Yamaha gx 70

Page 1

MINI COMPONENT SYSTEM

X-7O

/ 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 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 YAMAHA Retailer or the appointed service representative

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization. oertifica~
lion or recognition of any applicable technical capabilities, or establish a principle-agent relationship
) of any form.

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. Modifications are, therefore,
inevitable and specifications are subject to change without notice or obligation to retrofit, Should any discrepancy appear to

\

I CONTENTS

TO SERVICE PERSONNEL ..
FRONT PANELS
REAR PANELS ..
SPECIFICATIONS .
INTERNAL VIEW
DISASSEMBLY PROCEDURES
VOLUME RANGE .....................
SYSTEM CONNECTOR CHECK ..
TEST PROGRAM MODE

CD TEST MODE .......... 15
CD STANDARD OPERATION CHART.. .16~19
CD ERROR MESSAGES ....................

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 pan replacement, Recheck all work before you apply power to the
unit.

/

A DJ USTMENTS

IC DATA ..

PRINTED CIRCUIT BOARD . .. 32~46
PIN CONNECTION DIAGRAM . ..... 47
BLOCK DIAGRAM ..48~51
SCHEMATIC DIAGRAM . 52~60
PARTS LIST ................ 61~91

REMOTE CONTROL TRANSMITTER
APPLY GREASE PICTURE
NX-GX70..
NX-C'IO .
NX-E70..

gpMAHA

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3K-198 IE g Printed in Japan 96.12

OL'XD

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GX-70

GX-TO

ITO SERVICE PERSONNEL
AC LEAKAGE

1. Critical Components Information. WALL EQUIPMENT TESTER OR
Components having special characteristics are marked and OUTLET UNDER TEST EQUIVALENT
must be replaced with parts having specifications equal to

those originally installed. ® D-

2. Leakage Current Measurement (For 120V Models Only). I
When service has been completed. it is imperative to verify =
that all exposed conductive suriaces are properly insulated INSULATING . .
from supply circuits. TABLE

0 Meter impedance should be equivalent to 1500 ohm shunted c Leakage current must not exceed 0.5mA.

b 0.15 F.
y it 0 Be sure to test for leakage with the AC plug in both

polarities.

CAUTION

F501 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.0A, 125V FUSE.

_A_V "F502 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 4.0A, 125V FUSE."
F504, 505 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE. REPLACE ONLY WITH SAME TYPE 3.15A. 125V FUSE."

CAUTION

F501 : REPLACE WITH SAME TYPE 2.0A, 125V FUSE.

F502 : REPLACE WITH SAME TYPE 4.0A, 125V FUSE.
F504, 505: REPLACE WITH SAME TYPE 3.15A, 125V FUSE.

ATTENTION

F501 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 2.0A, 125V.

F502 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 4.0A, 125V.
F504, 505 2 UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 3.15A, 125V.

CAUTION : USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

THE COMPACT DISC PLAYER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLY
QUALIFIED SERVICE PERSONNEL.

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
This set employs a laser. Therefore, be sure to carefully follow the instructions below when servicing .

1. Laser Diode Properties

0 Material :GaAlAs

o Wavelength : 780 nm

0 Emission Duration :Continuous

0 Laser Output : max. 44.6 pW'

* This output is the value measured at a distance oi about 200 mm from the objective lens surface on the
Optical Pick-up Block.

2. When checking the laser diode emission, keep your eyes more than 30 cm away trom the objective lens.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production oI 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 detects
or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH
FOR ANY REASON WHATSOEVER! '

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 with solder or components located inside the enclosure of this product, wash
your hands before handling food.