Yamaha kma 950 kma 1000

Page 1

DIGITAL KARAOKE MIXING AMPLIFIER

KMA-1000/KMA-950

SERV CE MANUAL

For T model

IMPORTANT NOTICE \

This manual has been provided for [he 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 personal
Injury. destruction of expensive components, and failure of the product to perform as specified. For these reasons,
we advise all YAMAHA product owners that any service required should be performed by an authorized YAMAV
HA Retailer or the appointed service representative.

IMPORTANT: The presentation or sale of this manual to any indivrdual or fimi does not constitute authorization, certification or
recognition of any applicable technical capabilities. or establish a principleragem relationship of any form.

The data provided is believed to be accurate and applicable to the unil(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 specifications are subject to change wrthout 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 accumue
lated by grounding yourseli to the ground buss in the unit (heavy gauge black wues connect to this buss).

IMPORTANT; Turn the unit OFF during disassembly and pan replacement. Recheck all work before you apply power to the unit.

I CONTENTS

TO SERVICE PERSONNEL .2
IMPEDANCE SELECTOR .3
FRONT PANELS . .3
REAR PANELS . .4
REMOTE CONTROL PANEL ....................................... 5
SPECIFICATIONS .................................................... 5-6
INTERNAL VIEW .......................................................... 6

.7
.8
9-13

DISASSEMBLY PROCEDURES .......................
INDICATION OF PROTECTION INFORMATION
SELF-DIAGNOSTIC FUNCTION

:tDtI- Ez7::t 7M1t I: 7- flimfiiifiéfim bEUii.
This Service Manual uses recycled paper.

Copyrighl © 2009 YAMAHA CORPORATION. All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed eitner in print or electronically wllhoul permission.

CONFIRMATION OF IDLING CURRENT OF AMP
UNIT ..

IC DATA .

BLOCK DIAGRAM
PIN CONNECTION DIAGRAMS ................................ 18
PRINTED CIRCUIT BOARDS .............................. 19-36
SCHEMATIC DIAGRAMS ..................................... 37-50

REPLACEMENT PARTS LIST
REMOTE CONTROL
SETUP MODE . .65-67

. 51-63

fiYAMAHA

YAMAHA CORPORATION
PO BOX 1, Hamamalsu, Japan

m '09.05

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KMA-1 000/KMA-950

ITO SERVICE PERSONNEL

1. Critical Components Information
Components having special characteristics are marked A
and must be replaced with parts having specifications equal
to those originally installed.

2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verily
that all exposed conductive surfaces are properly insulated
from supply circuits.

0 Meter impedance should be equivalent to 1500 ohms shunt-
ed by 0.15uF.

AC LEAKAGE
WALL EQUIPMENT TESTER OR
OUTLET UNDER TEST EQUIVALENT

:f

INSULATING
TABLE

0 Leakage current must not exceed 0.5mA.

0 Be sure to test for leakage with the AC plug in both
polarities.

CAUTION
A F401: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE

2.5A, 250V FUSE.

F402: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE

4A, 250V FUSE.

WARNING: CHEMICAL CONTENT NOTICE!

This product contains chemicals known to the State of California to cause cancer, 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 ex-

pose 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.

About Lead Free Solder

All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder.
Among some types of lead free solder currently available, it is recommended to use one of the following types for the repair work.

0 Sn + Ag + Cu (tin + silver + copper)
- Sn + Cu (tin + copper)
- Sn + Zn + Bi (tin + Zinc + bismuth)

Caution:

As the melting point temperature of the lead free solder is about 30°C to 40°C (50°F to 70°F) higher than that of the lead solder, be

sure to use a soldering iron suitable to each solder.

WARNING: Lithium batteries
CAUTION

Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.

WARNING: Lithium batteries are dangerous because

they can be exploded by improper handling. Observe the

following precautions when handling or replacing lithium
batteries.

0 Leave lithium battery replacement to qualified service
personnel.

0 Always replace with batteries of the same type.

0 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 sol-
dering as quickly as possible.

- Never reverse the battery polarities when installing.

- Do not short the batteries.

- Do not attempt to recharge these batteries.

0 Do not disassemble the batteries.

0 Never heat batteries or throw them into fire.

ADVAFISEL!

Lithiumbatteri iEksplosionsfare ved fejlagtig handtering.
Udskiftning ma kun ske med batteri at samme fabrikat
og type. Lever det brugte batteri tilbage til leverandoren.

VARNING

Explosionstara vid telaktigt batteribyte. Anvand samma
batterityp eller an ekvivalent typ som rekommenderas av
apparattillverkaren. Kassera anvant batteri enligt fabrikan-
tens instruktion.

VAROITUS

Paristo voi rajahtaa, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan
tyyppiin. Havita kaytetty peristo valmistajan ohjeiden mu-
kaisesti.