Yamaha ax 392

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AX- 392

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 this 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.
certification or recognition 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 research.

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 the disttibutor's Service Division,

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

IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheclt all work before you apply

\ power to the units /
TO SERVICE PERSONNEL 1 ADJUSTMENTS ...... . ........ 6
REMOTE CONTROL PANEL 1 u-COM DATA 6
REAR PANELS 2 PRINTED CIRCUIT BOARD ........ ..... 7~11
SPECIFICATIONS ....... 3 SCHEMATIC DIAGRAM .. .......... ........ 12~13
INTERNAL VIEW 4 PARTS LIST . 14-24
DISASSEMBLY PROCEDURES . 4 REMOTE CONTROL TRANSMITTER ..

} BLOCK DIAGRAM 5

100634

YAMAHA

YAMAHA CORPORATION

Pi0.Box I, Hamamatsu, Japan

1.45K<104 5 Printed in Japan 98.3

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AX-392

I TO SERVICE PERSONNEL

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

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

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

o Leakage current must not exceed 0.5mA.
0 Be sure to test for leakage with the AC plug in both polarities.

WALL
OUTLET

EQUIPMENT
UNDER TEST

AC LEAKAGE
TESTER OR
EQUIVALENT

®

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INSULATING
TABLE

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 REA-

SON WHATSOEVER!

Er

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose

eyes to solder/flux vapor!

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

handling food.

I REMOTE CONTROL PANEL

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REMOTE coNrRol. THANSMIWEH