Yamaha ax 750

Page 1

STEREO INTEGRATED AMPLIFIER

AX-750

SERVICE MANUAL

I FRONT PANEL

/ IMPORTANT NOTICE \

This manual has been provided for the use of authorized YAMAHA Radius and their service persmnei.
It has been Assumed that basic service procedures inherent lo the industry, and more specifically YAMAHA
Products. Are zlready known and undeastood by the usels, and have Iherefme not been muted.

WARNING: Failure :0 follow Ippwpriam 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 reascms, we advise all YAMAHA product owners
that any service required should be performed by m Iutholized YAMAHA Retailer or the
appointed service representative

IMPORTANT: 'Dtc pmenution or sale of this manual to any individual or finn does no! constinne
authorization, certification or recognition of Any applicable technical liabilities. or

I establish a prhcipleageut relationship of any form.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover, The research,

enp'neering, and service departments of YAMAHA are continually ruiving lo improve YAMAHA products.

Modifications are. madam, inevitable and specifications are subject to change without notice or obligation to

nuoflL Should any discrepancy appear to exist, please comm the distributors Service Division.

WARNING: Static discharges can dismay expensive components. Discharge any static electricity your
body may have rccumulutcd by grounding yourself to the ground bus in the unit (heavy
gauge black wires (:0me to this buss).

IMPORTANT: Turn the unit OFF during disassembly and pan replacement, Recheck all work before you

. apply power to the unit, /

I CONTENTS

TO SERVICE PERSONNEL
REAR PANELS"
SPECIFICATIONS
DIMENSIONS
INTERNAL VIEW .........
DISASSEMBLY PROCEDURES

ADJUSTMENTS...
2 BLOCK DIAGRAM

.3 WIRING

.3 PRINTEDCIRCUIT BOARD
4

4

SCHEMATIC DIAGRAM
PARTS LIST
REMOTE CONTROL TRANSMITTER....... ....................... 25

, YAMAHA

YAMAHA CORPORATION
HAMAMATSU. JAPAN

2.4K-693 [U (5) Printed in Japan 913

OQLXV

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Ax-750

ITO SERVICE PERSONNEL

I Critical Components Information !

Components having special characteristics are marked A
and must the replaced with parts having specifications equal to ESSEIIDRMTEE'é; ACO'iREEglfiEAIEfil-IFR
those originally installed.
2. Leakage Current Measurement (For 120 V Model Only).
_When service has been completed. it is imperative that you
verify that all exposed conductive surfaces are properly
insulated from supply circuits.
- Meter Impedance should be equivalent to 1500 ohm shunted by . INSULATING TABLE
0 15 IIF. '
', Leakage current must not exceed 0 5 mA
- Be sure to test for leakage with the AC plug In both polarities.

r

o POLARIZATION
This product is equipped with a polarized alternating current
line plug (a plug having one blade wider than the other). This
plug will fit into the power outlet only one way. This is a safety
feature. (U.C model only)

AX-750
-

I REAR PANELS

0 Canadian model

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