Yamaha rx v493

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AV RECEIVER

RX-V393IR-V503
RX-V493IR-V703

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 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 personalrinjury. destruction of expensive components, and failure of the
product to perform 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
appointed service representative.

IMPORTANT: The presentation or sale of this manual 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 distributors 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.

I CONTENTS

TOSERVICEPERSONNEL 1 DISPLAVDATA.. ....... 18
FRONTPANELS............... ...........2 ICDATA...... ....... .......19~22
REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . .3~4 RX-V393/R-V503 PRINTED CIRCUIT BOARD . .24~35
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . .5~6 RX-V493/R-V703 PRINTED CIRCUIT BOARD . .36~47
INTERNAL VIEW . . .-. ............. . ........... 7 BLOCK DIAGRAM . . . .......... . . . . . . . . . . .48~50
DISASSEMBLY PROCEDURES . . . . . . . ........ 7~8 PIN CONNECTION DIAGRAM . . . . . . . . . ........ 51
SELF CHECK MODE . . . . . . . . . . . . . . .9~11 RX-V393/R-V503 SCHEMATIC DIAGRAM . . . . .52~55
PROTECTION OPERATION CHECK FUNCTION . .12 RX-V493/R-V703 SCHEMATIC DIAGRAM . . . . .56~59
AMPADJUSTMENTS ..... ..............13 PARTSLIST. ........ ...60~82
TUNER ADJUSTMENTS . . . . . . ........ . . . . .14~17 REMOTE CONTROL TRANSMITTER . ........ 83~84

Copyright 2003 YAMAHA CORPORATION
1 0° 61 0 This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission. 3%)fi ORPOE AT ON

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nx-v393/n-V503/Rx-V493/R-v703

I TO SERVICE PERSONNEL i;

1. Critical Components Information. I
Components having special characteristics are marked A AC LEAKAGE
and must be replaced with parts having specifications equal WALL EQUIPMENT TESTER 0H
to those originally installed. OUTLET UNDER TEST EQU'VALENT .

2. Leakage Current Measurement (For 120V Models Only). ® D- .
When service has been completed, it is imperative to verily I :
that all exposed conductive surfaces are properly insulated _
from supply crrcurts. INSULATING

TABLE

0 Meter impedance should be equivalent to 1500 ohm shunted
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.

"CAUTION"
F1 01 2 FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, FtEPLACE ONLY WITH SAME TYPE 5.0A, 125V FUSE."
LA_V

CAUTION
F101 : REPLACE WITH SAME TYPE 5.0A, 125V FUSE. I

ATTENTION (
F101 :UTlLlSER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 5.0A, 125V.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or
plastic (where applicable) components may also contain traces of chemicals iound by the California Health and
Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR
ANY REASON WHATSOEVER! r

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes
or expose eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands
before handling food. ,

/
WARNING \
Do not change the IMPEDANCE SELECTOR switch
setting while the power to this unit is on, otherwise
this unit may be damaged.

IMPEDANCE SELECTOR

Manulactured under license from Dolby Laboratories Licens- /
ing Corporation. "Dolby", "Pro Logic", and the double-D
symbol DU are trademarks of Dolby Laboratories Licensing .
Corporation. \ )

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RX-V493lR-V703