Yamaha dsp a970 1

Page 1

DIGITAL SOUND FIELD
PROCESSING AMPLIFIER

DSP-A97O

SERVICE MANUAL

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I CONTENTS

TO SERVICE PERSONNEL
REAR PANELS . ...........
SPECIFICATIONS .....
BLOCK DIAGRAM
INTERNAL VIEW .............
DISASSEMBLY PROCEDURES
ADJUSTMENTS....... .....
DIAGNOSTICS MODE .

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This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
it has been assumed that basic service procedures tnherant to the industry. and more specifically YAMAHA
Products. are already known and understood by the users. and have titeretore not been restated.

WARNING: Failure to ionow appropriate service and safety procedures when servicing this product
may result in personal injury. destruction of expensive components and failure at the
product to perform as specified. For these reasons, we advise all YAMAHA product owners
that all service required should be pertonned by an authorized YAMAHA Retailer n the
appointed service repretentative.

IMPORTANT: The pmsetiialion or sale of this manual to any individual or fimt does not constitute
authorization. certification or recognition or any applicable technical capabilitict. or
establish a principle-agent telaiiomllip of any form.

The data provided is believed to be accurate and applicable to the wilds) indicated on the covert The march,

engineering, and service departments of YAMAHA ate Evnliliually striving to improve YAMAHA pmductst

Modifications are. therefore, inevitable and specifications are subject to change without notice or obligatim lo

retrofit. Should any discrepancy appear to exist. please contact the distributor's Service Division.

WARNING: static discharges can deslmy expensive components. Discharge any static ctectricityyottr
body may have accumulated by grounding youraetr to the ground buss in the unit (hasty
gauge black wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and parts replacement, Rechcck all work laden you

apply power to the unit. 1/

IMPORTANT NOTICE

PROTECTION FUNCTION .. ............. .10
IC DATA .. .......
LCD UNIT DATA ..
TEST POINT WAVEFORMS ..
PRINTED CIRCUIT BOARD ..
SCHEMATIC DIAGRAM ......
REMOTE CONTROL TRANSMITTER
PARTS LIST ..

YAMAHA CORPORATION
P,O.Boxi,Hamamatswapan
Aux-293 fl 3) Print? in Japan; 931

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DSP-A970

I TO SERVICE PERSONNEL

1. Critical Components Information. AC LEAKAGE
Components having special characteristics are marked and WALL EQUIPMENT TESTER on
must be replaced with pans having specifications equal to OUTLET UNDER TEST EQUIVALENT
those originally installed.

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

TABLE

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.

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 inhaIe
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

V USA & Canadian models