Yamaha emx 860 st

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POWERED MIXER

SERVICE MANUAL

I C ONTE NTS

SPECIFICATIONS ................................................ 3/4
PANEL LAYOUT .
CIRCUIT BOARD LAYOUT
BLOCK DIAGRAM

DISASSEM BLY PROCEDURE
LSI PIN DESCRIPTION

|C BLOCK DIAGRAM

CIRCUIT BOARDS ...................................... 12
INSPECTION .............................................................. 15
MIDI INPLEMENTATION CHART .......................................... 25
PARTS LIST

PA [YAMAHA

19990220-99800 1.96K~296 [1141 Printed in Japan 99.03

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EMX8GOST

IMPOR TANT NOTICE

This manual has been provided for the use ol 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 tailure 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 CerIIIl'
cation, recognition of any applicable technical capabilities, or establish a principalragent relationship of
any lorm.

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 buss in the unit (heavy gauge black wires connect
to this buss.)

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

LITHIUM BA 'I'I'ERY HANDLING

This product uses a lithium battery for memory backrup.
WARNING : Lithium batteries are dangerous because they can be exploded by improper handling. Observe the following prer
cautions when handling or replacing lithium batteries.

Leave lithium battery replacement to qualified service personnel.

Always replace with batteries of the same type.

When installing on the PC board by soldering, solder using the connection terminals provided on the battery cells.

Never solder directly to the cells. Perform the soldering as quickly as possible.

Never reverse the battery polarities when installing.

Do not short the batteries.

Do not attempt to recharge these batteries.

Do not disasemble the batteries.

Never heat batteries or throw them into fire.

ADVARS E L!

LithiumbatterirEksptoSionsfare ved fejlagtig handtering. Udskiftning ma kun ske med batleri al samme fabrikat og type. lever det brugte

batteri tilbage til leverandren.

VARNING

Explosionslara vld felaktigt batteribyte.

Anvand samma barlerityp eller en ekvivalent typ som rekommenderas av apparattitlverkaren.

Kassera anvant batten enligt tabrikantens instruktion.

VAROITUS

Paristo voi rajahtaa, jos se on virheellisesti asennetlu.

Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiiin.

Havita kaytetty paristo valmistajan ohieiden mukaisesti.

The following information complies with Dutch official Gazette 1995. 45; ESSENTIALS OF ORDER ON THE COLLECTION OF BATTERIES.
- Please refer to the diassembly procedure tor the removal of Backrup Battery.
- Leest u voor het verwijderen van de backup batteriy deze beschrijving.

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 delects 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 skinl 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.

IWARNING

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