Yamaha ms300 powered speaker service manual

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PO W ERED SPEAKER

M3300

SERVICE MANUAL

I CONTENTS

SPECIFICATIONS
DIMENSIONS .............................
BLOCK DIAGRAM

PANEL LAYOUT

CIRCUIT BOARD LAYOUT
WIRING .....................................................................
DISASSEM BLY PROCEDURE ..............................
IC BLOCK DIAGRAM ..
CIRCUIT BOARDS
INSPECTIONS ..
OVERALL CIRCUIT DIAGRAM ........................... 17

This document IS pnnled on chlonne Iree (ECF) paper with soy mk. PARTS LI ST

.YAMAHA

PA 011612 HAMAMATSU, J APAN

1.395K-864 Fr D-H Printed in] apan 2001.12

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M5300

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 under
stood by the users, and have therefore not been restated.

WARNING : Failure to follow appropriate service and safety procedures when servtcing this product may result in per
sonal 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.

IMPORTANT: This presentation or sale of this manual to any individual or firm does not constitute authorization certitir
cation, recognition of any applicable technical capabilities, or establish a principalragent relationship of
any form.

The data provided is belived 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, inevitable
and changes in specification 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 bus in the unit (heavy gauge black wires connect to
this bus.)

IMPORTANT : Turn the unit OFF during disassembly and parts replacement. FIecheck L work before you apply power
to the unit.

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 detects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT
SO EVEFI!

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.

IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Cord

IMPORTANT. The wires in this main lead are coloured in
accordance with the following code:
BLUE: NEUTRAL
BROWN: LIVE

As the colours of the wires in the main lead of this apparatus may not
corres and with the coloured markings identifying the terminals in
your p ug, proceed as follows:

The BLUE wire must be connected to the terminal that is marked with
the letter N (or coloured BLACK).

The BROWN wire must be connected to the terminal that is marked
with the letter L (or coloured FIED).

Be certain that neither core is connected to the earth terminal of the
three pin plug.

IWARNING

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