Yamaha dsp a1

Page 1

DSP/AV AMPLIFIER

,¥ DSP-A1

SERVICE MANUAL

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/ IMPORTANT NOTICE

This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
lt has been assumed that basic service pmcedures 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 aprincipleagent
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 distributors 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 buss). ,

IMPORTANT: Tum the unit OFF during disassembly and part replacement. Recheck all work before you apply power

\ [0 the unit.

I CONTENTS

TO SERVICE PERSONNEL . ....1 IC DATA .23~37
REAR PANELS 1~2 BLOCK DIAGRAM . ....38~41
SPECIFICATIONS 3~5 PRINTED CIRCUIT BOARD ..... . ............ .......42~64
INTERNAL VIEW 6 PIN CONNECTION DIAGRAM .

DISASSEMBLY PROCEDURES ...6~7 SCHEMATIC DIAGRAM
ADJUSTMENTS . . 8 PARTS LIST ..
SELF DIAGNOSIS FUNCTION .9~21 REMOTE CONTROL TRANSMITTER.
DISPLAY DATA .................. 21~22
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YAMAHA \

YAMAHA. CORPORATION
P.0.Box1 ,Hamamatsu,Japan

3K-626 [El 63 Printed in Japan 982

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DSP-A1

I TO SERVICE PERSONNEL

1. Critical Components lniormation.

Components having special characteristics are marked and AC LEAKAGE
must be replaced with parts having specifications equal to WALL EQUIPMENT TESTEFi_OFi
those originally installed. OUTLET UNDER TEST EQUIVALENT
2. Leakage Current Measurement (For 120V Models Only). : >____ , L
When service has been completed, it is imperative to verity ®
that all exposed conductive surtaces are properly insulated f
f | ' 't . :7
rom supp y CerUl s . INSULATING
0 Meter impedance should be equivalent to 1500 ohm shunted TABLE

by 0.15m
o Leakage current must not exceed 0.5mA.

0 Be sure to test lor 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 oi 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 OFl PLASTIC COMPONENTS IN YOUR MOUTH FOR
ANY REASON WHATSOEVER!

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

V R, T models

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