Yamaha emx 68s emx 88s sm

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POWERED MIXER / WWWERED MIXER

EMX688 EMX888

' OPTION
RK-88 RACK MOUNT KIT

I CONTENTS

SPECIFICATIONS ..............
PANEL LAYOUT ..................
CIRCUIT BOARD LAYOUT & WIRING

DIMENSIONS ............................................ 11
BLOCK & LEVEL DIAGRAM ............................................................. 12
DISASSEMBLY PROCEDURE. 14
LSI PIN DESCRIPTION ...... 20
IC BLOCK DIAGRAM... 22
CIRCUIT BOARDS ........................................................................... 23
INSPECTION .................................................................................... 37
OVERALL CIRCUIT DIAGRAM
m... PARTS LIST
FA 011625 YAMAHA
EMX68S 20020325792000 HAMAMATSU JAPAN
EMXSSS 20020325710500!) 1,387K-7041FI' (D Printed in Japan 2002.03

RKSS 2002032572500

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EMXBBS / EMXBBS

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 per-
sonal injury, destruction of expensive components and failure of the product to per form 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, certifica-
tion, recognition of any applicable technical capabilities, or establish a principal-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, therefor, 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 buss in the unit (heavy gauge black wires connect to this
buss).

IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all 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 reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ ELECTRONIC OR PLASTIC COMPONENTS IN YOUR 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 ot this product, wash your hands before handling food.

IMPORTANT NOTICE FOR THE UNITED KINGDOM I WARNING
Connecting the Plug and Cord Components having special characteristics are marked A and
WARNING: THIS APPARATUS MUST BE EARTHED must be replaced With parts having specification equal to those
IMPORTANT: The wires in this main lead are coloured in accor- originally installed.

dance with the following code:

GREEN-AND-YELLOW: EARTH

BLUE: NEUTRAL

BROWN: LIVE
As the colours of the wires in the main lead of this apparatus may not
correspond With the coloured markings identifying the terminals in your
plug, proceed as tollows:
The GREENrandrYELLOW wire must be connected to the terminal in the
plug that is marked With the letter E or the safety earth symbol (or coloured
GREEN or GREENrandrYELLOW).
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 RED).

This applies only to products distributed by Yamaha Kemble Music (U. K.) Ltd.