Yamaha mg12 4fx service manual

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MD(ING CONSOLE

MG12/4 FX

SERVICE MANUAL

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ICONTENTSD [l D n

SPECIFICATIONS [l I] [I [I a ................................................ 3/5
DIMENSIONSEI I] I] [I a ..........................
PANEL LAYOUT] I] I] I] n I] n I]
CIRCUIT BOARD LAYOUT[] I] a
WIRING] a n a I] .................................................................. 1
DISASSEMBLY PROCEDURE
LSI PIN DESCRIPTIOIfll LS|[] a
IC BLOCK DIAGRAM] ICU a [I

INSPECTIONSEI I] I] [I ....................................................... 30/35
PARTS LIST

BLOCK DIAGRAM & LEVEL DIAGRAM

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OVERALL CIRCUIT DIAGRAM/manna

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PA .YAMAHA

HAMAMATSU, J APAN
200501-38850 Copyright (C) Yamaha Corporation All rights reserved. PDF-K m Dgfl '05I02

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MG12/4FX

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 servrce and safety procedures when servicing this product may result in per
sonal iniury, destruction of expensive components and failure of the product to pertorm 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 certifir
cation, recognition of any applicable technical capabilities, or establish a principalragenl 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 oi Yamaha are continually strivmg to improve Yamaha products. Modifications are, therefore, inevitable
and changes in specilication 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. Recheck ail 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!

It 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

WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT. The wires in this mains lead are coloured in accordance with the following code:
GREENVANDVYELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured makings identifying the terminals in your
plug proceed as follows:
The wire which is coloured GREENrandrYELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety
earth symbol ® or coloured GREEN or GREENrandrYELLOW.
The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED.

IWARNING

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

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