Yamaha rx 770

Page 1

STEREO RECEIVER

RX- 770

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 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 (his 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 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, cenificalion or recognition of any applicable technical capabilities, or
establish a principlevagent relationship of any form.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The reseach,
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 me distributors Service Division

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your
REIII body may have accumulated by grounding yourself to the ground huss in the unit (heavy
gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Reeheck all work before you
I CONTENTS

\\ apply power to the unit. /

TO SERVICE PERSONNEL . ..1 DISPLAY DATA
REAR PANELS .1~2 tt-COM DATA.
SPECIFICATIONS ............ 3~4 TEST POINT WAVEFORMS.

INTERNAL VIEW . ........ . .....
DISASSEMBLY PROCEDURES ..
ADJUSTMENT IN POWER AMPLIFIER SECTION
ADJUSTMENT IN TUNER SECTION.
TEST MODE
BLOCK DIAGRAM ..

PRINTED CIRCUIT BOARD
FRONT END PACK
IC BLOCK
SCHEMATIC DIAGRAM
PARTS LIST.
REMOTE CONTROL TRANSMITTER .

Copyright 2003 YAMAHA CORPORATION
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.

YAMAHA CORPORATION
P..O Boxl .Hamamatsu Jaoan

2.5K~314 IE 6) Printed In Japan 933

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RX-770

RX-770

I TO SERVICE PERSONNEL

1. Critical Components Information. AC LEAKAGE
Components having special characteristics are marked and WALL EQUIPMENT TESTER on
must be replaced with pans having specifications equal to OUTLET UNDER TEST EQUIVALENT
those originally installed.

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

TABLE

0 Meter impedance should be equivalent to 1500 ohm shunted
by 0.15pF.

c Leakage current must not exceed 0.5mA.

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

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 found 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!

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

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

I REAR PANELS

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