Technics SLEH 50 Service Manual

Page 1

ORDER NO, AD970303008

Service Manual

Compact Disc Player

System: sc.EH5o Compact Disc Player S L_ E H 5 O

For Europe and Russia Colour
*SB-EHGD *1 se-EHso (K) Black

Area

(E)/(EP) Europe, Russia,
Asia, Latin America,
Middle East and

Remote Control Africa.
Transmitter

RS-EHSO SA~EH50

. For others V , [flfigflfi

DIEITIL AUDI D

MAS H

nun-m5. mk- mm

ea. Remote Control
=jr- Transmitter

RS-EHGO

gr

SA~EH50

RAEO1502'MECHANISM SERIES

Because of unique interconnecting cables, when a component
requires service, send or bring in the entire system.

Specrficatlons V ,,
Audio Section General
DA converter - 1 bit DAC MASH Dimensions 287(W)189(H)/273(D) mm
. Weight 1.6 kg
Pickup Section
Wavelength 7 780 nm Notes: Specifications are subject to change without notice.

Weight and dimensions are approximate.

System/SC-EHSO :

n For Europe and Russia
Sound processor : SH-EHSO, Tuner/Amplifier: SA-EHSO, Compact disc player: SL-EHSO, Cassette deck: RS-EHGO.
Front speakers : * SB-EHEO
For others
' Sound processor: SH-EHSO, Tuner/Amplifier: SA-EHSO, Compact disc player: SL-EHSO, Cassette deck: RS-EHSO,

Front speakers : *2 SB~EH50, Center speaker: *2 SB-PGeo Surround speaker: *2 SB-PSGO

Notes: *1...Made in PAES
*2...Made in MESA
*8...MASH is a trademark of NTT

fiWARNlNG

This service information is designed for experienced repair technicians only and is not designed for use by the general public. it does not
. contain wamings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.

Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

© 1997 Matsushita Electric industrial Co, Ltd.

T O o '
All rights reserved. Unauthorized copying
nlcs _ and distribution is a violation of law.

Page 2

SL-EH59 WI

l Contents

Handling Precautions ior Traverse Deck .
Precaution of Laser Diode
Location of Controls
Listening to Compact Discs .......
Operation Checks and

Main Component Replacement Procedures
Automatic Adjustment Results Display Function
To Supply Power Source
Schematic Diagram .....

Type Illustration of lCs, Transistors and Diodes
Wiring Connection Diagram
Terminal Function of lCs
Troubleshooting Guide
Block Diagram
Replacement Parts List (Electrical
Resistors and Capacitors
Replacement Parts List (Ca Inet an
Cabinet Parts Location

Printed Circuit Board Diagram

Loading Unit Parts Location

NOTE:
Refer to the service manual for Model No. SA-EH50 (ORDER No. AD970. 053%) for information on Accessories",
"Connections, "Installation" and Packaging

CAUTION:

THIS PRODUCT UTILIZES A LASER.

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

l Handling Precautions for Traverse Deck

The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by static electricity of clothes or human body.
So, be careful of electrostatic breakdown during repair of the traversedeck (optical pickup).

0 Handling of traverse deck (optical pickup)

1. Do not subject the traverse deck (optical pickup) to static electricity as it' Is
extremely sensitive to electrical shock.

2. To protect the laser diode against electrostatic breakdown, short the flexible
board (F PC board) with a clip or similar object.

3. Take care not to apply excessive stress to the flexible board (FFC board).

4. Do not turn the variable resistor (laser power adjustment). It has already been
adjusted.

0 Grounding for electrostatic breakdown prevention
1. Human body grounding
Use the anti- static wrist strap to discharge the static electricity from your body.
2. Work table grounding
Put a conducive material (sheet) or steel sheet onthe area where the traverse
deck (optical pickup) is p l,aced and ground the sheet.

Caution:

The static electricity of your clothes will not be grounded through the wrist strap.
So, take care not to let your clothes touch the traverse deck (optical pickup).

PFC board Lens (Do not touch)

(Handle it carefully)

Variable IESISIOI

/ .
No.®(GND) pin No.®(Lo) pin (Dononum)

Caution when Replacing the Traverse Deck:

The traverse deck has a short point shorted with solder to protect the laser
diode against electrostatic breakdown. Be sure to remove the solder from the
short point before making connections.

Wrist strap

(Anti-static bracelet) /
iron plate or some metals to
conduct electricity

I Precaution of Laser Diode

_CAUTION: This product utilizes a laser diode with the unit turned on", invisible laser radiation is emitted from the pick up lens.
Wave length: 780 nm
Maximum output radiation power from pick up: 100 pWNDE
Laser radiation from the pick up unit is safety level, but be sure the followings:
1. Do not disassemble the pick up unit. since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.
3. Do not lock at the focus lens using optical instruments.
4. Recommend not to look at pick up lens for along time.
AGHTUNG: Diesee produkt enthalt elne iaserdlode. lm eingeschalteten zustand wird unsichtbare laserstrahlung von der laserelnheit

adgeetrahit.
Wellenlange: 780 nm
Maximale strahlungsieistung der iaserlnhelt: 100 pWNDE

Die strahlung an der lasereinheit ist ungefahrlloh, wenn iolgende punkte beachtet werden:

1. Die lasereinheit nicht zeriegen, da die strahlung an derireigelegten laserdiode gefahriich ist.
2. Den werksseitig justierten einstellregler der iasereinreit nicht versiellen.

3. Nicht mit optischon instmmenten in die lokussierlinse blicken.

42 Ni'cht Irberiangere zeit in die lokussierlinse blicken.

_2_