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POWERED MULTIMEDIA SPEAKERS
YST-MS50(M)
SERVICE MANUAL
The contents of this Service Manual are applicable to the products with serial numbers of Z200001 and up.
POWERED MULTIMEDIA SPEAKERS YST-MS50
BASS
0 10
POWERED MULTIMEDIA SPEAKERS
VOLUME
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 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 principle-agent 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 departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevita-
ble 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.
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).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the
unit.
s CONTENTS
TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 1
FRONT AND REAR PANELS . . . . . . . . . . . . . . . 1 – 2
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . 5
PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 6 – 8
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . 10
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 – 15
PARTS LIST FOR CARBON RESISTORS . . . . . . . . 16
100778

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YST-MS50(M)
s TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked Z
and must be replaced with parts having specifications equal
to those originally installed.
WALL
OUTLET
EQUIPMENT
UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
2. 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.
q Meter impedance should be equivalent to 1500 ohm shunted
by 0.15µF.
INSULATING
TABLE
q Leakage current must not exceed 0.5mA.
q Be sure to test for leakage with the AC plug in both
polarities.
AV
CAUTION
F1 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.0A, 250V FUSE.
CAUTION
F1 : REPLACE WITH SAME TYPE 2.0A, 250V FUSE.
ATTENTION
F1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 2.0A, 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 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.
s FRONT AND REAR PANELS
w Satellite Speakers Front Panel
Lch Rch
w Satellite Speakers Rear Panel
Lch Rch
1

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w Subwoofer Front Panel
YST-MS50(M)
w Subwoofer Rear Panel
U and C models
B and G models
A model
2