Yamaha cdcs 90

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CD CHANGER

SERVICE MANUAL

CDC-$90 is the CD changer for COMPACT SYSTEM CC-7OS/W or (20-90.

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IMPORTANT NOTICE

This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service pmcedures inherent to the industry, and more specifically YAMAHA Products,
are already known and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in
personal injury, destruction of expensive components, and failure of the product to perform as
specified For these reasons, we advise all YAMAHA product owners that any service required
should be performed by an authorized YAMAHA Retailer or the appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization.
cenification or recognition of any applicable technical capabilities, orestablishaprinciple-agent
relationship of any form.

The data provided is believed to be acourate and applicable to the unit(s) indicated on the cover. The research.
engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifica-
tions are, therefore, inevitable and specifications are subject to change without notice or obligation to retrofit. Should
any discrepancy appear to exist, please contact the distributor's Service Division

WARNING: Static discharges can destroy expensive components Discharge any static electricity your body may
have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires
connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and pan replacement Recheck all work before you apply

\ power to the unit.

I CONTENTS

TO SERVICE PERSONNEL
REAR PANEL
SPECIFICATIONS

INTERNAL VIEW

BLOCK DIAGRAM ..............
DISASSEMBLY PROCEDURES .
TEST MODE... .......................... '

ERROR MESSAGES ........

ADJUSTMENTS

SYSTEM CONNECTOR CHECK. .14
STANDARD OPERATION CHART .15~16

4~5 IC BLOCK ...........
6~7 PRINTED CIRCUIT BOARD
...8 SCHEMATIC DIAGRAM ......
..................... ...........8 PARTS LIST27~36

YAMAHA

YAMAHA CORPORATION
P.O.Box1 ,Hamamatsu,Japan

3.2K-823 El®Printed In Japan 133.9

068-303

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C DC-SQD

I TO SERVICE PERSONNEL

1 Critical Components Information. AC LEAKAGE
Components having special characteristics are marked and WALL EQU|PMENT TESTEFI on
must be replaced with pans having specifications equal to OUTLET UNDER TEST EQUIVALENT
those originally installed. '

2. Leakage Current Measurement (For 120V Models Only). ® :ID
When service has been completed, it is imperative to verify
that all exposed conductive surtaces are properly insulated =
from supply circuits. INSULATING

' TABLE

0 Meter impedance should be equivalent to 1500 ohm
shunted by 0.15pF.

o Leakage current must not exceed 0.5mA.

0 Be sure to test lor leakage with the AC plug in both
polarities.

CAUTION: USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

THE COMPACT DISC PLAYER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLY
QUALIFIED SERVICE PERSONNEL.

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING

This set employs a laser. Therefore, be sure to carefully
follow the instructions below when servicing .

1. Laser Diode Properties 2. When checking the laser diode emission, keep your
0 Material : GaAlAs ' eyes more than 30 cm away from the objective lens.
0 Wavelength : 780 nm
0 Emission Duration : Continuous
0 Laser Output : max. 44.6 uW

' This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the Optical Pick-up Block.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic
and/or plastic (where applicable) components may also contain traces of chemicals found by the
California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects
or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOURMOUTH
FOR ANY REASON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale
solder fumes or expose eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash
your hands before handling food.