Yamaha ax 870

Page 1

STEREO INTEGRATED AMPLIFIER

AX-870

SERV CE 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 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
product to perfonn 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 i
appointed service representative '
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constimtc
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 reseatzh,
l 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 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
K / k apply power to the unit. /
I CONTENTS

TO SERVICE PERSONNEL........................................1 ADJUSTMENTS 5
REAR PANELS ...........1 PRINTED CIRCUIT BOARD.................................6~14
SPECIFICATIONS .. .2 tt-COM DATA ..... 15
BLOCK DIAGRAM .3 SCHEMATIC DIAGRAM. .16~17
INTERNAL VIEW .4 PARTS LIST .18~27
DISASSEMBLY PROCEDURES 4 REMOTE CONTROL TRANSMITTER..................,..28

V YAMAHA

1 O 0 4 61 A YAMAHA CORPORATION

P.O.Box1 .Hamamatsudaoan -
1.76K-904 [EGO [Printed in Japan 93.6

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AX-87 0

I TO SERVICE PERSONNEL

1. Critical Components Information.
Componems having special characteristics are marked and
must be replaced with parts having specifications equal 10
those originally installed.

I REAR PANELS

V A, B models

WALL
OUTLET

AC LEAKAGE
EQUIPMENT TESTER OR
UNDER TEST EQUIVALENT

INSULATING
TABLE

J:

B model

Q

gas-E a gas uh: i

o
o

DEB