Yamaha ax 540

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STEREO INTEGRATED AMPLIFIER

AX-54O

SERVICE MANUAL

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/ IMPORTANT NOTICE \

/ This manual has been provided for the use of authcrized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures itinerant to the industry, and more specifically YAMAHA
Products, are already known and understood by the users, and have therefore not been restatedi

WARNING: Failure to follow appropriate service and safety pmcedures when servicing this product
may result in peraenal injury. destruction of expensive cumpancnte and failure of the
product to Perform as specified. For these reasons. we advise all YAMAHA product owners
that all service required should be pefiormed 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
autherizatien, certification or recogniticn 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 resetch,
engineering, and service departmenu of YAMAHA are continually striving to improve YAMAHA products.
Modifications are, therefore, inevitable and specificatiané are subject to change without notice or obligation to
retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Divisiun

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

IMPORTANT: Tum the unit OFF during disassernbly and pans replacement. Reeheclr all woflc before you
apply power to the unit. /

l I CONTENTS

TO SERVICE PERSONNEL. ........................ . ................. 1 ADJUSTMENTS ............................................................. 4
REAR PANELS INTERCONNECT WIRING DIAGRAM
SPECIFICATIONS PRINTED CIRCUIT BOARD .
BLOCK DIAGRAM . SCHEMATIC DIAGRAM ..
INTERNAL VIEW ............................................................ 3 PARTS LIST ....................................... ....................15~23
DISASSEMBLY PROCEDURES .................................... 4

- . YAMAHA

YAMAHA CORPORATION
POBox1, Hamamatsu, Japan

2.0K-732 II-ZIJG) Printed in Japan '903

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AX-540

I TO SERVICE PERSONNEL

1. Critical Components Information, , Ac LEAKAGE
Components having special characteristics are marked and WALL EQUIPMENT TESTER OR I
must be replaced with parts having specifications equal to OUTLET UNDER TEST EQUIVALENT
those originally installed.~

2. Leakage Current Measurement (For 120V Model Only). ® :13-
When service has been completed, it is imperative that you J.-
verify that all exposed conductive surfaces are properly insu-
lated from supply circuits. INSULATING _

0 Meter impedance should be equivalent to 1500 ohm shunted TABLE
by 0,15uF

o Leakage current must not exceed 0.5mAt

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

I REAR PANELS

V Australian & British models ' I

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