Technics SLHD 55 Service Manual

Page 1

ORDER NO. ADQBOSOSOCZ

Service Manual

CD Player Compact Disc Player

@033 MASH SL-H D55

DIGITAL AUDIO a MASH is a trademark of MT.

Colour
(S) ............... Silver Type
'SB-HDSSA 'SB-HD55A
Area
$41055 ST-HDS5 E .................. Europe.
System: SC-HD55
$44975 SE-HD55 Remote control
transmitter
Because of unique interconnecting cables, when a component
requires service, send or bring in the entire system.
RAE0152Z Mechanism Series
Specifications Genera'
Dimensions : 202(Wide)/ 76(High)/ 254(Depth) mm
Audio Weight: 1.4 kg

DA converter: 1 bit 2 DAC MASHfit
Notes:

1. Weight and dimensions shown are approximate.

Pcku
I P 2. Design and specifications are subject to change without notice.

Wavelength: 780 nm

System/SC-HDES:
Tuner: ST-HD55, Compact Disc Player: SL-HD55. Amplifier: SE-HD55, Cassette Deck: RS-HD75, Speakers: SB

Notes: *......Made in PAES

A WARNING
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 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.

©1998 Matsushita Electric industrial Co., Ltd.

0 ® '
I Gehnlcs All rights reserved. Unauthorized copying and
distribution is a violation ot law.

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SL-HD55

I Contents

Precaution of Laser Diode
Location of Controls .........
Handling Precautions for Traverse Deck
Operation Checks and Main Component

Replacement Procedures . ...............................
Error Code Display and Servo Adjustment Function
Measurements and Adiustments

Schematic Diagram .
Printed Circuit Board lag a
Wiring Connection Diagra
Terminal Function of HTS
Replacement Parts List (Cabinet) ..
Resistors and Capacitors .......
Replacement Parts List (Electrical) ..

Block Diagram 2~14 Cabinet Parts Location ..
Blue LED ..15 Loading Mechanism Parts
NOTES:

IRefer to the service manual for Model No. ST-HD55 (ORDER No. AD9303051CZ) for information on Installation and Connections.
ORefer to the service manual for Model No. SE-HDSS (ORDER No. A0980304902) for information on Accessories.

IPrecaution of Laser Diode

CAUTION: This product utilizes a laser diode with the unit turned on, invisible laser radiation is emitted from the pickup
lens.
Wave length: 780 nm
Maximum output radiation power from pickup: 100 pWNDE
Laser radiation from the pickup lens is safety level, but be sure the followings: .
1. Do not disassemble the optical pickup unit, since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pickup unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Recommend not to look at pickup lens for a long time.
ACHTUNG: Dieses Produkt enthalt eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Leserstrahlung von der

Lasereinheit abgestrahlt.

Wellenlange: 780 nm
Maximale Strahlungsleistung der Lasereinheit: 100 pWNDE

Die Strahlung an der Lasereinheit ist ungeféhrlich, wenn folgende Punkte beachtet werden:

Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten'Laserdiode gefahrlich ist.
Den werkseitig justienen Einstellregler der Lasereinhit nicht verstellen.
Nicht mit optischen Instrumenten in die Fokussierlines blicken.

1
2.
3.
4 Nioht fiber langere Zeit in die Fokussierlines blicken.

RQLSD104
we INVISBLE uses mum mu om

ADVARSEL 5'

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VORSICHT mum

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CLASS 1
LASER PRODUCT

LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT

CAUTION!

THIS PRODUCT UTILIZES A LASER.

USE OF CONTROLS 0R ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN
THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

#2_

Page 3

ILocation of Controls

IHandling Precautions for Traverse Deck

SL-HDSS

® Disc tray
(2) Disc tray open/close button
(A OPEN/CLOSE)
@ CD-TEXT switch (CD TEXT)
@ One track all tracks swltch (TRACK)
@ Skip/search buttons (544/44, »/>>I)
© Stop button (I)
® Pause button (I I)
Play button and indlcator (V)
The color of the lamp on the D button depends on the operation.
If stopped: orange
it playing: green

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 traverse deck (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. The short land between the No. ® (GND) and No. GB (LD)
pins on the flexible board is shorted with a solder build-up
to prevent damage to the laser diode.

To connect to the PC board, be sure to open by removing
the solder build-up, and finish the work quickly.

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

4. Do not turn the variable resistor (laser power adjustment).

. It has already been adjusted.

. O Grounding for electrostatic breakdown prevention
1. Human body grounding

Use the anti-static wrist strap to discharge the static elec-
tricity trom your body.

2. Work table grounding
Put a conductive material (sheet) or steel sheet on the
area where the optical pickup is placed, and ground the
sheet.

Caution:

The static electricity of your clothes will not be grounded
through the wrist strap. 30, take care not to let your clothes
touch the traverse deck (optical pickup).

Flexible board (FFC) Lens
(Handle it carefully) (Do not touch)

No.®(LD GND) pin N 0. @(LD) pin Variable resistor.

(Do not turn)

\hkl/

1
7/
Iron plate or some metals

to conduct electricity