Yamaha mx1 mx2

Page 1

STEREO POWER AMPLIFIER

X-1IMX-2

/_\

SERVICE MANUAL

/"\

/ IMPORTANT NOTICE \

(r 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 andrundetstood 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.

E
>.
2
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N

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 principle-agent relationship of any {on-n.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover, The reseach,

,/ 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
L retmlitr 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) V
IMPORTANT: Turn the unit OFF during disassembly and pan replacement Recheck all work before you
\ apply power to the unit.
- I CONTENTS
TO SERVICE PERSONNEmeu..." ...... ............. ......1 ADJUSTMENTS...... ........
FRONT PANELS .1 PRINTED CIRCUIT BOARD
MX-1 REAR PANELS .2 BLOCK DIAGRAM ..
MX-2 REAR PANELS . 3 MX-1 SCHEMATIC DIAGRAM ........ 22
SPECIFICATIONS 4 MX-2 SCHEMATIC DIAGRAM .
I, INTERNAL VIEW ...5 PARTS LIST ...... .......
{K DISASSEMBLY PROCEDURES .

YAMAHA CORPORATION
P.O.Box1rHamamatsttalanan
3r05K-833 fll Q Printed in JaDan 9344

Page 2

I

I

"IA-'IIMK-l

MX-2

I TO SERVICE PERSONNEL

1.

Critical Components Information.

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

. Leakage Current Measurement (For 120V Models Only).

When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.

Meter impedance should be equivalent to 1500 ohm shunted
by 0.1 SuF.

Leakage current must not exceed 0.5mA.

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

WALL
OUTLET

®

:D-

AC LEAKAGE
EQUIPMENT TESTER OR
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 SOLDEFI, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH
FOR ANY REASON WHATSOEVERI

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 FRONT PANELS

O MX-1

I:

I-I-JI L21
O MX-2

mm mm Mme-am m1

II: