Yamaha avc 34

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STEREO AV AMPLIFIER

AVC-30/3OU/AV-34

SERVICE MANUAL

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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 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
precinct 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 tiIisAmanual 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 subject to change without notice or
obligation to retrofit, Should any discrepancy appear to exist, please contact the distributor's Service
Division.

WARNING: Static discharge; can destroy expensive components Discharge any static electricity your
body may have accumulated. by grounding yourself to the wound 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

TOSERVICEPERSONNEL.................1 ADJUSTMENTS
FRONTPANELS.........; ............ ..1 ICBLOCK
REARPANELS ........ ................2l3 PRINTEDCIRCUITBOARD
SPECIFICATIONS...................... 4 WIRING.. .....
BLOCK DIAGRAM .. 5 SCHEMATICDIAGRAM........ 16/17
INTERNALVIEW 5 RS-AVC30REMOTE CONTROLTRANSMITTER..18
DISASSEMBLYPROCEDURES........ . 6 PARTSLIST.......................19~29

SINCE 1837

YAMAHA

NlPPON GAKKI CU.. LTD. HAMAMATSU, JAPAN
3.3K-881 (9 Printed in Japan 87.2

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AVC-30/3OU/AV-34

I TO SERVICE PERSONNEL

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

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.

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

o Leakage current must not exceed 0.5mA.

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

I FRONT PANELS

o AVG-30

AC LEAKAGE TESTER
OR EQUIVALENT

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INSULATING TABLE

EQUIPMENT
UNDER TEST

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OUTLET

I POLARIZATION (U, C model: only) -
This tuner product is equipped with a polarized alternating-
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.

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