Technics SLEH 550 Service Manual

Page 1

ORDER NO. ADSSOSOGSCB

ervice Manual

Compact Disc Player

m... cm: SL-EH550
[tinge

DIGITAL AUDIO (S) ........ Silver Type
Area
MASH *1 *zsa-Eiisso SB-EH550 (E) ........ Europe.

"tutti-stage noise shaving Remote Control
Transmitter
SL-EH550 SH-EH550

System SC-EH550
Sound Processor SH-EH550
Fls-EH750 SA-EHSSO Tuner/Amplifier SA-EH550
CD Player SL-EH550
Cassette Deck HS~EH750
Because of unique interconnecting cables, when a component Front Speakers SB-EH550
requires service, send or bring in the entire system.
Traverse Deck : RAE01522-1 MECHANISM SERIES
Specifications
Audio Section General
No. of channels: 2 (left and right, stereo) Dimensions (WxHxD): 293x89x268 mm
Frequency response: 20 to 20,000 Hz (+0.5 dB to -2 dB) Weight: 16 kg
Output voltage: 0.78 V (at 0 dB)
Dynamic range: 85 dB Notes: Specifications are subject to change without notice.
SIN: 95 dB Weight and dimensions are approximate.
Total harmonic distortion: 0.02 % (1 kHz, 0 dB) Total harmonic distortion is measured by the digital
Wow and flutter: Below measurable limit spectrum analyzer.
Digital filter: 3 is *1;
DA converter: 1 bit DAC MASH *2: Made in Singapore.
Output impedance: 1 kit
Load impedance: More than 10 kt!

Pickup Section
Wavelength: 780 nm

AWARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not
contain warnings or cautions to advise non-technical individuals oi 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.

©1999 Matsushita Electric Industrial Co.,Ltd.

. ® All rights reserved, Unauthorized copying
ec nlcs and distribution is a violation of law.

Page 2

iSL-EH550 I
l Contents

Handling Precautions for Traverse Deck
Precaution of Laser Diode. 2,3 Wiring Connection Diagram .
Location of Controls 3 Block Diagram ..................
Operation Checks and Troubleshooting Guide .

Component Replacement Procedures ............... .. Terminal Function of IC's .
Error Code Display and Servo Adjustment Function . 9,10 Replacement Parts List
Type Illustration of lC's, Transistors and Diodes c. Cabinet Parts Location
Schematic Diagram .......................................... Loading Unit Parts Location .

Printed Circuit Board Diagram

NOTE:
Refer to the service manual for Model No. SA-EH550 (ORDER No. AD990306262) for information on "Accessories",
"Connections", "Installation" , "Operations" 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.

I 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 oi electrostatic breakdown during repair of the traverse deck (optical pickup).

0 Handling of traverse deck (optical pickup) FFC board Lens (Do not touch)

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

2. To protect the laser diode against electrostatic breakdown, short the flexible
board (FFC 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 conductive material (sheet) or steel sheet on the area where the traverse
deck (optical pickup) is placed, and ground the sheet,

Variable resistor
(Do not turn)

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).

Wrist strap
(Anti-static bracelet) /

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 uW/VDE

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 look at the focus lens using optical instruments.

4. Recommend not to look at pick up lens tor a long time.