Yamaha av 66 yst

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STEREO AMPLIFIER

AV- 65/6 GYST

' SER EMANU

.LSAQQ/SQ'AV

/ IMPORTANT NOTICE \

This manual has been provided for the use of authorized YAMAHA Retailem and their service personnel.
It has been assumed that basic service procedures inhemnt 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
mny 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 perfmmed by an authorized YAMAHA Retailer or the
appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or film does not constitute
authorization, certification or recogtition of any applicable technical capabilities, or
establish a principle-agent relutianxbip of any form.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover 'Rie rescrch.

engineering, and service departmens of YAMAHA are continually striving to improve YAMAHA products,

Modifications are, thereforefi inevitable and specifications are subject to change without notice or obligation to

retrofit, Should any discrepancy Ippcar 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 distssembly and pans replacement, Recheck all wont before you
apply powa to the unit. /

I CONTENTS

TO SERVICE PERSONNEL . 1 IC DATA ............................
INTERNAL VIEW .................. .1 PRINTED CIRCUIT BOARD

PANEL CONTROLS .2 SCHEMATIC DIAGRAM ...................
SPECIFICATIONS.... 3 INTERCONNECT WIRING DIAGRAM
BLOCK DIAGRAM ................... 4 PARTS LIST ........................................
DISASSEMBLY PROCEDURES REMOTE CONTROL TRANSMITTER

ADJUSTMENTS .............................................................. 5

. ' . - YAMAHA

YAMAHA CORPORATION
PO Box 1, Hamamatsu. Japan

1.5K-975 It! [Printed in Japan 90. 3

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AV-65I66YST

I TO SERVICE PERSONNEL

1. Critical Components Information.

Components having special characteristics are marked AC LEAKAGE '
and must be replaced with parts having specifications WALL EQUIPMENT TESTER 0R
equal to those originally installed. OUTLET UNDER TEST EQUIVALENT
2. Leakage Current Measurement (For 120V Model Only). 1 )-
When service has been completed, it is imperative that ®
you verify that all exposed conductive surfaces are prop- I
erly insulated from supply circuits. _
0 Meter impedance should be equivalent to 1500 chm [asBlflEA-HNG

shunted by 0.15uF.
O POLARIZATION W, C models only)

0 Leakage current must not exceed 0.5mA.

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

This amplifier product is equipped with a polarized alter»
hating-current line plug (a plug having one blade wider
than the other). This plug will fit into the power outlet
only one way This is a safety feature.

I INTERNAL VIEW ' I

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0 POWER TRANSFORMER

0 MAIN CIRCUIT BOARD (2)

6 MAIN CIRCUIT BOARD (1)

0 u-COM CIRCUIT BOARD (9)

6 u-QOM CIRCUIT BOARD (1)

6 MAIN CIRCUIT BOARD (4) : AV»66YST only
0 p-COM CIRCUIT BOARD (3)