Owner's Manual for SONY models including: STR-DB925 AV Receivers, STR-DB925, AV Receivers, Receivers
Parts for Sony STR-DB925 Amplifier – Need A Part
File Info : application/pdf, 9 Pages, 426.34KB
DocumentDocumentSERVICE MANUAL
STR-DB925
AEP Model UK Model
Australian Model
Photo: BLACK
SPECIFICATIONS
MICROFILM
-- Continued on next page --
FM STEREO/FM-AM RECEIVER
1
Notes on chip component replacement · Never reuse a disconnected chip component. · Notice that the minus side of a tantalum capacitor may be
damaged by heat.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
2
TABLE OF CONTENTS
1. SERVICING NOTE .......................................................... 3
2. GENERAL .......................................................................... 5
3. DIAGRAMS 3-1. Circuit Boards Location ........................................................ 6 3-2. Block Diagrams
· DSP Section ........................................................................ 7 · Input Section ....................................................................... 9 · Power Section ................................................................... 11 · Dolby Section ................................................................... 13 3-3. Schematic Diagram Input Section ................................ 17 3-4. Printed Wiring Board Input Section .............................. 19 3-5. Schematic Diagram Power AMP Section ..................... 21 3-6. Printed Wiring Board Power AMP Section ................... 23 3-7. Schematic Diagram Trans Section ............................... 25 3-8. Printed Wiring Board Trans Section ............................. 27 3-9. Schematic Diagram Rear AMP Section ........................ 29 3-10. Printed Wiring Board Rear AMP Section .................. 31 3-11. Schematic Diagram Display Section ......................... 33
3-12. Printed Wiring Board Display Section ....................... 35 3-13. Schematic Diagram Panel Section ............................. 37 3-14. Printed Wiring Board Panel Section ........................... 39 3-15. Schematic Diagram Back Panel Section .................... 41 3-16. Printed Wiring Board Back Panel Section .................. 43 3-17. Schematic Diagram Volume Section .......................... 45 3-18. Printed Wiring Board Volume Section ....................... 47 3-19. Schematic Diagram D In/Out Section ........................ 49 3-20. Printed Wiring Board D In/Out Section ..................... 50 3-21. Schematic Diagram Digital (1/2) Section .................. 51 3-22. Schematic Diagram Digital (2/2) Section .................. 53 3-23. Printed Wiring Board Digital Section ........................ 55 3-24. IC Block Diagrams ........................................................... 57 3-25. IC Pin Functions ............................................................... 60
4. EXPLODED VIEWS 4-1. Case and Back Panel Section .............................................. 68 4-2. Front Panel Section ............................................................. 69 4-3. Chassis Section ................................................................... 70
5. ELECTRICAL PARTS LIST ........................................ 71
SECTION 1 SERVICING NOTE
FACTORY SET Mode which sets the preset settings of the unit to that at shipment.
Procedure: With the power off, press the 1/u button while pressing the SET UP and SOUND FIELD ON/OFF buttons to turn ON the power. "FACTORY SET" will be displayed and FACTORY PRESET will be executed. As the "DEMO MODE" will automatically be set about 1 minute later, press the 1/u button to turn OFF the power.
INITIALIZATION This mode erases all the preset settings of the unit. Use this mode when returning the unit to custimer.
Procedure: With the power off, press the 1/u button while pressing the DISPLAY and SOUND FIELD ON/OFF buttons to turn ON the power. As the "DEMO MODE" will automatically be set about 1 minute later, press the 1/u button to turn OFF the power.
FLUORESCENT INDICATOR TUBE AND LED LIGHTING CHECK Mode which lights up the whole fluorescent indicator tube or partially.
Procedure: With the power off, press the 1/u button while pressing the SET UP and SOUND FIELD MODE buttons to turn ON the power. The whole fluorescent display tube will light up. As the "DEMO MODE" will automatically be set about 1 minute later, press the 1/u button to turn OFF the power.
DEMO MODE (NOT USED IN SERVICE) Mode for demonstration
Procedure: With the power off, press the 1/u button while pressing the CURSOR button to turn ON the power. To end, press the 1/u button to turn OFF the power.
PRECAUTIONS ON REMOVING THE FRONT PANEL When the front panel is removed, the front panel board and VOLUME board cannot be connected, thus causing the following problems. · The MASTER VOLUME LED does not light up · The MASTER VOLUME cannot be turned UP/DOWN using the remote controller.
3
DSP SELF DIAGNOSIS FUNCTION This unit is equipped with a DSP self-diagnosis function. After completing self-diagnosis, the "DSP TEST MODE" can be set, where signals input from the external equipment will be assigned to the designated channels as shown in the table below.
Table-1 Assignment of Signals in DSP TEST MODE
Input Signal FRONT L-ch FRONT R-ch
Output To FRONT L-ch + CENTER + REAR L-ch FRONT R-ch + WOOFER + REAR R-ch
Procedure:
1. Connect external equipment such as CD and DVD players using the DIGITAL cable (optical or coaxial). 2. Rotate the FUNCTION knob, and switch to the FUNCTION connecting the external equipment.
3. Press the INPUT MODE button, and select the type of DIGITAL signal connected at 1.
("AUTO INPUT" is recommended for convenience.) 4. Press the 1/u button to turn OFF the power. 5. Press the 1/u button while pressing the SET UP and SOUND FIELD GENRE buttons to turn ON the power. 6. Perform DSP check in the following sequence to display the results. If no problems, "DSP NO ERROR" will be displayed on the
fluorescent indicator tube, and the reference signals of the 1 KHz internal oscillation will be output to FRONT, REAR, CENTER, and
WOOFER.
Sequence :
1 DSP1 BOOT ERROR CHECK (DSP1:IC1301)
µ 2 DSP1 REPLAY ERROR CHECK
µ 3 DSP2 RAM ERROR CHECK (DSP2:IC1402 RAM:IC1402)
µ 4 DSP2 REPLAY ERROR CHECK
Refer to Table 2 if errors occur and perform the repairs.
Table-2 Display of Errors and Main Causes
Error Message DSP1 BOOT ERROR DSP1 REPLY ERROR DSP2 RAM ERROR DSP2 REPLY ERROR
Possible Cause and Countermeasure Faulty connection of IC1301, fault around the power supply of IC1301 Fault of peripheral circuit of Pin @º of IC1301 Faulty connection with RAM (IC1402) Faulty communication with microprocessor, fault of peripheral circuit of Pin !£ of IC1401, fault around power supply and clock of IC1401
7. Each time the < , , , or > button is pressed, the display changes between "DSP TEST MODE" and "DSP NO ERROR". When "DSP TEST MODE" is displayed, the signals input from the external equipment connected at 1. will be assigned to the outputs as shown in Table 1. When "DSP NO ERROR" is displayed, the reference signal of the internal oscillation will be output to the FRONT, REAR, CENTER, and WOOFER channels. (Each time the < , , , or > button is pressed, self-diagnosis will be executed from 3 of step 6.
8. To end, press the 1/u button and turn OFF the power.
Note: Do not touch other buttons except < , , , or > during this mode with a specific purpose. Messages are displayed in the same way as in normal operations. Operations itself will not be normal here, therefore if other buttons or knobs are touched by accident and the message is changed, press the 1/u button to turn OFF the power and exit the mode.
4
Front Panel Descriptions
SECTION 2 GENERAL
1
234 56
7 8 9 10 11 12
13
14 47
15
46 45 44 43 42 40 39 38 37 363534 3332 28 24 23 22 21
41
29 30 31 27 26 25
18 19 17 16 20
LOCATION OF PARTS AND CONTROLS
1 1/u (power) switch 2 VIDEO 1 indicator 3 VIDEO 2 indicator 4 VIDEO 3 indicator 5 DVD indicator 6 TV/LD indicator 7 MULTI CHANNEL DECODING indicator 8 TAPE indicator 9 MD/DAT indicator 10 CD indicator 11 TUNER indicator 12 PHONO indicator 13 MASTER VOLUME knob and indicator 14 MUTING indicator 15 MUTING button 16 FUNCTION knob 17 MODE switch 18 SOUND FIELD indicator 19 EQ indicator 20 BASS BOOST button 21 BALANCE knob 22 SOUND FIELD ON/OFF button 23 SOUND FIELD MODE button 24 SOUND FIELD GENRE button
25 INPUT MODE button 26 5.1 INPUT button 27 EQ ON/OFF button 28 SET UP button 29 SURROUND indicator 30 EQUALIZER indicator 31 INDEX indicator 32 <, , , > buttons 33 SET UP button 34 RDS EON button 35 RDS PTY button 36 TUNING + button 37 TUNING button 38 VIDEO 3INPUT jacks 39 FM MODE button 40 MEMORY button 41 DISPLAY button 42 PRESET TUNING + button 43 PRESET TUNING button 44 FM/AM button 45 SHIFT button 46 PHONES jack 47 SPEAKERS knob
5
3-1. CIRCUIT BOARDS LOCATION
SECTION 3 DIAGRAMS
SP-S board
VIDEO board
S-VIDEO board
H.P board
TUNER board D. IN/OUT board
F-VIDEO board BALANCE board
5.1 IN board AUDIO board
VOLUME board
AC board AMP board
LED board
DISPLAY board
REG board REAR AMP board JOINT board
SP SW board
SW board ROTARY board
DIGITAL board INPUT board
6
SECTION 4 EXPLODED VIEWS
NOTE: · Items marked "*" are not stocked since they are
seldom required for routine service. Some delay should be anticipated when ordering these items. · Color Indication of Appearance Parts Example: KNOB, BALANCE (WHITE)
 Cabinet's color
· The mechanical parts with no reference number in the exploded views are not supplied.
· Hardware (# mark) list and accessories and packing materials are given in the last of this parts list.
The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number
specified.
4-1. CASE AND BACK PANEL SECTION
1
2
1
14 13
Front panel #2
21
22
20
#2
Ref. No.
1 1 *2 *2 *3
Part No.
Description
4-210-291-01 SCREW (CASE 3 TP2)(BLACK) 4-210-291-11 SCREW (CASE 3 TP2)(SILVER) X-4950-431-1 CASE ASSY (BLACK) X-4950-432-1 CASE ASSY (SILVER) 1-670-001-11 AUDIO BOARD
*4
A-4414-113-A SP-S BOARD, COMPLETE
*5
1-670-004-11 S-VIDEO BOARD
6
1-769-904-11 WIRE (FLAT TYPE)(9 CORE)
*7
1-670-003-11 VIDEO BOARD
8
1-693-409-11 TUNER
*9 * 10 * 11 * 12
4-900-493-21 PANEL, BACK 1-670-029-11 D.IN/OUT BOARD 1-670-000-11 TUNER BOARD A-4414-117-A DIGITAL BOARD, COMPLETE
4
1
18
65
7
3
CNJ909
#2
#2
#2
19
#2
#2
#2 #2
#2 #2
#2
9 10
11 8
17
#2
not supplied
#2
15 16
15
#2
16
#2 #2
12
#1
Remark
Ref. No. * 13
#1
Part No.
Description
3-703-244-00 BUSHING (2104), CORD
! 14 15 16
* 17 18
1-769-744-11 CORD, POWER X-4949-523-1 FOOT ASSY (F50180S) 4-970-124-01 CUSHION (F50180S) 1-670-022-11 5.1 IN BOARD 1-769-876-11 WIRE (FLAT TYPE)(7 CORE)
19
4-947-010-01 SCREW, FEEDER FIXED
20
X-3375-592-1 KNOB (VOL) ASSY (BLACK)
20
X-4950-340-1 KNOB (VOL) ASSY (SILVER)
21
4-998-207-11 INDICATOR (VOL)
22
3-350-426-01 SPRING, RING
! CNJ909 1-526-794-11 OUTLET, AC
Remark
69
4-2. FRONT PANEL SECTION
70
75
51
#3
73 61
58
78 69 62
69 64
63
69
65
66 77
80
FL101
69
54 67 69
59
76 56
79 60
69 71
80 81 69 72
68
74
57
53 55
#2
52
#3
Ref. No.
51 51 52 * 53 * 54
Part No.
Description
4-900-570-01 ESCUTCHEON (A-LID)(BLACK) 4-900-570-11 ESCUTCHEON (A-LID)(SILVER) 4-900-492-01 KNOB (LID) 4-900-569-01 ESCUTCHEON (M-LID) 4-900-579-01 COVER (STI)
55
X-4948-601-1 KNOB (FUNC) ASSY (BLACK)
55
X-4950-280-1 KNOB (FUNC) ASSY (SILVER)
56
4-900-500-01 KNOB (BAL)(BLACK)
56
4-900-500-11 KNOB (BAL)(SILVER)
57
4-900-568-01 PANEL, FRONT (BLACK)
57
4-900-568-31 PANEL, FRONT (SILVER)
58
4-900-566-01 WINDOW
59
4-900-572-11 FULCRUM (L)
60
4-900-571-11 FULCRUM (R)
61
X-3375-590-1 BASE ASSY, PANEL (BLACK)
61 62 62 63 * 64
X-4950-278-1 BASE ASSY, PANEL (SILVER) 4-900-563-01 BUTTON (5)(BLACK) 4-900-563-11 BUTTON (5)(SILVER) 4-957-383-01 KNOB (F14) 1-670-018-11 SP SW BOARD
Remark
Ref. No.
* 65 66 67
* 68 69
Part No.
Description
1-670-017-11 4-900-565-01 4-900-491-01 1-670-023-11 4-951-620-01
SW BOARD INDICATOR (2) BUTTON (MUTE) ROTARY BOARD SCREW (2.6X8), +BVTP
* 70 71 72 73 74
A-4414-097-A DISPLAY BOARD, COMPLETE 1-773-163-11 WIRE (FLAT TYPE)(21 CORE) 1-769-961-11 WIRE (FLAT TYPE)(11 CORE) X-3375-588-1 ESCUTCHEON (WIN) ASSY 3-703-466-00 SPRING (6600)
75 76 77 * 78 79
4-942-568-41 4-900-577-01 4-900-576-01 1-670-024-11 4-999-431-01
EMBLEM (NO.5), SONY SPRING (1)(R) SPRING (1)(L) LED BOARD LENS, LED
* 80 * 81
FL101
4-921-941-01 CUSHION (FL) 4-990-797-01 HOLDER (FL) 1-517-781-11 INDICATOR TUBE, FLUORESCENT
Remark
70
4-3. CHASSIS SECTION
#2
108 103
T901
101
#2 Supplied with J701
113
112
111
not supplied
110
#2
not supplied 110
110
Q706 not supplied #2 #2
Q705
Q707 Q756
Q755
Q757
#2
114
#2
#2
109
#2
Q505 Q507
Q506
Q557
Q556 Q605 Q555 Q607 Q606
not supplied #2
115
#2
107 106
not
#2
#2
supplied
#2
#2
102
Supplied with #2 RV401
#2
104
#2
105
not supplied
#2
Ref. No.
* 101 * 102
103 * 104 * 105
Part No.
Description
1-670-006-11 1-670-021-11 4-900-386-01 1-670-020-11 1-670-019-11
H.P BOARD F-VIDEO BOARD SCREW BALANCE BOARD VOLUME BOARD
106 * 107 * 108
109 110
3-703-397-01 STOPPER, WIRING A-4414-095-A INPUT BOARD, COMPLETE 4-924-098-31 HOLDER, PC BOARD 1-773-285-11 WIRE (FLAT TYPE)(29 CORE) 3-905-609-11 SCREW (TRANSISTOR)
* 111 * 112 * 113 * 114 * 115
A-4414-112-A REAR AMP BOARD, COMPLETE 1-669-998-11 AC BOARD A-4414-109-A REG BOARD, COMPLETE A-4414-094-A AMP BOARD, COMPLETE 1-670-032-11 JOINT BOARD
Q505 8-729-209-15 TRANSISTOR 2SD2012
The components identified by mark ! or dotted
#2
line with mark ! are critical for safety.
Replace only with part number specified.
Remark
Ref. No.
Q506 Q507 Q555 Q556
Q557 Q605 Q606 Q607 Q705
Q706 Q707 Q755 Q756 Q757
! T901
Part No.
Description
8-749-010-25 IC MN2488-OPY-M 8-749-010-26 IC MP1620-OPY-M 8-729-209-15 TRANSISTOR 2SD2012 8-749-010-25 IC MN2488-OPY-M
8-749-010-26 IC MP1620-OPY-M 8-729-209-15 TRANSISTOR 2SD2012 8-749-010-25 IC MN2488-OPY-M 8-749-010-26 IC MP1620-OPY-M 8-729-209-15 TRANSISTOR 2SD2012
8-749-010-25 IC MN2488-OPY-M 8-749-010-26 IC MP1620-OPY-M 8-729-209-15 TRANSISTOR 2SD2012 8-749-010-25 IC MN2488-OPY-M 8-749-010-26 IC MP1620-OPY-M
1-431-889-11 TRANSFORMER, POWER
Remark
71