Yamaha KMA-1080 Service Manual

DIGITAL KARAOKE MIXING AMPLIFIER
KMA-1080/KMA-980
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 specifi cally YAMAHA Products, are already
known and understood by the users, and have therefore not been restated.
WARNING:
IMPORTANT:
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. Modifi cations are, therefore, inevitable
and specifi cations are subject to change without notice or obligation to retrofi t. Should any discrepancy appear to exist, please contact
the distributor's Service Division.
WARNING:
IMPORTANT:
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CONTENTS
TO SERVICE PERSONNEL ......................................... 2
IMPEDANCE SELECTOR ............................................ 3
FRONT PANELS .......................................................... 3
REAR PANELS ............................................................. 4
REMOTE CONTROL PANEL ....................................... 5
SPECIFICATIONS .................................................... 5-6
INTERNAL VIEW .......................................................... 6
DISASSEMBLY PROCEDURES .................................. 7
INDICATION OF PROTECTION INFORMATION ........ 8
SELF-DIAGNOSTIC FUNCTION ............................ 9-13
1 0 1 1 6 4
For T model

IMPORTANT NOTICE

Failure to follow appropriate service and safety procedures when servicing this product may result in personal
injury, destruction of expensive components, and failure of the product to perform as specifi ed. For these reasons,
we advise all YAMAHA product owners that any service required should be performed by an authorized YAMA-
HA Retailer or the appointed service representative.
The presentation or sale of this manual to any individual or fi rm does not constitute authorization, certifi cation or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
Static discharges can destroy expensive components. Discharge any static electricity your body may have accumu-
lated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.
Copyright © 2010 YAMAHA CORPORATION. All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.

SERVICE MANUAL

CONFIRMATION OF IDLING CURRENT OF AMP
UNIT ............................................................................ 14
IC DATA ................................................................ 15-17
BLOCK DIAGRAM ..................................................... 18
PIN CONNECTION DIAGRAMS ................................ 19
PRINTED CIRCUIT BOARDS .............................. 20-30
SCHEMATIC DIAGRAMS ..................................... 31-37
REPLACEMENT PARTS LIST ............................. 39-47
REMOTE CONTROL .................................................. 48
SETUP MODE ...................................................... 49-51
'10.02