Yamaha rx 750

Page 1

I CONTENTS

TO SERVICE PERSONNEL ..

STEREO RECEIVER
RX-750
SERVICE MANUAL
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/ IMPORTANT NOTICE V

This manual has been provided for the use of Iulhonzed YAMAHA Retailers 1nd lheix service penannel.
IL Ins been sun-led lhu basic service procedures inhmnl lo the industry. Ind more specifically YAMAHA
Producu. are Ikeady known Ind undaslood by the users, and hive therefore not been mauled.

WARNING: Failure to follow approprille service And safely procedures when servicing this product
may result in persenrl injury, desmxcljon of expenswe componenu, Ind failure of the
pmducl. lo perinnn ls specified. For Lhesexeasons, we Idvise all YAMAHA product owners
lhal lny rerviee required should be perfmmed by In Iulhorized YAMAHA Reuiler m the

lppoinled service represenulivc.

IMPORTANT: The presentation 01 sale of thir manual to my individn-I or film dues not constitute
tuthorization, certification ox ruoyiiltion of lny tpplierble technieil crpahditier, or
erublirh r pnneiple-rgent relationship of my form.

The dau provided is believed lo be Iccunle .nd applicable lo the unit(t) indiened an the cover. The much.
cngIneexing, and smice deptnrnentr of YAMAHA .re continually striving lo improve YAMAHA pmducls.
Modifiuvions ire. therefore, ineviuble Ind rpeeirrertinns ire subjecl In Chung: without notice or obligation la
mode Should my discrepancy lppu! lo exist, plane cont-ct the dieribquxs Service Divismn.

WARNING: smic dischzxges can desuuy expensive components. Dischuge any stalic electricity your
body rnry hive accumulated by grounding yourself In the ground busr in the urit (heavy
gauge black wires connect to this buss).

IMPORTANT: Tum the unit on: during diszssembly Ind pm replacement. Recheelr all work before you

upply power to lhc unit.

PRINTED CIRCUIT BOARD ................

REAR PANELS ................... INTERCONNECT WIRING DIAGRAM
SPECIFICATIONS. DISPLAY DATA .

INTERNAL VIEW... H-COM DATA .....

DISASSEMBLY PROCEDURES .............................. FRONT END PACK .....

ADJUSTMENT IN POWER AMPLIFIER SECTION
ADJUSTMENT IN TUNER SECTION ..
TEST MODE ..........
BLOCK DIAGRAM

SCHEMATIC DIAGRAM ..
PARTS LIST .
REMOTE CONTROL TRANSMITTER.

YAMAHA

YAMAHA CORPORATION
0..Box1 Harnamatsu. Janan

2.65k'354 fie al 3

Page 2

RX-750 RX-750

I TO SERVICE PERSONNEL

1. Critical Components Infant-ration. Ac LEAKAGE v R model
Components having special characteristics are marked m1 WALL EQUIPMENT TESTER on
my be mum Wm. m min speculum, 91} w OUTLET UNDER TEST EQUIVALENT Q
thus: originally insulted. a o
2. Leahge current Measurement (For my Models cum. '2
When sevvice has been completed, it is imperative to verily i- _= ___

that all exposed eonmxm surfaces :ri properly imulatod
tram supply muss. INSULA'nNc

. Meier impedance should be equivalent to \500 ohm shunted

0-000-"2171'; e

V 5:- . Pouniznnon (u, c mod-ls only) °_, - ©-© @MQ) @ g
. Leakage current must not exceed 0.5m. The mew product is equipped with a polarized aliemat- t...- ..__
Ing-uurront ma plug (a plug having one blade wider than the
0 Be SUN 0 I55! for leakage with the AC plug in both 5MP). Thifi plug will til into the POW outlet oniy 0M way.
DOIInliBS. This ii a SIM mature.

WARNING: CHEMICAL CONTENT NOTICE! VAmode

The solder used in the production at this product contains LEAD, In addition, other electrical/electronic
and/or plastic {where applicable) components may also contain traces of chemicals tound by the
California Health and Wellare Agency (and possibly other entities) to cause cancer and/or birth defects . "E
- g;
0
S

or other reproductive harm,

2- . . , , . .
A a
DO NOT PLACE SOLDER, ELECTRXCAL/ELECTRONIC on PLASTIC COMPONENTS lN voun @© @©

MOUTH FOR ANY REASON WHATSOEVER!

o- -....

Avoid prolonged. unprotected contact between solder and your skin! When soldering, do not Inhale sol-
der lumes or expose eyes to solder/flux vapor!

it you come in contact with solder or components located inside the enclosure 01 this product, wash
your hands bstore handling tood.

V B model

I REAR PANELS

V U model

i:

Aka-EA W_ _ i

To liiw
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