Yamaha mx d1

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DIGITAL POWER AMPLIFIER

MX-D1

SERVICE MANUAL

IMPORTANT NOTICE

This manual has been provided for [he 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 principleeagem 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 depanments ot YAMAHA are continually striving to improve YAMAHA products. Modifications are. therefore. inevitable
and specifications are subject to change WIIhUuI notice or obligation to retrofit. Should any discrepancy appear to exist, please
Contact the distributor's Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have

accumulated by grounding yourselt to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.

I CONTENTS

T0 SERVICE PERSONNEL 2~3
FRONT PANEL . 4
REAR PANELS . 4~5
SPECIFICATIONS 6
INTERNAL VIEW 7
SERVICE PRECAUTIONS / U-EXEO?$§$TE.....8~1O
DISASSEMBLY PROCEDURES/fififllfi 11~14
TROUBLE SHOOTING l MET]: 9973;} ..

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This Service Manual uses recycled paper.

PROTECTION INFORMATION /

7D7T'79 a Jfifi .. 17~18
IC DATA 19~21
BLOCK DIAGRAM 22~23

PRINTED CIRCUIT BOARD 24~33
PIN CONNECTION DIAGRAM 34
SCHEMATIC DIAGRAM 35~37
PARTS LIST 39~54

YAMAHA

YAMAHA CORPORATION

P.O.Box 1, Hamamaisu. Japan

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MX-D1

I TO SERVICE PERSONNEL

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

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

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

AC LEAKAGE
WALL EQUIPMENT TESTER OR
OUTLET UNDER TEST EQUIVALENT

@ID-

J:

INSULATING
TABLE

0 Leakage current must not exceed 0.5mA.

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

CAUTION
F501: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 20A,

250V FUSE.
CAUTION

F501: REPLACE WITH SAME TYPE 20A, 250V FUSE.

ATTENTION

F501: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 20A, 250V.

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!

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.