Yamaha dsp a270

Page 1

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I CONTENTS
TO SERVICE PERSONNEL 1 PROTECTION FUNCTION 14
REAR PANELS 1~2 IC DATA............... 15~22

SPECIFICATIONS
BLOCK DIAGRAM ..
INTERNAL VIEW ..
DISASSEMBLY PROCEDURES
ADJUSTMENTS.............
DIAGNOSTICS MODE ..

WARNING:

IMPORTANT:

WARNING:

IMPORTANT:

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 inhemnt to the industry. and more specifically YAMAHA
Products, are already known and understood by the users, and have therefore not been restated.

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.

The presentation or sale of this manual to any individual or iirrn does not constitute
authorization, certification or recognition of any applicable technical capabilities, or
establish a principle-agent relationship of any form

The dam provided is believed to be accurate and applicable to the unit(s) indicated on the cover, The resemh.
engineering. and service departments of YAMAHA are continually striving to improve YAMAHA products
Modifications are.
retrofit Should any discrepancy appear to exist, please contact the distributor's Service Division

therefore, inevitable and specifications are subject to change without notice or obligation to

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).

Turn the unit OFF during disassembly and parts replacement. Recheclt all work before you

...3 LCD UNIT DATA .

PRINTED CIRCUIT BOARD .
SCHEMATIC DIAGRAM
PARTS LIST
REMOTE CONTROL TRANSMITTER ...................74~75

Y MAHA

YAMAHA CORPORATION
P.O.Box1,Hamamatsu,Japan

3.15K-044 [a 6) Printed in Japan 932

OLOZV'dSO

Page 2

DSP-A2070

I TO SERVICE PERSONNEL

1. Critical Components Information. AC LEAKAGE I
Components having special characteristics are marked and WALL EQU|PMENT TESTER OR
must be replaced with pans having specifications equal to OUTLET UNDEFI TEST EQUIVALENT

those originally installed..

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

from supply circuits. INSULATING
' TABLE

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

I Leakage current must not exceed 0.5mA.

DSP-A2070

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

WARNING: CHEMICAL CONTENT NOTICE! I

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 vaporl

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 at Canadian models