Yamaha gf 12 gf 16 gf 24

Page 1

MIXING CONSOLE
EFT E/Ia/EIJE'I S/IE/EFEHAE

SERVICE MANUAL

I CONTENTS

SPECIFICATIONS ................................................ 3/4
PANEL LAYOUT

DIMENSIONS ........................................................... 8

BLOCK & LEVEL DIAGRAM

CIRCUIT BOARD LAYOUT
WIRING ........................................
DISASSEMBLY PROCEDURE ..
IC BLOCK DIAGRAM
CIRCUIT BOARDS
INSPECTIONS ............................................................ 26
PARTS LIST

CIRCUIT DIAGRAM

GF24 19990410716800) EYAMAHA
PA 01 em 19990410420000 HAMAMATSU. JAPAN
GF12 19990410408000 1 QZK-ZESI I'Dd-I Printed InJapan 99 03

Page 2

GF24/12
GF16/12
GF12/12

IMPOR TANT NOTICE

This manual has been provrded for the use of authorized Yamaha Retailers and their servrce personnel. It has been assumed
that basic servrce 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 servrcing this product may result In per
sonal IIIJIJIy, destruction of expensive components and failure of the product to perform as specified. For
these reasons, we advrse all Yamaha product owners that all servrce required should be performed by an
allthori7ed Yamaha Retailer or the appointed service representative.

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

The data provided Is hellved to he accllrate and applicable to the Iinlt(s) indicated on the cover. The research engineering, and
servrce departments of Yamaha are continually strivrng to improve Yamaha products. Modifications are, therefore, Inevrtable
and changes In specification are sithect to change wrthoiit notice or obligation to retrofit Should any discrepancy appear to
exist, please contact the distributors Servrce DIvrsIon.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may
have accumulated hy grounding yourself to the ground bliss In the unit (heavy gauge black wrres connect
to this buss.)

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

LITHIUM BA TTERY 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 servrce personnel.

Always replace with batteries of the same type

When installing on the PC board by soldering, solder using the connection terminals provrded 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

ADVARSEL!

LithiumbatteiIrEksplosionsfare ved fellagtrg handteiing. Udskiftning ma kun ske med batteri af samme fabrikat 0g type. lever det brugte

batteri tilbage til leverandren

VARNING

Explosionsfara vrd felaktigt batteribyte.

Anvand samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren.

Kassera anvant batteri enligt fabrikantens Instruktion.

VAROITUS

Paristo voi raJahtaa,Jos se on vrrIIeellisesti asennettu.

Vaihda paristo ainoastaan laltevalmistaJan suosittelemaan tyyppiiin.

Havrta kaytetty paristo valmistaJan ohJeiden mukaisesti.

The followrng information complies wrth Dutch olficial Gazette1995. 45. ESSENTIALS OF ORDER ON THE COLLECTION OF BATTERIES.
- Please refer to the diassembly procedure for the removal of Backrup Battery.
- Leest u voor het vererderenvan de backup batteriJ deze DESChIIJVII'Ig.

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 narm.

DO NOI PLACE SOLDER, ELECT RICAL/ELEC IRONIC OR PEAS! IC COMPONEN IS IN YOUR MOUTH FORANY REASON WHAI
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 wrth solder or components located Inside the enclosure of this product, wash your hands before handling
food.

I WARNING

Components haying special characteristics are marked & and must be replaced wrth parts havrng specification equal to those
originally Installed.