Yamaha cx 2

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STEREO CONTROL AMPLIFIER

SERVICE MANUAL

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o U, C, R models 0 A, B, G models

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C? O Q C? WARNING:

IMPORTANT: The presentation or sale of this manual to any individual or firm does not

The data provided is believed to be accurate and applicable to the unit(s) indicated on the
"'- cover. The reseach. engineering, and service departments of YAMAHA are continually
striving to improve YAMAHA products. Modifications 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.

k-J WARNING:

mm
W... Hill ' ' ' ' .
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all

r f g-1 IMPORTANT NOTICE
b W m 65 This manual has been provided for the use of authorized YAMAHA Retailers and their
mm-9.... l w... . . service personnel.
9 E C) C) (lej It has been assumed that basic service procedures inherent to the industry. and more spe-
all: [:1 DE] 66 "0'6 cifically YAMAHA Products, are already known and understood by the users, and have
m 4...... .4 no W... .4... therefore not been restated.

Failure to follow appropriate service and safety procedures when servic-
ing 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 re-
quired should be performed by an authorized YAMAHA Retailer or the
appointed service representative.

constitute authorization, certification or recognition of any applicable
technical capabilities, or establish a principle~agent relationship of any
form.

Static discharges can destroy expensive components. Discharge any static

electricity your body may have accumulated by grounding yourself to the
ground buss tn the unit (heavy gauge black wrres connect to TRIS buss)

k work before you apply power to the unit. J
I CONTENTS
TO SERVICE PERSONNEL ........ 1 BLOCK DIAGRAM ................................................ 12~13
REAR PANELS ....................... .......... ..2 u-COM DATA ............................................................... 14
SPECIFICATIONS ..... .. ...... 3 IC BLOCK ...................................................... . ............. 15
INTERNAL VIEW 4 SCHEMATIC DIAGRAM ....................................... 16~17
DISASSEMBLY PROCEDURES 4 PARTS LIST .......................................................... 18~27
PRINTED CIRCUIT BOARD 5~11 REMOTE CONTROL TRANSMITTER .............. ....28~30
100459 YAMAHA CORPORATION

P. O. Box1 .Hamamatqu aoan
3.05k- l03 fl @Printed in Japan '93.5

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I TO SERVICE PERSONNEL

1.

Critical Components Information.

Components having special characteristics are marked and
must be replaced with parts having specifications equal to
those originally installed.

Leakage Current Measurement (For 120V Models Only).
When sen/ice has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.

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

Leakage current must not exceed 0.5mA.

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

WALL EQUIPMENT
OUTLET UNDER TEST
INSULATING
TABLE

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 YOUR MOUTH
FOR ANY REASON WHATSOEVER!

AC LEAKAGE
TESTER OR
EQUIVALENT

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.