Sanyo DC-DA90 - User Manual

Service Manual
FILE NO.
Micro Component System
DC-DA90 (SP)
PRODUCT CODE No.
129 620 02
REFERENCE No.
SM5810260
SP: This service manual consists of "DC-DA90U/SP" (Main unit : 129 619 02) and
"SX-DA90/SP" (Speaker system : 165 045 00).
Contents
Specifications ................................................................... 1
System connections ......................................................... 1
What to do if ..................................................................... 1
Laser beam safety precaution .......................................... 2
CD pick-up maintenance .................................................. 2
CD player adjustments ..................................................... 2
Tape adjustments ............................................................ 3
Tuner adjustments ........................................................... 4
Exploded view
(Cabinet & Chassis) ...................................................... 5
Parts list
(Cabinet & Chassis) ...................................................... 6
(Tape mechanism) ........................................................ 9
(CD mechanism) ........................................................... 9
IC block diagram & description ........................................ 10
LCD display description ................................................... 14
Wiring connection ............................................................ 15
Schematic diagram
(FRONT) ....................................................................... 16
(CD)............................................................................... 18
(TUNER) ....................................................................... 22
(AMPLIFIER ) ................................................................ 26
Wiring diagram
(FRONT & CD) .............................................................. 20
(TUNER) ....................................................................... 24
(AMPLIFIER) ................................................................. 28
(POWER TRANSFORMER & LED) .............................. 30

Summary

Product Specifications

System Connections

Troubleshooting Guide

Laser Beam Safety Precaution

CD Pick-up Maintenance

CD Player Adjustments

Tracking Balance Adjustment

Procedure to adjust the tracking balance using an oscilloscope.

CD Player Adjustments (Continued)

Eye Pattern Check

Procedure to check and verify the CD player's 'eye' pattern.

Tape Adjustments

Head Adjustments and Motor Speed

Tuner Adjustments

FM and AM Tuning Procedures

Steps for FM and AM alignment, cover voltage, and tracking adjustments.

IC Block Diagrams and Descriptions

Key ICs: CD Driver, FM Front End, Power Amplifier

Block diagrams and descriptions for CD Driver, FM Front End, and Power Amplifier ICs.

Other ICs: Preamplifier, Volume Control

IC Block Diagrams and Descriptions (Continued)

Servo Signal Processor IC (LA9241 ML)

Pinout and function description for the Servo Signal Processor IC.

Digital Signal Processor IC (LC78622 NE)

Pinout and function description for the Digital Signal Processor IC.

Micro Processor IC (LC72336-9 A38)

Pinout and function description for the main Micro Processor IC.

Tuner System IC (LA1844 ML)

Wiring Connection Diagram

Schematic Diagram (Front)

Microprocessor and LCD Connections

Schematic Diagram (CD)

Servo, Digital, and CD Driver IC Schematics

Wiring Diagram (Front & CD)

Schematic Diagram (Tuner)

FM Front End and Tuner System IC Schematics

Schematic Diagram (Amplifier)

Preamplifier, Volume, and Power Amplifier IC Schematics

Sanyo DC-DA90 Specifications

General

Brand	Sanyo
Model	DC-DA90
Category	Stereo System
Functions	CD Player, Cassette Deck, Radio
Tuner Bands	AM/FM
CD Player	Yes
Cassette Deck	Yes
Tuner	Yes
Remote Control	Yes
Speakers	Included