Yamaha A-S300 Service Manual

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-S50

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SERVICE MANUAL

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 inherent to the industry, and more specifi cally 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 specifi ed.  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 or fi rm does not constitute authorization, certifi cation 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 

specifi cations are subject to change without notice or obligation to retrofi t.  Should any discrepancy appear 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 disassembly and part replacement.  Recheck all work before you apply power to the unit.

■ CONTENTS

TO SERVICE PERSONNEL  ............................................2

IMPEDANCE SELECTOR  ...............................................3

FRONT PANELS  .............................................................3

REAR PANELS  ...........................................................4–8

REMOTE CONTROL PANEL  ..........................................9

SPECIFICATIONS / 参考仕様  ................................... 9–10

INTERNAL VIEW  .......................................................... 11

SERVICE PRECAUTIONS / サービス時の注意事項  ..... 11

DISASSEMBLY PROCEDURES / 分解手順  ........... 12–15

UPDATING FIRMWARE /

ファームウェアの書き込み  ..................................... 16–20

SELF-DIAGNOSTIC FUNCTION / 

ダイアグ（自己診断機能）  .......................................21–27

AMP ADJUSTMENT / アンプ部調整  .......................28–29

IC DATA  ...................................................................30–32

PIN CONNECTION DIAGRAMS  .............................33–34

BLOCK DIAGRAM  ........................................................35

PRINTED CIRCUIT BOARDS  .................................36–52

SCHEMATIC DIAGRAMS  .......................................53–61

REPLACEMENT PARTS LIST  ................................63–79

REMOTE CONTROL  .....................................................80

INTEGRATED AMPLIFIER

'10.09

P.O.Box 1, Hamamatsu, Japan

Copyright © 2010 

 All rights reserved.

This manual is copyrighted by YAMAHA and may not be copied or

redistributed either in print or electronically without permission.

A-S500/A-S300