Yamaha cd5050

Page 1

COMPACT DISC PLAYER

CDX-2020/1120/CD-5050

SERVICE MANUAL

IMPORTANT NOTICE I

This manual has been provided for the use of authorized Yamaha Retailers and their service personnel.
It has been assumed that basic service procedures inherant 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 all 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, certification or recognition of any applicable technical capabilities, or
establish a principle-agent relationship of any form.

The data provided is believed to be accurate 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. Modifications are, therefore, inevitable and specifications are subi2ct no change without notice or

obligation to retrofit. Should any discrepancy appear to exist, please Contact the distributors Service

Division.

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

IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before
you apply power to the unit.

I CONTENTS Egg
on
T0 SERVICE PERSONNEL . . .......... . . . . 1,2 BLOCK DIAGRAM . . . ......... . . . . . . . 26,27 8%
INTERLOCK OPERATION ................ 3 IC DATA Z.
DISENGAGING TRANSPORTATION LEVER. 3 LCD DATA. g
FRONT & REAR PANELS ......... . . . ..... 4 INTERCONNECT WIRING DIAGRAM . . . . . . . . 39 '
SPECIFICATIONS . . . ........ . . . . ....... 5 PRINTED CIRCUIT BOARD . . . . . ....... 40 ~45
INTERNAL VIEW ...... . ............... . 5 SCHEMATIC DIAGRAM ........ . . . . . . . 46 ~48
DISASSEMBLY PROCEDURES . .......... . . . 6 PARTS LIST ...... . . . . . . .......... . 49 ~ 66
ADJUSTMENTS ..................... 7~22 REMOTE CONTROL TRANSMITTER . . . . . . . . 67
TEST MODE . . . ......... . . ........ . 23~25
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CDX-2020/1120/CD-5050

I TO SERVICE PERSONNEL

1. Critical Components Information.
Components having special characteristics are marked and i
must be replaced with parts having specifications equal to \
those originally installed. I
l

2. Leakage Current Measurement (For 120V Model Only).
When service has been completed, it is imperative that you
verify that all exposed conductive surfaces are properly

insulated from supply circuits. WALL EOUIPM ENT AC LEAKAGE TESTER

OUTLET UNDER TEST 0R ECll-IIVALEN'I'

® 43- .

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

I Leakage current must not exceed 0.5mA.

0 Be sure to test for leakage with the AC plug in both E = I
polarities. INSU LATING J
TAB LE _ l

O POLARIZATION (U, C models)

This CD player product is equipped with a polarized alternating»
current line plug Ia plug having one blade wider than the other).
This plug will fit into the power outlet only one way. This is
a safety feature.

CAUTION HEREIN, MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

THE COMPACT DISC PLAYER SHOULD NOT BE ADJUSTED 0R REPAIRED BY ANYONE EXCEPT PROPERLY QUALIFIED
SERVICE PERSONNEL.

G, B models

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