Yamaha dsp a3090

Page 1

DIGITAL SOUND FIELD PROCESSING
AMPLIFIER

DSP-A3090

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 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 or recognition of any applicable technical capabilities, or establishaprinciple-agent
relationship of any form.

The data provided is believed to be accurate and applicable to the unit 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 distributor's Service Division, i

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

IMPORTANT: Turn the unit OFF during disassembly and parts replacemenl. Recheck all work before you apply power

\\ to the unit.

I CONTENTS

TO SERVICE PERSONNEL ..... 1 IC DATA ................... 23~36
REAR PANELS IC BLOCKS 37~42
SPECIFICATIONS DISPLAY DATA . 43~44
INTERNAL VIEW PIN CONNECTION DIAGRAM ......45
SET MENU TABLE ................... 4 PRINTED CIRCUIT BOARD 46~67
DISASSEMBLY PROCEDURES REMOTE CONTROL TRANSMITTER. 68~69
ADJUSTMENTS ................. . 6 BLOCK DIAGRAM .......... ...70
SELF DIAGNOSIS FUNCTION ..... ...... 7~21 SCHEMATIC DIAGRAM 71~77
TEST POINT WAVEFORMS 22 PARTS LIST ..... . ..... .. ........ .............. . ..... 78~101

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DSP-A3090

DS P-A3090

I TO SERVICE PERSONNEL

1.

Critical Components Information.

Components having special characteristics are marked and
must be replaced with pans having specifications equal to
those originally installed.

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

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

Leakage current must not exceed 0.5mA.

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

' AC LEAKAGE
WALL EQUIPMENT - TESTER OR
OUTLET UNDER TEST EQUIVALENT
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 REASON WHATSOEVER!

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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