Yamaha emx 640 service

Page 1

POWERED MIXER

I CONTENTS

SPECIFICATIONS ...... I...2
PANEL LAYOUT .4
CIRCUIT BOARD LA .. .5
DIMENSIONS ...................... .5
BLOCK & LEVEL DIAGRAMS .. .6
DISASSEMBLY PROCEDURE . .8
LSI PIN DESCRIPTION ...... ..10
IC BLOCK DIAGRAM . ..11
CIRCUIT BOARDS.. ..12
INSPECTIONS ........... 19
CIRCUIT DIAGRAMS ......................................................................... 24

" PARTS LIST

YAMAHA CORP.

PA 011358 M C 'S e Nice HAMAMATSH .JAPAN

1.5mm m4 Printed in Jay. 11 35.12

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EMX640

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 servicing 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, certifi-
cation. recognition of any applicable technical capabilities, or establish a principal-agent relationship of
any form.

The data provided is belived to be accurate and applicable to the unitlsl 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 you 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 E during disassembly and parts replacement. Recheck of 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 defects or other reproductlve harmt

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC 0R PLASTIC COMPONENTS lN VOUR MOUTH FOR ANY REASON WHAT
SO EVER!

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 WARNING

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

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