47K R45 47K -48V R RL2:B 5 3 4 RELAY J16 RIGHT OUT B J15 GND RIGHT J17 GND RIGHT D8 1N4148 R43 47K R44 47K Q23 MPSA43 R42 4K7 +48V R -48V R RL2:A 2 1 RELAY R50 10K R83 10K R39 10K R35 47K D4 1N4148 C3 22U 50V NP D3 1N4148 1N4148 D5 R37 100K Q21 MPSA43 10U 63V EL C40 Q22 MPSA93 D6 1N4148 R36 4K7 LOW = NORMAL Q36 10K BC337 R73 -48V R DC OFFSET DETECT HI = NORMAL DC OFFSET R38 47K R76 10K RIGHT E BC C BE To enhance viewing, please print to A3 AP16373/4 Power Amplifier Right Channel 27 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print toAAP316373/3 Power Amp (Right) & PSU PCB Layout (Top Side) 28 Cambridge Audio Azur 840A Amplifier To enhance viewing, please printAtoPA136373/3 Power Amp Right & PSU PCB Layout (Bottom Side) 29 Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM AP No V alue D escr iption/T ype Qty C omponent Ident N otes RESISTORS 910R 2K2 4K7 10K 22K 33K 47K 100K 1M 10R 18R 56R 68R 100R 150R 470R 1K 1K1 1K2 1K8 2K2 2K7 3K3 3K6 4K7 10K 16K 22K 47K 56K 75K 100K 33R 470R 0R1 1R5 2R2 10R 220R CAPACITORS 100pF 10nF X1 CAP 100nF 100nF 10uF 10uF 22uF 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 1 W Metal Film 1 W C arbon 3 W Wire Wound 3 W Wire Wound 3 W Wire Wound 3 W Wire Wound 3 W Carbon 1 R70 1 R80 5 R36 , R66, R68, R72, R74, 6 R16, R69, R75, R76, R77, R85, 1 R48 1 R81 2 R43, R90, 1 R96 1 R71 2 R1, R32 1 R12 1 R9 3 R3, R6, R7 9 R2, R4-R5, R14, R17, R18, R23, R24, 1 R62 3 R30, R58, R59 6 R52-R53, R63, R80, R99, R101 2 R60, R61 1 R11, 1 R10, 4 R8, R13, R27, R56, 2 R93, R94 1 R34 1 R33 3 R42, R46, R82 R39, R50, R51, R64, R73, R83, R84, , 8 R89, 3 R49, R54, R55 5 R15, R57, R67, R81, R100 R35, R38, R44, R45, R47, R65, R66, 8 R86 1 R92 1 R91 4 R37, , R97, R98 1 R88 Space off PCB 1 R41 Space off PCB 6 R19-R22, R25, R26 S pace off PCB 1 R31 Space off PCB 1 R28 Inductor damping res. No need to stand off PCB 1 R29 1 R40 Ceramic 100V 10% Pitch= 3mm MEX103K300A02 Pitch =10mm Ceramic 100V 10% Pitch= 5mm Polyester Pitch= 10mm 16V Electrolytic Radial Non Polarised (6.4mm) Pitch= 5mm 63V Electrolytic Radial (5mm diam) Pitch= 3.5mm 50V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm 1 C10, C39 3 C11, C12, C20 2 C18, C21 1 C2 2 C20, C38 1 C40 1 C3 AP16376/7 Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 30 Cambridge Audio Azur 840A Amplifier Power Amp Right PCB BOM AP16376/7 AP No V alue D escr iption/T ype Qty C omponent Ident N otes 47uF 47uF 220uF 220uF 1000uF 1000uF 15000uF SEMICONDUCTORS PY1152 LM393AP PY1148 PY1150 PY021 PY013 PY214 PY1149 PY1147 TRANSISTORS MJE340 MJE350 MPSA93 MPSA43 BC337-25 2SA1295 2SC 3264 DIODES 1N4148 1N4002 1N5404 BZX 79-C 12 MISCELLANEOUS Z P221A501E 08-1950100-150 MULTITURN PRESET 1K MULTITURN PRESET 10K SS-7B-1 PY1151 D100-SSV-16 4031-050100-001 T1A AL 16V Electrolytic Radial (5mm) Pitch= 2.5mm 35V Electrolytic Radial (10mm) Pitch= 2.5mm 100V Electrolytic Radial (12.5mm) Pitch= 5mm 80V Electrolytic Radial (10.4mm) Pitch= 5mm 10V Electrolytic Radial (10.4mm) Pitch= 5mm 50V Electrolytic Radial (13.4mm) Pitch= 5mm 63V Electrolytic Radial (35.4mm) Pitch= 10mm 3 C1, C8, C9 1 C7 1 C17 2 C4 1 C6 1 C27 2 C25, C26 Low-offset dual Comparator, A-version for low offset voltage 1 U1 DIL08 Package N PN Driver T ransistor PN P Driver T ransistor PNP Small Signal NPN Small Si gnal NPN Small Si gnal PNP Power Audio N PN Power Audio 3 Q 1, Q 12, Q 18 T O 126 1 Q2 T O 126 10 Q3-Q6, Q20, Q22, Q24, Q27-Q29 TO92WIDE 8 Q7-Q10, Q19, Q21, Q23, Q26, Q25, TO92WIDE 9 Q11, Q31-Q36 TO92 3 Q13, Q14, Q17 MT200 2 Q 15, Q 16 MT 200 MPSA92 ma MPSA42 ma y be used y be used Small Signal Diode General Purpose Rectifier General Purpose Rectifier 12V Zener diode 400mW D1-D6, D8, D10-D13, D17, D18, D30 18 D34 3 D7, D14, D23, 2 D26, D27 2 D28, D29 DIODE-IN4148 DO 41 Package DO 27 Package Clamp diodes 400mW DO 35 C ase. PO SIT IVE T HERMIST O R 1 TH1 1.7uH 10A INDUCTOR 1 L1 Top adjust. Footprint 9.5 x 4.5 mm Top adjust. Footprint 9.5 x 4.5 mm W ong Feng IEC-SOCKET FFC CONNECTOR 16WAY, Vertical "Reverse needle" type, Single row of contacts Fuseholder 20mm FUSE-20MM 1A anti sur ge, 1 VR1 1 VR2 1 CN3 1 CN1 1 F7 1 F7 N ominal operatingtemp 100 degC 10 turns of 1.5mm copper wire, diameter 20mm, length approx 20mm Set quiescent current. Insert so adj screw next to R17 DC trim Insert so adj screw next to Q11 WMZ12A( )-100S80FLS Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 31 Cambridge Audio Azur 840A Amplifier PSU PCB BOM AP No V alue D escr iption/T ype RESISTORS 2R2 10R 10W 8.5X53MM WireWound 4K7 47K CAPACITORS 10nF X1 Capacitor 100nF 470nF 4u7 47uF 100uF 470uF 1000uF 4700uF 0.5 W Metal Film KN 10W J 10O hm B 0.25 W Metal Film 0.25 W Metal Film MEX103K300A02 Pitch =10mm Ceramic 100V Pitch= 5mm X2 Suppression CAP BOX 27.5X13 Pitch= 27.5mm or BOX 22.5X10 Pitch= 22.5mm 50V Electrolytic Radial (5.2mm) Pitch= 2.5mm 16V Electrolytic Radial (5mm) Pitch= 2.5mm 25V Electrolytic Radial (6mm) Pitch= 2.5mm 35V Electrolytic Radial (10.4mm) Pitch= 5mm 35V Electrolytic Radial (10.4mm) Pitch= 5mm 16V Electrolytic Radial (16.4mm) Pitch= 5mm SEMICONDUCTORS 7805 7815 7915 DIODES 1N4002 1N 4001 5 Volt 1A Linear Regulator 15 Volt 1A Linear Regulator -15 Volt 1A Linear Regulator General Purpose Rectifier General Purpose Rectifier MISCELLANEOUS PY1154 T1AL T6.3 AL or T10A 4031-050100001 4034-000030000 D100-SSV-12 RELAY ME14F 1A antisurge fuse 20mm (low breaking capacity) 6.3A or 10A antisurge fuse 20mm (low breaking capacity) Fuseholder 20mm Fuseholder cover FFC CONNECTOR 12-WAY, Vertical "Reverse needle" type, Single row of contacts RELAY ME14F-9H16S SPST 16A 250 Vac 9V coil Qty C omponent Ident N otes 1 R95 1 R78 1 R79 1 R87 Space off PC B Inrush resistor. Space off PC B 6 C29, C30, C34-C37 4 C20, C22, C31, C32 1 C13 or C23 dependant on pitch 1 C28 1 C16 2 C18,C19 1 C15 1 C14 2 C 24, C 33 MAX IMUM HEIGHT 25 mm 1 U2 1 U3 1 U4 9 D15-D22, D24 2 D9, D25 T O 220 Package T O 220 Package T O 220 Package DO41 Package DO 41 Package 3 F2 - F4 1 F1 4 F1, 2, 3, 4, 1 F1 1 CN2 2 RL3, RL4 T6A3 for 230V T10A for 115V Place on mains fuse holder F1 Mains & inrush control relays. AP16376/7 Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 32 Cambridge Audio Azur 840A Amplifier +48V R2 100R Q3 MPSA93 C8 47uF 16V R56 2K2 C7 47uF 35V D10 1N4148 D11 1N4148 R57 22K R3 68R Q4 MPSA93 R10 1K8 AMP IN LEFT JST 2.5MM B2B-XH-A CN3 1 2 C1 47U 16V R4 100R Q5 MPSA93 R5 100R Q6 MPSA93 R67 22K R27 2K2 NFB-L R11 1K2 3 +48V R13 2K2 C15 R14 VR1 100R 2 1K 1 1N4148 R78 100K 4n7 50V COG C6 1000U 10V EL D17 D18 1N4148 1 3 VR2 R80 2 1K 10K C20 10U NP 16V R79 100K -48V DC OFFSET NULL Q7 MPSA43 R6 68R R81 22K P1 PAD CHASSIS GND C14 100pF Q8 MPSA43 R7 68R Q11 BC337 Q9 MPSA43 D23 1N4148 C10 100pF R15 22K R8 R16 2K2 10K R72 R18 75K 100R R12 18R Q12 MJE340 R17 100R D2 1N4148 MPSA43 C9 47uF 16V Q1 MJE340 R54 R74 R1 16K 2K7 10R Q19 R33 3K6 R52 D14 R21 1K 12V 0R1 NFB-L R53 D16 R22 1K 12V 0R1 Q20 R34 MPSA93 3K3 R55 16K D1 1N4148 R76 2K7 R32 10R D24 1N4148 R23 100R D25 1N4148 R73 56K Q2 MJE350 Q15 2SC3264 R24 100R Q10 MPSA43 R50 47K Q25 R49 MPSA43 16K R9 R51 56R 10K -51V +5V R68 4K7 TH1 POSITIVE THERMISTOR ZPP22 100DEG 850R at 100degC MJE340,350 R69 10K R71 R75 1M 4K7 U1:B 5 7 6 HI = NORMAL LM393 R70 1K8 C18 100n ceramic OVERTEMP DETECT 100deg C cutout BC337 MPSA43/93 R90 100R D22 1N4002 R86 100R R85 10K R91 100R 3 2 D21 1N4002 R87 10R 4 8 R89 4K7 1 U1:A LM393 100K R88 LO = NO SHORT SPEAKER SHORT CIRCUIT TEST SYSTEM R19 0R1 Q13 2SA1295 R20 0R1 Q14 2SA1295 R62 150R Q27 MPSA93 D12 1N4148 D13 1N4148 R65 47K Q16 2SC3264 R25 0R1 R64 10K R63 1K R60 R61 1K1 1K1 Q29 MPSA93 Q28 MPSA93 R30 470R Q17 Q18 MJE340 2SA1295 R26 0R1 Q26 MPSA43 R58 470R R66 10K R59 470R R31 0R68 R82 47K +5V Q31 R83 10K MPSA93 XD ON/OFF SPEAKER TEST LOGIC GND CN2 LOGIC GND 1 +5V 2 +9V 3 SPEAKER TEST 4 CLIP 5 OVERLOAD 6 DC OFFSET 7 OVERTEMP 8 XD ON/OFF 9 MAINS FAIL 10 OUTPUT RELAY A 11 OUTPUT RELAY B 12 PHONES GND 13 MAINS FAIL IN 14 15 PHONES R 16 PHONES L FFC 16WAY PHONES L PREAMP PCB - LEFT POWER AMP PCB CONN D20 1N4148 D19 1N4148 C4 220uF 80V D7 1N5404 R29 10R 3W L1 1,7U 10A R28 2R2 3W C2 0u1 POLYESTER D9 1N5404 R40 220R 3W C PHONES L R41 470R 1W C R46 4K7 Q24 MPSA93 NORMAL = HI R48 CLIP 22K R47 47K 210mW J5 LEFT OUT TERMINAL J6 TERMINAL J7 OUTPUT GROUND TERMINAL D8 -48V R45 47K 50mW C5 220uF 80V 1N4148 R43 47K 50mW R44 47K 50mW Q23 MPSA43 R42 4K7 +48V R35 47K CLIP DC OFFSET CN1 1 +5V 2 LOGIC GND 3 SPEAKER TEST SENSE 4 +9V 5 OVERLOAD 6 CLIP 7 OVERTEMP 8 DC OFFSET 9 MAINS FAIL 10 XD ON/OFF 11 OUTPUT RELAY B 12 OUTPUT RELAY A 13 MAINS FAIL IN 14 15 PHONES GND 16 PHONES R FFC 16WAY LEFT POWER AMP TO RIGHT POWER AMP CONNECTOR LOGIC GND D4 1N4148 1N4148 D5 R37 100K Q21 MPSA43 D3 C3 22U 50V NP 1N4148 Q22 MPSA93 D6 1N4148 LOGIC GND R36 4K7 DC OFFSET DETECT -48V -48V DC OFFSET HI = NORMAL LEFT E CB E BC 321 Looking at pins C BE To enhance viewing, please print to A3 AP16693/5 Power Amplifier Left Channel 33 Cambridge Audio Azur 840A Amplifier 230 V 1 MAIN TRANSFORMER BROWN Primary 0V 2 BLUE 115 DEG C RED 5.5A 1 36 V ORANGE Secondary YELLOW 5.5A 2 0V 3 36 V GREEN 100 mA RED 5.5A 4 38 V 1 36 V FROM RECTIFIER BOARD +48V IN J1 TERMINAL RED J2 0V IN TERMINAL ORANGE J3 -48V IN TERMINAL YELLOW J4 +48V IN TERMINAL GREEN F1 T1A AL LVD! D15 1N4002 ORANGE 2 0V Secondary YELLOW 5.5A 3 36 V TO POWER AMP SUPPLY RIGHT GREEN 100 mA 4 38 V - + - + C12 15000U 63V C13 15000U 63V C11 1000uF 50V R38 33R 1W +48V POWER AMP SUPPLY LEFT -48V C17 220uF 100V -51V To enhance viewing, please print to A3 AP16693/5 Power Amplifier Left Power Supplies 34 Cambridge Audio Azur 840A Amplifier J4 J3 RED ORANGE V- J1 V+ 0V BLACK J2 GREEN F1 38V AC TH1 Q13 D15 RED OUTPUT J5 BLK BLK GND GND J6 J7 R38 C12 C11 R28 D7 FIX2 C4 C13 L1 C2 R29 Q12 Q14 R19 R20 R18 Q1 R3 D10 C17 D9 AP16694/4 AP16694/4 Q3 C9 Q19 VR2 Q20 C6 C14 P1 D17 Q15 Q16 Q17 R26 R31 R25 R30 Q18 R17 R21 D2 R1 R12 Q4 C7 VR1 BIAS R10 R11 R57 D11 R67 R56 R33 R52 R54 R81 R27 R5 R14 R2 Q6 R4 Q5 C1 D14 R74 R72 R40 Q29 Q27 Q26 R22 R32 R24 R62 R58 Q2 R53 Q8 R8 Q7 R23 D1 R73 R76 D16 R34 C10 R55 Q9 R7 R6 R13 Q25 D23 D25 D24 Q11 Q10 R60 R61 R64 D12 D13 R65 R9 R35 R15 D4 D5 DC OFFSET R49 FIX3 R16 R51 R44 D8 Q21 Q28 R59 R63 R66 C3 D3 D6 Q22 R36 R37 R42 R68 R69 R70 R50 R71 R75 C18 C20 CN3 R43 CLIP DETECT Q24 U1 Q23 R79 R80 R78 C8 R45 D18 R46 R47 R85 R91 R89 SPKR TEST R83 R82 Q31 OVERTEMP CN2 R86 R90 R88 R87 R41 CN1 D19 D20 FIX1 R48 D22 D21 To enhance viewing, please print to A3 AP16693/5 Power Amp PCB Board Layout (Top Side) 35 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print to A3AP16693/5 Power Amp PCB Board Layout (Bottom Side) 36 Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM AP16696/9 AP N o Value RESISTORS 10R 100R 910R 4K7 10K 22K 47K 100K 1M 10R 18R 56R 68R 100R 150R 470R 1K 1K1 1K2 1K8 2K2 2K7 3K3 3K6 10K 16K 22K 47K 56K 75K 100K 33R 470R 0R1 1R5 2R2 10R 220R CAPACITORS 100pF 100nF 100nF 10uF 22uF Description/T ype 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 1W Metal Film 1 W C arbon Pitch = 18mm 3 W Wire Wound 3 W Wire Wound 3 W Wire Wound 3 W Wire Wound 3 W C arbon Pitch = 22.5mm Ceramic 100V 10% Pitch= 3mm Ceramic 100V 10% Pitch= 5mm Polyester 10% Pitch= 10mm 16V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm 50V Non Polarised Electrolytic Radial (5.2mm) Pitch= 2.5mm Q ty C omponent Ident N otes 1 R87 3 R86, R90, R91 1 R70 6 R36, R42, R46, R68, R75, R89 3 R69, R83, R85 1 R48, 4 R43, R44, R45, R50 2 R37, R88 1 R71 2 R1, R32, 1 R12 1 R9 3 R3, R6, R7 R2, R4, R5, R14, R17, R18, R23, 10 R24, 1 R62 3 R30, R58, R59 4 R52, R53, R63, R80, 2 R60, R61 1 R11, 1 R10 4 R8, R13, R27, R56 2 R74, R76 1 R34 1 R33 4 R16, R51, R64, R66, 3 R49, R54, R55 4 R15, R57, R67, R81 5 R35, R47, R65, R73, R82 1 R73 1 R72 2 R78, R79, 1 R38 Space off PC B 1 R41 Space off PC B 6 R19-R22, R25, R26 Space off PCB 1 R31 Space off PC B 1 R28 Inductor damping res. No need to stand off PCB 1 R29 ZO BEL RES. Space off PC B 1 R40 Space off PC B 2 C10, C14 1 C18 1 C2 1 C20 1 C3 Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 37 Cambridge Audio Azur 840A Amplifier Power Amp Left PCB BOM AP16696/9 AP N o Value Description/T ype Q ty C omponent Ident N otes 47uF 47uF 220uF 220uF 1000uF 1000uF 15000uF 35V Electrolytic Radial (10mm) Pitch= 2.5mm 16V Electrolytic Radial (5mm) Pitch= 2.5mm 80V Electrolytic Radial (10.4mm) Pitch= 5mm 100V Electrolytic Radial (12.5mm) Pitch= 5mm 10V Electrolytic Radial (10.4mm) Pitch=5 mm 50V Electrolytic Radial (13.4mm) Pitch= 5mm 63V Electrolytic Radial (35.4mm) Pitch= 10mm SEMICONDUCTORS 1 C7 3 C1, C8, C9 2 C4, C5 1 C17 1 C6 1 C11 2 C12, C13 PY1152 LM393AP Dual differential comparator, A-version for low offset voltage 1 U1 D IL08 TRANSISTORS PY1148 PY1150 PY021 MJE340 MJE350 MPSA93 NPN Power Transistor PN P Power T ransistor PNP High Voltage PY013 PY214 PY1149 PY1147 MPSA43 NPN High Voltage BC 337-25 2SA1295 2SC3264 DIODES N PN Small Signal PNP Power Audio NPN Power Audio 1N4148 Small Signal Diode 1N 5404 1N4002 ZENER 12V 400mW General Pupose Rectifier General Pupose Rectifier Zener BZX79-C12 MISCELLANEOUS 4 Q1, Q12, Q18, Q30 TO126 1 Q2 T O 126 Q3-Q6, Q20, Q22, Q24, Q27- 11 TO92WIDE MPSA92 may be used Q29, Q31 Q7-Q10, Q19, Q21, Q23, Q25, 9 TO92WIDE MPSA42 may be used Q26 1 Q 11 T O 92 3 Q13, Q14, Q17 MT200 2 Q15, Q16 MT200 D1-D6, D8, D10-D13, D1718 D20, D23-D25 2 D7, D9 3 D15, D21, D22 2 D14, D16 DO 27 DO41 400mW DO35 Case. ZP221A501E PO SIT IVE T HERMIST O R 1 TH1 MULTITURN PRESET 1K Top adjust. Footprint 9.5 x 4.5 mm 1 VR1 MULTITURN PRESET 10K Top adjust. Footprint 9.5 x 4.5 mm 1 VR2 FFC CONNECTOR 16-WAY, PY1151 D100-SSV-16 Vertical "Reverse needle" type, 2 CN2 Single row of contacts T1A AL 1 Amp 20mm antisurge fuse 1 F1 N ominal operating temp 100 deg C Set quiescent current. Insert so adj screw next to R12 DC trim Insert so adj screw next to R78 4031-050100-001 Fuseholder 20mm 1 F1 08-1950100-150 1.7uH 10A INDUCTOR AP16831/3 To drawing Main heatsink 1 L1 1 Q13, 14, 15, 16, 17 10 turns of 1.5mm copper wire, diameter 20mm, length approx 20mm Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 38 Cambridge Audio Azur 840A Amplifier INPUT 1: BALANCED INPUTS INPUT 1 RIGHT + INPUT 1 RIGHT - XLR GND XLR GND INPUT 1 LEFT + INPUT 1 LEFT - CN5 1 2 3 4 5 6 JST 2,5MM B6B-XH-A CONN TO INPUT PCB XLR FEMALE CN8 1+G GND + 2 - RIGHT 3 XLR GND XLR FEMALE CN7 1+G GND + 2 - LEFT 3 36K RIGHT SIG GND LOOKING AT LEADS IN OUT 78L12 R55 R28 10K 10K C37 220U 25V EL C19 220U 25V EL ABUS GND C27 47U 25V C20 47U 25V ABUS GND R26 4K7 R14 4K7 HUB - INPUT PCB CONN CN3 HUB IN L HUB IN R 1 2 SIG GND SIG GND +5V 3 4 5 6 LOGIC GND 7 SWITCHER DATA OUT SWITCHER CLOCK OUT 8 9 10 SWITCHER STROBE OUT LEFT +5V 36K R59 R60 47K 47K FFC 10WAY LOGIC GND +5V C6 C26 47U 25V R27 4K7 C21 R4 4K7 47U 25V 14 C10 10uF 16V C23 100nF LOGIC GND MCLR HUB VDD RA7/OSC1/CLKIN RA0/ANO 16 17 RA6/OSC2/CLKOUT RA1/AN1 15 18 RA2/AN2/VRef 1 RA5/MCLR/THV RA3/AN3/COMP1 4 2 RA4/T0CKI/CMP2 3 RB0/INT 6 RB1/RX/DT 7 RB2/TX/CK 8 RB3/CCP1 9 RB4/PGM 10 RB5 11 RB6/T1OSO/T1CKI 12 RB7/T1OSI 13 5 VSS U5 PIC16F627-04/P HUB CLOCK OUT HUB DATA OUT STATUS PROGRAM_DATA PROGRAM_CLK +5V +5V 1 2 3 +5V R34 47R CA IR DEMODULATOR U6 36 kHz D1 TSOP1836 IR RECEIVER A +5V GND OPT IR receiver K R44 220R LOGIC GND R58 10K PGM IR IN 3.5mm JACK JACK-CKX-3.5-12 CN9 R19 47R C17 C18 100nF 10uF 16V 100nF R12 100R SIG GND ABUS GND +24V IN R56 390K +24V DETECT R57 100K LOGIC GND R11 22K +12V R10 10K R9 4K7 Q2 BC337 Q1 BC327 R7 100R R8 100R R42 10K CA IR DEMODULATOR ABUS GND STATUS LINE DRIVER R43 10K C25 47U 25V C22 47U 25V R40 4K7 R32 4K7 C28 47uF 25V C24 47U 25V R41 4K7 R33 4K7 C29 100nF C31 10uF 16V LOGIC GND U7:A 1 IR IN 3 2 4011 VDD=+5V 5 IR IN CN10:A AV2-8,4-14/EC R45 1 2 220R U8 1 LOGIC GND 6 5 2 3 4 NC OP4N25 R46 220K +5V R51 10K R47 10K CN15 TX 1 RX 2 GND 3 4 GND 5 6 7 8 9 BLOCK 10 PIC TX 11 12 13 LOGIC GND IR IN RS232 CONN CN16 1 2 TX R48 RX 3 GND 10K 4 CHAS Q4 BC337 PGM CONN-2.5PH-SIL4 MCLR HUB FEMALE PROGRAM_DATA PROGRAM_CLK LOGIC GND HUB DATA OUT HUB CLOCK OUT C30 100nF CERAMIC FFC 13WAY RS232 & IR CABLE FROM FRONT PANEL PCB LOGIC GND Q6 BC337 R53 100K R54 10K R52 10K Q5 BC337 LOGIC GND 3 2 IR 1 U4 +5V GND OPT IR receiver TSOP1837 IR RECEIVER 37 kHz U7:D 12 13 4011 VDD=+5V U7:C 8 9 4011 VDD=+5V 5 4 6 4011 U7:B VDD=+5V VSS=LOGIC GND 11 R50 100R IR OUT CN10:B AV2-8,4-14/EC 3 4 5 10 C39 1N 50V NP0 CHASSIS GND C11 100nF LOGIC GND R49 2R2 A K D2 D5 1N4148 D6 1N4148 R20 R21 470R 10K ABUS GND D7 BZX79C2V7 D8 BZX79C2V7 +12V Q3 BC337 R39 4K7 ABUS GND +12V C8 10uF 25V R6 12K U2 7812 3 VO C7 100nF +24V VI 1 2 GND +24V ABUS GND C1 +24V IN R13 D3 F3 C910R 2W 1N4004 220U 35V EL POLYFUSE 1-1A 2 CN2 1 C32 100n3F RICCO PCB JACK +24V IN 8 R29 12K R30 12K R31 12K 100nF 3 U1:A 1 2 NE5532 4 ABUS GND R5 12K C3 10pF U1:B 5 7 6 NE5532 R3 12K C2 ABUS GND R1 47R RIGHT ABUS GND R2 47R LEFT ABUS GND C4 10uF 25V C33 47pF C5 10uF 25V C34 47pF 10pF +24V C12 8 100nF 3 U3:A 1 2 NE5532 4 ABUS GND C14 10pF R18 12K U3:B 5 7 6 R17 NE5532 12K C13 ABUS GND R15 47R RIGHT C15 10uF 25V C35 47pF ABUS GND R16 47R LEFT C16 10uF 25V C36 47pF ABUS GND A-BUS A TOP OF CONN POLYFUSE 1-1A F1 CN1:B 9 GND 10 L 11 GND 12 IR 13 STATUS 14 R 15 0V 16 +24V VERT2RJ45 CN1:C 17 GND 18 GND2 19 GND3 20 GND4 21 GND5 22 GND6 VERT2RJ45 CHASSIS GND POLYFUSE 1-1A F2 CN1:A 8 GND 7 L 6 GND 5 IR 4 STATUS 3 R 2 0V 1 +24V VERT2RJ45 A-BUS B BOTTOM OF CONN 10pF R22 100R R23 100R R35 100R R36 100R R24 R25 27K 27K ABUS GND R37 R38 27K 27K ABUS GND CN4 IR EMITTER OUTPUTS 1 2 CN6 IR EMITTER OUTPUTS 3 4 To enhance viewing, please print to A3 AP163771/3 Hub PCB Schematic 39 Cambridge Audio Azur 840A Amplifier CHAS GND RX TX AP16378/3 RS232 AP16378/3 To enhance viewing, please print to A3 AP16377/3 Hub PCB Layout (Top Panel) 40 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print to A3 AP16377/3 Hub PCB Layout (Bottom Panel) 41 Cambridge Audio Azur 840A Amplifier Hub Board BOM AP16380/5 AP No V alue D escr iption/T ype Qty C omponent Ident N otes RESISTORS 47R 4K7 10K 12K 22K 27K 100K 390K 2R2 47R 100R 220R 470R 4K7 10K 47K 10R CAPACITORS 10pF 47pF 100nF 10uF 10uF 47uF 220uF PY259 PY1144 220uF SEMICONDUCTORS N E5532 CD4011BE 7812 O P4N 25 PIC16F627 -04/P PY1007 PY755 PY219 PY214 PY962 T SO P34837 T SO P34836 TRANSISTORS BC 327-25 BC 337-25 DIODES 1N4004 MV50640 1N4148 BZX79C2V7 MISCELLANEOUS AJ-600-21-F-4-B RDC-020-05 C KX -3.5-10 JY-5033P*030 CKX-3.5-12 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.125 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 0.25 W Metal Film 2 W Wire Wound 4 R1, R2, R15, R16 R4, R9, R14, R26, R27, R32, R33, 9 R40, R41 R10, R28, R42, R43, R47, R48, R51, 10 R52, R54, R55 8 R3, R5, R6, R17, R18, R29-R31 1 R11 4 R24, R25, R37, R38 2 R53, R56 1 R57 1 R49 2 R19, R34 R7, R8, R12, R22, R23, R35, R36, 8 R50 2 R44, R45 1 R20 1 R39 3 R21, R51, R58 2 R59, R60 1 R13 Space off PC B C eramic 50V 10% Pitch = 3mm C eramic 50V 10% Pitch = 3mm C eramic 50V 10% Pitch = 5mm 16V Electrolytic Radial (6.4mm) Pitch =2.5mm 25V Electrolytic Radial (6.4mm) Pitch =2.5mm 25V Electrolytic Radial (5.2mm) Pitch =2.5mm 25V Electrolytic Radial (5.2mm) Pitch =2.5mm 35V Electrolytic Radial (8.4mm) Pitch =3.5mm 4 C 2, C 3, C 13, C 14 4 C 33-C 36 C1, C6, C7, C11, C12, C17, C23, 10 C29, C30, C32 3 C10, C18, C31 5 C4, C5, C8, C15, C16 8 C20-C22, C24-C28 2 C19, C37 1 C9 Low noise dual O p Amp 2 U1, U3 Texas Instruments Quad NAND gate 1 U7 IC 12V, 1A regulator, T O 220 1 U2 O ptoisolator 1 U8 PIC Microcontroller 1 U5 37Khz IR Receiver Module 36Khz IR Receiver Module 1 U4 1 U6 D IL08 Alternative is N ational semi C D4011BC N T O 220 D IL06 DIL18 Contact Audio Partnership Service Department T SO P18V (Replaces T SO P1837) T SO P18V (Replaces T SO P1836) PN P Small Signal N PN Small Signal 1 Q1 5 Q 2-Q 6 T O 92 T O 92 General Purpose Rectifier diode Red LED Small Signal Diode Zener Diode 2.7 Volts 1 D3 2 D1, D2 2 D5, D6 2 D7, D8 NO ALTERNATIVE LED TO BE USED Fitted as part of assembly with AP17339/3 Allsun Dual vertical RJ45 DC power in connector Dual 3.5mm jack socket (green) Female XLR socket with gold pins Single 3.5mm jack socket (black) 1 CN1 1 CN2 2 C N 4, C N 6 2 CN7, CN8 1 CN9 IR EMIT T ER O UT PUT S Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 42 Cambridge Audio Azur 840A Amplifier Hub Board BOM AP No V alue D escr iption/T ype AV2-8,4-14/EC PY1143 D100-SSV-10 PY1142 D100-SSV-13 C O N N -2.5PH-SIL4 C O N N -2.5PH-SIL6 AP17339/3 PO LYFUSE 1-1A Dual phono socket with EMC gnd Orange inserts Vertical FFC conn, reverse-needle type single-row contacts 10-way Vertical FFC conn, reverse-needle type single-row contacts 13-way JST vertical header type X H JST vertical header type X H IR Receiver Housing RLD 30P110U Qty C omponent Ident 1 CN10 1 CN3 1 CN15 1 C N 16 1 CN5 2 Fit over D2/U4 and D1/U6 3 F1, F2, F3 AP16380/5 N otes For RS232 conn cableform For balanced input POLYFUSE 1.1A 30Vdc 7.4*14.2*3MM 6.6Sec Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 43 Cambridge Audio Azur 840A Amplifier 230 V 1 MAIN TRANSFORMER BROWN Primary 0V 2 BLUE 115 DEG C RED 5.5A J1 1 36 V TERMINAL RED F1 T6A3 AL LVD! ORANGE Secondary YELLOW 5.5A GREEN 100 mA RED 5.5A 2 0V J2 ORANGE TERMINAL 3 36 V J3 TERMINAL YELLOW F2 T6A3 AL LVD! 4 38 V 1 36 V C3 10nF 4 C1 C2 10nF 10nF ORANGE 2 0V Secondary YELLOW 5.5A 3 36 V TO POWER AMP SUPPLY RIGHT GREEN 100 mA 4 38 V 3 1 BR1 2 BRIDGE BR-254 J4 +48V OUT TERMINAL VIOLET J6 TERMINAL GREEN J5 -48V OUT TERMINAL BLUE To enhance viewing, please print to A3 AP17575/2 Rectifier PCB Schematic 44 Cambridge Audio Azur 840A Amplifier AUDIO PARTNERSHIP 2005 To enhance viewing, please print to A3AP17575/2 Rectifier Board PCB Board Layout (Top Side) 45 Cambridge Audio Azur 840A Amplifier To enhance viewing, please print toAAP3 17575/2 Rectifier Board PCB Board Layout (Bottom Side) 46 Cambridge Audio Azur 840A Amplifier, Rectifier PCB BOM AP No Value Description/Type CAPACITORS 10nF X1 Capacitor DIODES MEX103K300A02 Pitch =10mm Qty Component Ident 3 C14-C16 Bridge Rectifier BR254 400PIV 25A blk metal case 1 BR1 MISCELLANEOUS T6A3 AL 4031-050100-001 6.3 Amp 20mm anti surge Fuse, low breaking 2 capacity Fuseholder 20mm 2 F1, F2 F1, F2 Notes AP17578/2 Rectifier is not soldered to PCB until PCB is fixed to amplifier heatsink Note: resistors, capacitors and other 'generic' electronic components are not usually stocked by the manufacturer. Please obtain these locally. 47 Cambridge Audio Azur 840A Amplifier IC Pin Layout Details TC9163AF Input PCB (U1) NE5532 Input PCB - (U2, U3, U4, U5, U6, U7, U8, U9, U14 & U18) A-BUS PCB (U1 & U3) Pre-Amp PCB (U1, U2, U9 & U12) ULN2003A Input PCB - (U16) Pre-Amp PCB (U4, U5 & U7) BC337 Input PCB - (Q1) Pre-Amp PCB (Q2, Q3, Q4 & Q5) Front Panel PCB (Q2, Q3, Q4 & Q5) Right Hand Power Amp PCB (Q11, Q31, Q32, Q33, Q34, Q35 & Q36) A-BUS PCB (Q2, Q3, Q4, Q5 & Q6) Left Hand Power Amp (Q11) TSOP18 Pre-Amp PCB - (U10) PIC16F877A-I/SP Front Panel PCB 48 74HC4094 Front Panel PCB - (U2, U3, U4, U5 & U6) BC327 Front Panel PCB - (Q1 & Q8) A-BUS PCB (Q1) LM393AP Right Hand Power Amp PCB - (U1) Left Hand Power Amp PCB (U1) MJE340 Right Hand Power Amp PCB - (Q1, Q12 & Q18) Left Hand Power Amp PCB (Q1, Q12, Q18 & Q30) MJE350 Right Hand Power Amp PCB - (Q2) Left Hand Power Amp PCB (Q2) MPSA93 Right Hand Power Amp PCB - (Q3, Q4, Q5 Q6, Q20, Q22, Q24, Q27, Q28 & Q29) Left Hand Power Amp PCB (Q3, Q4, Q5, Q6, Q20, Q22, Q24, Q27, Q28, Q29, Q31) MPSA43 Right Hand Power Amp PCB - (Q7, Q8, Q9, Q10, Q19, Q21, Q23, Q25 & Q26) Left Hand Power Amp PCB (Q7, Q8, Q9, Q10, Q19, Q21, Q23, Q25, Q26) 49 2SA1295 Right Hand Power Amp PCB - (Q13, Q14 & Q17) Left Hand Power Amp PCB (Q13, Q14 & Q17) 2SC3264 Right Hand Power Amp PCB - (Q15 & Q16) Left Hand Power Amp PCB (Q15 & Q16) CD4011BE A-BUS PCB - (U7) 7812 A-BUS PCB - (U2) OP4N25 A-BUS PCB - (U8) PIC16F627-04/P A-BUS PCB - (U5) TSOP34837 A-BUS PCB - (U4) TSOP34836 A-BUS PCB - (U6) 50 AP16396/2 Azur 840A Amplifier Technical Description Start: Updated: 11 Aug 05 Version 2 29 Nov 05 Revision history V1->V2 More info added to operating instructions summary This document gives a concise guide to the operation of the 840A XD amplifier. CONTENTS Azur 840A power supply PCB AP16373/3_B Azur 840A front panel PCB AP16369/3 Azur840A input board PCB AP16361/3 Azur 840A preamp PCB AP16365/3 Azur 840A power amp Left PCB AP16693/4 Azur 840A power amp Right PCB AP16373/3_A Azur 840A A-BUS Hub PCB AP16377/3 Azur 840A Rectifier PCB AP17575/2 Operating instructions summary Service Menu ---==========================================--- NOTES Logic signals are in upper case, thus; MAINS FAIL References to "the PIC" or "the main PIC" are to the main housekeeping PIC on the front panel PCB unless otherwise stated. 51 The Power Supply PCB This carries: Power supplies for everything except power amps Mains on/off and inrush control switching relays X2 capacitor The mains-fail detect circuit There are four power supply rails: +15V Opamp supply -15V Opamp supply +9V Relay supply +5V Microcontroller, logic and comparator supply The power supply board also carries the mains switching relays that control the supplies to the power amplifiers. When the amplifier goes from standby to ON, the inrush control relay RL4 closes first with R78 limiting the inrush current. After 3 seconds (while speaker-short testing is going on- see below) the On/Off relay RL3 closes. 100 msec later (to ensure no break in the supply) RL4 opens. When the amplifier goes from ON to standby, RL3 simply opens. The front panel PCB This carries: The main PIC The volume rotary encoder and control switches. The LCD display Shift registers for driving the relays The RS232 interface for control and software updates U1 is the main housekeeping microcontroller for the amplifier; it is a 16F977A PIC running at 20 MHz. It handles all the control functions of the amplifier except for those on the A-BUS hub PCB, which are dealt with by another PIC on that board. PIC pins handling amplifier conditions: Speaker short-circuit detect Phones detect Mains fail DC offset protection Overtemperature protection Overload protection Clip detection Pin Normal 7 LOW 27 HIGH 28 LOW 29 HIGH 30 HIGH 33 HIGH 34 HIGH Active HIGH Active= short found LOW Active= Phone jack in HIGH LOW LOW LOW LOW The LCD display module interfaces to the front panel PCB through CN2. Display data from the PIC is clocked serially into shift register U2 and sent to the LCD module in byte-wide parallel format. The LCD module is powered from the +5V rail. 52 The relays on the other PCBs are controlled by a set of shift registers that convert serial data from the PIC into 32 latched outputs. Four shift registers (U3,U4,U5,U6) are connected so that the serial input enters the first register and is clocked through and out of its serial output into the serial input of the second register. Changing any output requires 32 bits to be clocked through the registers by the SERIAL CLOCK signal. When SERIAL STROBE goes high the data is latched in each register to give a static output. Data appears at the outputs only when the SHIFT REG ENABLE line is high. This line is kept low at start-up to prevent random data at the outputs, and only goes high when the PIC has initialised the shift registers. The RS232 interface is used to control the amplifier and can also be used to reprogram the main PIC. The interface consists of Q3 and Q4. Q3 handles incoming RS232 data, providing a level-shift from RS232 levels (nominally +/-9V) to PIC levels (+5V/0V). Q4 handles outgoing RS232 data, level shifting it to give a +15V/0V output. The main PIC is reprogrammed by holding the standby/ON button in when the mains power is turned on. The word DOWNLOAD appears on the LCD. A PC running a Windows program is used to download the program. The Hub PIC can in turn be reprogrammed by the main PIC. This is done by the PGM, MCLR HUB, PROGRAM_DATA, and PROGRAM_CLOCK lines that go to the Hub PCB via CN3. The Input PCB The input PCB carries: Input buffers Input select relays Tape out buffer Input amplifier +6 dB Hub input switcher Relay drivers The input PCB has one stereo input (Input 1) that accepts both balanced and unbalanced signals, and six more unbalanced stereo inputs. There is a further input for tape monitor use. There is a tape output, taken from before the tone and volume controls, and a preamp output taken from after the tone and volume controls. All component numbers here refer to the Left channel. The A-BUS hub also uses the amplifier inputs. The required input is selected separately from the main amplifier input by the CMOS switching IC U1. This is controlled by serial data from the microcontroller on the hub PCB, in response to switch presses or IR commands. The relays are driven from an 8-bit serial-in parallel-out (SIPO) shift register on the front panel PCB. The eight logic signals come in on CN8 and control the 7-way open-collector relay driver U16. The eighth relay is controlled by Q1. 53 The Preamplifier PCB The preamplifier PCB carries: The tone controls and DIRECT switch Relay balance control Balance control buffer Amplifier Relay volume control Volume control post amplifier Relay drivers ON/standby LED control The IR receiver Headphone socket All component numbers here refer to the Left channel. The balance control operates in discrete steps selected by relays. There are eight steps on each side of the central position. This is implemented by switching in combinations of three attenuator sections; the first is R97,R22,R105, the second R85,R87 and the third R88,R86,R89. These are switched in or out by relays RL17, RL18 and RL19. When none of these relays are energised the balance network gives the first step of attenuation due to R97. When RL15 is energised the balance attenuator network is inserted into the left channel and the stereo image is shifted to the right. When RL16 is energised the balance attenuator network is inserted into the right channel and the stereo image is shifted to the left. The balance control attenuation steps are: Step Nominal dB 0 0 1 -1.3 2 -2.5 3 -3.4 4 -4.5 5 -5.5 6 -6.8 7 -7.7 8 -8.8 The volume control is a relay-driven stepped attenuator that gives 1 dB steps from 0 dB to -64 dB. There are 2 dB steps from -64 dB to -76 dB, and two final steps of -84 dB and -infinity. The final step also opens the power amplifier output relays to ensure that "off" is well and truly off, The volume control has an array of 14 resistances connected to an output rail. Each resistance is connected to either the input signal rail or ground by its associated relay. (RL1 to RL14) The resistances are typically made up two resistors to obtain the exact desired value. This represents a potential divider that allows very fine control of attenuation. The 1 db steps are accurate to within +/-0.2 dB. The volume network has a constant output impedance of 312 Ohms, independent of volume setting. The volume setting is stored in non-volatile memory when the unit is switched off at the mains. The volume control can be set to ramp up from zero to the stored setting at power-up, and to ramp down on going to standby; this is an option on the configuration menu. 54 The volume control and balance relays are driven from three 8-bit serial-in parallel-out (SIPO) shift registers on the front panel PCB. The logic signals come in on CN6, CN8 and CN9, and control the 7way open-collector relay drivers U4,U5,U7. Driver U7 also controls the mains on/off and inrush relays, (on the PSU PCB) the two amplifier output relays, (on the right amplifier PCB). R111 is a pull-up resistor which allows MAINS ON/OFF RELAY to go high during testing if the PSU board is not being used to power front-panel and preamp PCBs, and thus permits the LED control to work properly in this condition. Headphone socket The phones Left and Right signals come in from the two amplifier PCBs. When a jack is inserted in to the phones socket, the normally-closed contacts open, and the PHONES DETECT signal goes low, signalling the PIC to open the output relays and disconnect the loudspeakers. Power Amplifier PCBs The power amplifier boards are very similar. The left channel is described in detail, and the right channel description deals only with the differences. Power Amplifier Left PCB This description is subdivided as follows: Input stage DC trim system. The Voltage Amplifier Stage Biasing system Output stage The XD Crossover Displacement system Power supplies Overload protection Clip detection DC offset protection Over-temperature protection Speaker short-circuit detection Headphone output attenuator DC trim system. VR2 and its associated components make up the DC trimming network; this allows to output DC offset to be reduced to less than 1mV. The XD Crossover Displacement system. The essence of the Crossover Displacement principle is the injection of an extra current, varying with the signal, into the output point of a conventional Class-B output stage, with the result that the crossover point is displaced away from the no-signal voltage. The displacement current is made proportional to the output voltage. For example, if the displacement current is 1 Amp with the output at quiescent at 0V, it is set to increase to 2 Amps with the output fully negative, and to reduce to zero with the output fully positive. 55 The XD control circuit is a differential pair of transistors with one input grounded and the other driven by the main amplifier output voltage, scaled down appropriately by R63, R64. The drive to the displacer is taken from collector load R58, to give the required phase inversion. R59 is present simply to equalise the dissipation in the differential pair transistors to maintain their balance. The tail of the differential pair is fed by constant-current source Q27. Since half of the standing current through the differential pair flows through R58, the value of the tail current-source sets the quiescent displacement current. Q27 is a simple current-source biased by silicon diodes D12, D13. The displacement current itself is handled by the voltage-controlled current source Q18, Q17. The Q18, Q17 structure acts as a unity-gain voltage stage with 100% voltage feedback from Q17 collector to Q18 emitter, and it sets up the voltage across R58 as a voltage across the low-value resistor R31, minus the Vbe drop of Q18. There is provision for turning off the XD system under PIC control, to make servicing easier. This is done by Q26. Normally the XD ON/OFF signal coming in on Pin 9 of CN2 is high, (+5V) so Q31 is held off and Q26 is off. When XD is disabled, XD ON/OFF goes low and Q31 is turned on via R83. Q26 is then turned on via R82. The equivalent to Q26 on theright power amp PCB is also turned on by the connection through Pin 10 of CN1. Power supplies The power supply for the power amplifier consists of three rails. The voltages given here are nominal as they depend on the exact value of the mains supply voltage The +48V rail supplies all the positive power to the amplifier. The -48V rail powers only the amplifier output stage, including the XD Crossover Displacement system. The -51V rail provides negative power for the small-signal circuitry. This permits greater output as without it the negative-going voltage-swing of the voltage-amplifier stage is limited, and negative clipping occurs before positive clipping. Overload protection. The amplifier is protected against short-term overloads by dual slope VI limiting. The upper half of the output stage is protected by Q19 and associated components. When overload occurs Q19 conducts and shunts current away from the base of Q1, limiting the amplifier output. The current so shunted is limited in magnitude by the current-source Q4. D2 prevents Q19 conducting backwards on negative output excursions. The protection of the lower half of the output stage is very similar, Q20 being the VI limiter. However, in this case the current shunted away when Q20 conducts is not inherently limited; this is done by the extra current-limiting circuit Q11, R15, R16. When the voltage across R9 becomes excessive, Q11 turns on and shunts the base drive away from Q9. The amplifier is protected against long-term overloads by the PIC opening the output relay. Operation of the VI limiter Q20 draws extra current through R9 and turns on Q25 via R49; this happens at a lower current than that at which Q11 limits the VAS current. Q25 collector is wire-ORed with the equivalent transistor on the right-hand amplifier PCB, and the OVERLOAD SIGNAL goes to the preamp PCB via CN2, pin6. 56 Clip detection. When it is enabled, the clip-detect system turns down the volume when excess clipping of either amplifier output occurs. Very brief episodes of clipping are ignored. The volume stays reduced and does not ramp back up in the absence of clipping. The clip detect system is based on Q23, Q24 and associated components. Normally both transistors are on, and the CLIP signal at Q24 collector is high. Since the circuit operates by monitoring how far the output is from the supply rails, variations in supply voltage are compensated for. DC offset protection: The output of the Left amplifier is filtered by R35 and C3 to remove audio content. If a DC voltage of either polarity exists Q21,Q22 turn on and the voltage on Q21 collector falls. This point is wire-ORed with the DC offset detector voltage on the right power amplifier PCB via CN1. Detailed operation is as follows: +ve DC offset: D4, Q21, Q22, D6 conduct. Other diodes reverse-biased. -ve DC offset: D3, Q21, Q22, D5 conduct. Other diodes reverse-biased. Overtemperature protection Positive thermistor TH1 is mounted on the main amplifier heat-sink. At approx 100degC, its resistance has risen to the point that the voltage on pin 6 of comparator U1:B exceeds the reference voltage of +850 mV set up by R69,R70, and the comparator output goes low to 0V. R71 provides a small amount of hysteresis to give clean switching. The comparator has an open-collector output and R75 is the external pull-up resistor. The output signal is passed to the main PIC. Speaker short-circuit detection When the amplifier goes from standby to ON, the speaker outputs are checked for short-circuits before the output relays are closed. This system is centred on comparator U1:A but also involves circuitry on the Right Amplifier PCB. Short-circuits are checked for by passing a small current through the loudspeaker impedances and monitoring the resulting voltage. A DC current of 5mA is injected through R101 on the Right Amplifier PCB, via the normally-closed contacts of RL1 and RL2. This places all connected loudspeakers, left and right, A and B, in parallel so the resulting voltage is not large. It is sent to the left amplifier PCB, where comparator U1:A compares it with a reference voltage of 5mV set up by potential divider R85,R87. If the combined loudspeaker resistance is below 1 Ohm, the output of U1:A goes high, signalling a short condition to the main PIC. Headphone output attenuator The headphone output attenuator comprises R40 and R41. The headphone socket is on the preamp PCB. Power Amplifier Right PCB This description is subdivided as follows: The right power amplifier The output relays Output relay control system Mains-fail detect system 57 The right power amplifier and its various protection systems operate identically to those on the left amplifier PCB, except for the following differences: Mains-fail detect system The mains-fail detect system is based on comparator U1:B. It takes the MAINS FAIL IN signal from the PSU board (see above) and compares it with a reference voltage of +310 mV set up by potential divider R81,R80. When MAINS FAIL IN drops below this threshold, the output goes high. This signal, MAINS FAIL, is sent to the PIC via CN1, pin 9. A-BUS Hub Board This board carries the following functions: The XLR sockets for the balanced input mode of Input 1 Two A-bus outputs Hub IR input Hub microcontroller Hub Power supply IR in/out interface The XLR sockets simply pass the Input 1 signals down to the input board via screened cables. The A-bus outputs take an input selected by the hub input switcher, amplify it by 2.5 times, and send it to the remote keypads. R59,R60 are DC drain resistors that minimise clicks shortly after power-up. The output amplifiers U1,U2 work from a single +24V rail, and so are biased to sit at +12V. The bias supply is derived from the +12V supply rail. The hub amplifiers have their own ground (ABUS GND) to prevent ground loops, and this use of the differential amplifier performs a change of reference so a clean signal reaches the hub amplifier seven if the two grounds have noise voltage between them. The hub microcontroller U5 is a PIC16F72. This performs the following tasks: Control Hub input switcher from IR commands Send input select data to main PIC Control Hub input switcher to prevent thumps on 840A output Control A-bus status line IR commands to the A-bus keypads are sent to the hub so that the required input can be selected and external equipment controlled. Thus, for example, a tuner station can be changed from the keypad; the IR comes to the hub, is sent out again via the IR emitter outputs, and activates emitters pointing at the tuner unit. Modulated IR signals coming in from the keypads are diode-ORed together by D5, D6. The Zener diodes D7, D8 reject low-level noise on the incoming IR lines. The combined IR signals are buffered by emitter-follower Q3, and sent out via CN4, CN6 to drive external IR emitters. Incoming modulated IR signals for input select are also sent to the Hub PIC U5; LED D2 is driven from Q3, and points at IR receiver U4, the pair being housed in a small light-tight enclosure. The demodulated IR is then applied to Pin 7 of Hub PIC U5, which sends appropriate commands to the hub input selector IC on the input PCB, over the strobe, clock and data lines. 58 Information on which Hub input is selected (or if no input is selected) is sent from the Hub PIC to the main PIC by the two lines HUB CLOCK OUT and HUB DATA OUT. This is then displayed on the LCD. The active 840A input is denoted by a round marker; the active Hub input is denoted by a circle around it. The Hub PIC controls the A-bus status line so that it is high when the 840A is powered and low when it is not. It also implements the "all off" feature; when this command is received from one keypad the Hub PIC ensures that both are turned off. The Hub PIC can be reprogrammed by the main PIC. This is done by the PGM, MCLR HUB, PROGRAM_DATA, and PROGRAM_CLOCK lines that come from the front panel PCB via CN15. IR in/out interface The other IR system on the Hub PCB is wholly concerned with control of the 840A amplifier itself, and has no connection with the Hub IR system. Modulated IR data (as an electrical signal) enters via 3.5mm jack CN9, and drives LED D1, which illuminates IR receiver U6, the pair being housed in a small light-tight enclosure. This demodulates the IR and passes it on to U7:A, which ORs it with the data from the unmodulated IR input, and sends the IR IN signal to the main PIC via CN15. When it reaches the front panel PCB (see above) it is further ORed with the IR data from the receiver on the front of the 840A unit. The unmodulated IR signals enter via phono connector CN10:A, and drive optocoupler U8; this isolates the grounds and prevents ground loops. The optocoupler output drives Q4 through R47. Q4 collector, if Q6 is off, provides the IR signal to U7:A as mentioned above, and also drives Q5 via R53, to re-invert the signal and preserve its phase. It is then OR-ed with the PIC TX signal by U7:B, and buffered by U7:C and U7:D to provide enough drive for the IR output. R50 protects the output and C11,R49 isolate the IR output ground. IR commands can also be generated by the 840A itself. These come from the main PIC as the signal PIC TX on CN15, and are combined into the IR output as described above. When such commands are being sent, it is important to disable any external IR commands from being sent through as they will combine to give garbled data. This is done by the BLOCK signal from the main PIC, coming in via CN15. When this is high it turns on Q6 and prevents external IR commands from reaching Q5. The Rectifier PCB This board mounts on the main heat-sink of each amplifier module. It consists of the rectifier itself, three suppression capacitors to reduce RF noise created by rectifier commutation, and two fuses in the incoming AC lines from the transformer. ---================ ================== ============--- Operating Instructions Summary This is a very brief guide to enable all the controls and menus of the 840A to be accessed if the full manual is not available. (seewww.cambridge-audio.comfor a downloadable user manual). To adjust the balance: Briefly press the Mode button. The balance display appears and can be changed using the volume knob. To return to volume mode, give the Mode button another quick press. The 840A will automatically return to volume mode after 5 seconds. 59 To rename inputs: Press and hold the relevant input select button. Letters in the name are selected by turning the volume knob. To access the configuration menu: Press and hold the Mode button. These are the menu options: Clip detector on/off LCD brightness (off/dim/bright) Input gain trim menu access Volume ramp on/off Volume display: -84 to 0 dB or 0 to 72 units Fixed input gain menu access To adjust the gain of an input: Press the button next to INP TRIM Select the input required Use volume knob to set gain between 0 and -12 dB (the available range is restricted if the volume is set very low) Press Mode button to return to volume display To set up fixed input gain Press the button next to FIXED INP Select the input required Set the fixed gain using the volume control. (the OFF setting does not disable the input- it leaves the input gain subject to the volume control) Press Mode button to return to volume display To access the service menu: Hold in the Mode button when mains power is switched on. These are the menu options: Speaker short detection on/off DC offset detect on/off XD system on/off Counter access Press Mode button to return to volume display The counter page keeps a total of the number of times these events have occurred: Clipping detected CL DC offset detected DC Overload protection OV Overtemperature shutdown TM Speaker short detected SH Time on in hours ON Press Mode button to return to service menu To reprogram the PICs: Hold in the ON/standby button when mains power is switched on. The word DOWNLOAD appears on the LCD. 60 840A Software Loading Instructions 1) Push and hold the "Standby / On" on the front of the840A whilst turning on the power switch at the rear. After about 4 seconds the following should be displayed on the LCD: 2) Connect a Null Modem RS232 cable from the 840A to the PC's comm port. 3) Run the Loader program from the Azur 840A program group in the start menu. The following window will be displayed: 4) Choose the comm port the RS232 cable is attached to and click OK. The following window will be displayed: 61 5) Click the Load File button, the following window will be displayed: Locate the file "840A.hex" and click open. The following window should be displayed: 6) Click the Download Code button, "Loading..." will be displayed on the LCD. The ABUS processor will be programmed followed bythe Main processor. Once the programming has finished, "Programming Completed!" will be displayed and the 840A will reset. 62 840A ________________________________________________________________________________ Notes. 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