Yamaha ax 350

Page 1

STEREO INTEGRATED AMPLIFIER

SERVICE MANUAL

I FRONT PANEL

YAMAHA NATURAL SOUND STEREO AMPLIFIER AX-350

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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 inherant 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 personal injury. destrucuon of expensive components
and failure of the product to perform as specified. For these reasons. we advise all Yamaha product owners that all 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, recognition of any applicable technical
capabilities, or establish a principle~a5ent 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 8:. therefore. inevitable and specifications are subiect to change without notice or obligation to retrofit- Should any
discrepancy appear to exist. please contact the distributor's Service Division.

WARNING; Static discharges can destroy expensive components. Discharge any static electricity your body may" have accumulated by gounding yourself to the ground
buss in the unit (heavy gauge black wires connect to dais buss).

lMPORTANT: Turn the unit OFF during disassemblv and parts replacement. Recheck all work before you apply power to the unit

I CONTENTS

TO SERVICE PERSONNEL .............................. 1 BLOCK DIAGRAM .. ........................................ 4
REAR PANELS ............................................... 1 WIRING ......................................................... 5
SPECIFICATIONS .......................................... 2 IC BLOCK ................................................... ..5
INTERNAL VIEW ............................................. 3 PRINTED CIRCUIT BOARD ....................... 541
D|$ASSEMBLY PROCEDURES ..... . .......... ...3 SCHEMATIC DIAGRAM ............................ 12,13
ADJUSTMENTS .............................................. 4 PARTS LIST .......................................... 14.49
1 00360 XMAAHAMCOQOflTg

PO.Boxl,Hamarnatsu,Japan
0.24k-502 @ Printed in Japan '90.10

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I TO SERVICE PERSONNEL

i

1. Critical Components Information.
Components having special characteristics are marked
and must be replaced with parts having specifications equal
to those originally installed.

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2. Leakage Current MeasurementtFor 120V Model Only). 53%;? :2;- 82 EEBTOEEELglSTE

When service has been completed, it is imperative that you
verify that all exposed conductive surfaces are properly
insulated from supply circuits.

0 Meter impedance should be equivalent to 1600 ohm shunted
by 0.15uF.

e Leakage current must not exceed 0.5mA.

I 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 WHAT SO EVER!

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.

I REAR PANELS

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