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STEREO CONTROL AMPLIFIER

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SERVICE MANUAL

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IMPORTANT NOTICE

'I'hit manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
it has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA
Products. are already knawn and understood by the users. and have therelnre not been restated.

WARNING: Failure to follow appruptiate 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 ur firm dues not cunstitute authoriza-
tion, certification or recognition of any applicable technical capabilities. at establish a
principle-agent relationship of any form.

The data provided is believed in be aCCumtn and applicable to the unit(s) indicated on the covert The reseaclr,
engineering. and service departments of YAMAHA are continually striving lo 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 distributors 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: Tum the unit OFF during disassembly and part replacement. Recheck all work before you apply

power to the unit.

I CONTENTS

TO SERVICE PERSONNEL ........... uCOM DATA .................
REAR PANELS ........................................... IC BLOCK ....................................
SPECIFICATIONS TEST POINT WAVEFORMS .......

BLOCK DIAGRAM
INTERNAL VIEW...
DISASSEMBLY PROCEDURES
PRINTED CIRCUIT BOARD ................................... 6~13

SCHEMATIC DIAGRAM ....................
REMOTE CONTROL TRANSMITTER
PARTS LIST ......................................

1 0 0 4 5 8 YAMAHA CORPORATION

O.Box1 .Hamamaisu.JaDan

3.05K-203 in $3 Printed in Japan 93%

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I TO SERVICE PERSONNEL

1. Critical Components Intormation.

AC LEAKAGE
TESTER 0R
EQUIVALENT

Components having special characteristics are marked and WALL EQU|PMENT
must be replaced with parts having specifications equal to OUTLET UNDER TEST
those originally installed.

2. Leakage Current Measurement (For 120V Models Only). 03 D
When service has been completed, it is imperative to verily

that all exposed conductive surfaces are properly insulated
from supply circuits. INSULATING
TABLE

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

o Leakage current must not exceed 0.5mA.

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

WARNING: CHEMICAL CONTENT NOTICE!

Er.

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!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale

solder fumes or expose eyes to solder/flux vapor!

It you come in contact with solder or components located inside the enclosure of this product, wash

your hands before handling food.