Yamaha dsp a492

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ZGVV'dSCI

AV AMPLIFIER

DS P-A492

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 inhermt to the industry and more specifically YAMAHA
Products, are aiready known and understood by the users, and have thercfore 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 specified, For these reasons we advise all YAMAHA pmdua owners
that all service required should be perfomted by an authorized YAMAHA Retailer or the
appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or firm does not canstltute
authorization, certification or recognition of any applicable technical Capablitlfist 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 escarch.
engineering. and service departments of YAMAHA are continually striving to improve YAMAHA products.
Modifications are, therefore. inevitable and specifications are subjccl to change without notice or obligation to
retrofit. Should any discrepancy appear to cxist. please contact the distributors Service Division

, WARNING: Static discharges can destroy expensive components. Discharge any static electririty your
body may have accumulated by grounding yourself to m: ground buss in the uni (heavy
gauge black wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and pans replacementt Recheck all work More you

\\ apply power to the unit.

I CONTENTS

TO SERVICE PERSONNEL 1 DISPLAY DATA

FRONT PANEL .1 IC DATA ..

REAR PANELS 2 PIN CONNECTION DIAGRAM

SPECIFICATIONS .. 3 PRINTED CIRCUIT BOARD ..

INTERNAL VIEW 4 BLOCK DIAGRAM ......

DISASSEMBLY PROCEDURES ........... 4~5 SCHEMATIC DIAGRAM ...................... .,. . 28~30
SELF CHECK MODE ................................. ...... 6~8 PARTS LIST ................................... . . 31~41
PROTECTION OPERATION CHECK FUNCTION 8 REMOTE CONTROL TRANSMITTER ............... ._ ....... 42
ADJUSTMENTS ............................................................. 9

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DSP-A492

DSP-A492

I TO SERVICE PERSONNEL

Critical Components lnlormation.

Components having special characteristics are marked and must
be replaced with parts having specifications equal to those origi-
nally installed.

I FRONT PANEL

WALL
OUTLET

AC LEAKAGE
EQUIPMENT TESTER OR
UNDER TEST EQUIVALENT

4-

INSULATING
TABLE

YAIIAIIA mmmLsouMu mm mm? m 1:. . "3

-POWER

gsrscv mmmiwmcmmmm mmuu Moo mm

mm

muss svemens BASS mm: :5ch
A a

2 l-l lul

W, , a z x z ,

© :IEI = =3 =
WW, . . . . . .

_ m .meE 55

49mm> Exam mm

to. mm mm

(WARNING

Do not change the lMPEDANCE SELECTOR switch
setting while the power to this unit is on, otle rwise
this unit may be damaged.

\

IMPEDANCE SELECTOR

-m.-®

-SFEAKERS