Aiwa NSX-BL54 / NSX-BL56 Service Manual

This document provides comprehensive service information for the Aiwa NSX-BL54 and NSX-BL56 Compact Disc Stereo Systems.

System Overview

The Aiwa NSX-BL54 and NSX-BL56 are compact disc stereo systems designed for high-quality audio playback. They feature a cassette deck, a compact disc player, and a stereo amplifier, along with compatible speaker systems (SX-WNBL53, SX-WNBL56) and remote controllers (RC-ZAS01).

Specifications

Main Unit (CX-NBL54, CX-NBL56):

FM Tuner Section: Tuning range 87.5 MHz to 108 MHz, Usable sensitivity (IHF) 16.8 dBf (EZ, K), 13.2 dBf (HS, HR), Antenna terminal 75 ohms (unbalanced).
AM (MW) Tuner Section: Tuning range 531 kHz to 1602 kHz (9 kHz step) or 530 kHz to 1710 kHz (10 kHz step), Usable sensitivity 350 µV/m, Antenna Loop antenna.
LW Tuner Section (EZ, K): Tuning range 144 kHz to 290 kHz, Usable sensitivity 1400 µV/m, Antenna Loop antenna.
SW Tuner Section (HR): Tuning range 5.730 MHz to 17.900 MHz, Antenna Wire antenna.
Amplifier Section:
- Mid-high frequency amplifier Power output: Rated 20 W + 20 W (8 ohms, T.H.D. 1%, 1 kHz/DIN 45500), Reference 25 W + 25 W (8 ohms, T.H.D. 10%, 1 kHz/DIN 45324), DIN MUSIC POWER: 40 W + 40 W (EZ).
- Total harmonic distortion: 0.1% (10 W, 1 kHz, 8 ohms, DIN AUDIO).
- Low frequency amplifier Power output: Rated 60 W + 60 W (6 ohms, T.H.D. 1%, 130 Hz/DIN 45500), Reference 75 W + 75 W (6 ohms, T.H.D. 10%, 130 Hz/DIN 45324), DIN MUSIC POWER: 130 W + 130 W (EZ).
- Total harmonic distortion: 0.1% (30W, 130 Hz, 6 ohms, DIN AUDIO).
Inputs: VIDEO/AUX: 500 mV, MIC: 1.0 mV (10 k ohms) (HS, HR).
Outputs: SPEAKERS HIGH FREQ: accepts speakers of 8 ohms or more, SPEAKERS LOW FREQ: accepts speakers of 6 ohms or more, SURROUND SPEAKERS: accepts speakers of 8 ohms to 16 ohms, PHONES (stereo jack): accepts headphones of 32 ohms or more.

Cassette Deck Section:

Track format: 4 tracks, 2 channels stereo.
Frequency response: 50 Hz - 15000 Hz.
Recording system: AC bias.
Heads: Deck 1: Playback head x 1, Deck 2: Recording/playback head x 1, erase head x 1.

Compact Disc Player Section:

Laser: Semiconductor laser (λ = 780 nm).
D-A converter: 1 bit dual.
Signal-to-noise ratio: 85 dB (1 kHz, 0 dB).
Harmonic distortion: 0.05% (1 kHz, 0 dB).
Wow and flutter: Unmeasurable.

General:

Power requirements: 220 V AC, 60 Hz (HS), 230 V AC, 50 Hz (EZ, K), 120 V/220-230 V/240 V AC switchable, 50/60 Hz (HR).
Power consumption: 150 W.
Power consumption in standby mode: ECO OFF: 20 W, ECO ON or ECO AUTO: 0.9 W.
Dimensions of main unit (W x H x D): 260 x 326 x 345 mm.
Weight of main unit: 9.0 kg.

Speaker System (SX-WNBL53, SX-WNBL56):

Type: 3 way, Built-in subwoofer (magnetic shielded type).
Speaker units: Subwoofer: 160 mm cone type, Full range: 100 mm cone type, Super tweeter: 20 mm ceramic type.
Impedance: 6 ohms/8 ohms.
Sensitivity: 87 dB/W/m.
Dimensions (W x H x D): 230 x 324 x 282 mm.
Weight: 4.8 kg.

Note: Design and specifications are subject to change without notice. The word "BBE" and the "BBE symbol" are trademarks of BBE Sound, Inc. Under license from BBE Sound, Inc.

Safety Precautions

Protection of Eyes from Laser Beam During Servicing:

This set employs a laser. Follow instructions carefully when servicing.
WARNING: Do not approach the laser exit with the eye too closely. Observe from a distance of more than 30cm from the surface of the objective lens on the optical pick-up block.
Caution: Invisible laser radiation when open and interlocks defeated. Avoid exposure to beam.
ATTENTION: Use of controls or adjustments other than specified may result in hazardous radiation exposure.
VAROITUS! (Finnish) Use other than specified may expose user to invisible laser radiation exceeding Class 1 limits.
VARNING! (Swedish) Use other than specified may expose user to invisible laser radiation exceeding Class 1 limits.
Precaution to replace Optical block: Body or clothes electrostatic potential could ruin the laser diode. Ground body and workbench, and use care the clothes do not touch the diode.

Repair Procedures

1. Forced Discharge of Electrolytic Capacitor of Power Supply Block:

Before repair, discharge electrolytic capacitors (C101, 102) to prevent secondary defects.
Discharge procedure: Remove AC power cord. Connect a discharging resistor between the positive (+) and negative (-) terminals of the capacitors for two seconds. Check voltage across capacitors has decreased to 1 V or less.
Refer to the table for appropriate discharging resistors based on charging voltage.

2. Check Items Before Exchanging the Microcomputer:

2-1. Regarding the HOLD terminal of the MICROCOMPUTER: Check the HOLD terminal voltage. If it is "L", the main power cannot be turned on. Abnormalities in the power amplifier circuit can also set the HOLD terminal to "L".
2-2. Regarding reset: If the machine does not work correctly due to the microcomputer not resetting, perform a forced-reset. Remove AC power cord, short the electrolytic capacitor C113 connected to VDD of the microcomputer, and reconnect the AC power cord. If the microcomputer returns to normal operation, it is functioning correctly.
2-3. Confirmation of soldering state of MICROCOMPUTER: Check the soldering state of the microcomputer to ensure it is not the cause of the fault.

Parts Lists

Detailed parts lists are provided for the main unit, speakers, and various circuit boards (IC, Transistor, Diode, Capacitors, etc.). These lists include part numbers, reference numbers, and descriptions.

Schematics and Wiring Diagrams

The document includes detailed schematic diagrams and wiring diagrams for the Main C.B, Front C.B, Tuner Section, and Deck Section, illustrating component placement and interconnections.

Adjustment Procedures

Specific adjustment procedures are outlined for various sections, including:

Tuner Section: Clock frequency check, AM VT check, LW VT adjustment, FM VT check, MW tracking adjustment, LW tracking adjustment, FM tracking check, AM IF adjustment, DC Balance/Mono Distortion adjustment.
Deck Section: Tape speed adjustment, Head azimuth adjustment, PB frequency response check, PB sensitivity check, REC/PB frequency response adjustment, REC/PB sensitivity check.
Front Section: µ-CON OSC adjustment.

Mechanical Exploded Views

Exploded views of the mechanical components are provided for the main unit and the mechanism, illustrating the assembly and disassembly of parts.

Chip Resistor Part Coding

Information on how to interpret chip resistor part codes is included, showing the relationship between the code, resistance value, and dimensions.

Transistor Illustration

Illustrations of common transistors used in the system are provided with their pin configurations.

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