Technics SLPG 570 A Service Manual

Page 1

ORDER NO MB950200302

.Service Manual

Compact Disc Player

@figfé DIGIT/IL

DIGITAL AUDIO A S H *

mutt! - stage noise shaping

RAE11OOZ MECHANISM SERIES

Specifications

I Audio
No. of channels
Frequency response

2 (left and right. stereo)
2 - 20,000 Hz, : 0.5 dB

Output voltage 2 V (at 0 dB)
Dynamic range 96 dB
SIN 100 dB

Harmonic distortion
Total harmonic distortion
Wow and flutter

DA converter

Output impedance

Load impedance
Headphone output level

I Pickup
. Wavelength
Laser Power

0.0035% (1 kHz. 0 dB)
0.004% (1 kHz. 0 dB)
Below measurable limit
MASH (1 bit)

1 k9

More than 10 kg

15 mW max. 32 9 (adjustable)

780 nm

No hazardous radiation is emitted

(with safety protection)

Compact Disc Player

SL-PG57OA

Colour
(K) : Black
Areas
Suffix for
Mo det No, Area Colour
(E) Europe
(EB) Britain
(EG) Germany and ltaly (K)
(ER) Hungary
(EZ) Poland and Russia
I General
Power consumption 13 W
Power supply AC 50/60 Hz, 230 - 240 V
Dimensions (W x H x D) 430 X103 X 288 mm
Weight 3.5 kg
Notes:

Specifications are subject to change without notice.
Weight and dimensions are approximate,

This apparatus was produced to BS 800,

5

O MASH is a trademark of NTT.

AWAHNING
This service information is designed for experienced repair technicians only and is not designed for use bythe general public. It does not
contain warnings 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.

~ Technics®

© 1995 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Page 2

SL-PGS70A
I Contents

' Handling Precautions for Traverse Deck
0 Precaution of Laser Diode
0 Accessories.
O Connections
0 Caution for AC Mains Lead
0 Location of Controls .........
0 Basic Operating Procedure
0 Operation Check and

Main Component Replacement Procedures .....
0 Automatic Adjustment Results Display Function.

Page
15~20
21. 22

0 Schematic Diagram ..................................
0 Printed Circuit Board Diagram

0 Wiring Connection Diagram . 23
0 Block Diagram .................. 24. 25
'Troubleshooting Guide. . 26. 27
0 Function of IC Terminals. 28~30
G Replacement Parts List 31 ~37
I Cabinet Parts Location . 34. 35
0 Loadiong Unit Parts Location. . 36
0 Packaging ............................ . 37

I Handing Rrecautions 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 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. To prevent the breakdown of the laser diode. an anti-static shorting
pin is inserted into the flexible board (FFC board).
When removing or connecting the short pin. finish the job in as short
time as possible.

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 al-
ready been adjusted.

o 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 on the area where the
traverse deck (optical pickup) is placed. 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).

I Precaution of Laser Diode

CAUTION:
Wave length: 780 nm

FFC

Lens (Do not touch) .
(Handle It carefully)

Be sure to short this portion
(Use the shorting pin or clip)

Wrist strap
(Anti-static bracelet) '

1M0

n plate crsome metals to
conduct electricity

This product utilizes a laser diode with the unit turned on". invisible laser radiation is emitted from the pick up lens,

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 lock at the focus lens using optical instruments.

4. Hecommend not to look at pick up lens for a long time.

ACHTUNG:
adgestrahit.
Wellenlange: 780 nm

Dieses produkt enthalt eine Iaserdiode. lm eingeschalteten zustand wird unsichtbare laserstrahlung von der Iasereinheit

Maximale strahlungsleistung der laserinhelt: 100 uWNDE

Die strahlung an der lasereinheit ist ungefahrllch. wenn folgende punkte beachtet werden:

1. Die lasereinheit nicht zerlegen. da die strahlung an der freigelegten laserdiode gefahriich ist.
2. Den werksseitig justierten einstellregler der Iasereinreit nicht verstellen.
3. Nicht mit optischen instrumenten in die fokussierlinse blicken.

4. Nicht iiber Iéngere zeit in die fokussierlinse blicken.