Technics SLPG 370 A Service Manual

Page 1

ORDER NO.M59502001C2

Service Manual

Compact Disc Player

COMPACT

DIEIT/IL

DIGITAL AUDIO MAS H *

mum - mg. noise shaping

RAE11OOZ MECHANISM SERIES

Specifications

I Audio
No. of channels
Frequency response

2 (left and right, stereo)
2 - 20,000 Hz, 2 1 :15

Output voltage 2 V (at 0 dB)
Dynamic range 92 dB
S/N 100 dB

Harmonic distortion
Total harmonic distortion

0.005% (1 kHz. 0 dB)
0.007% (1 kHz, 0 dB)

Wow and flutter Below measurable limit
DA converter MASH (1 bit)
Output impedance 1 kn

Load impedance More than 10 k9

I Pickup
Wavelength
Laser Power

- 780 nm
No hazardous radiation is emitted
(with safety protection)

Compact Disc Player

SL-PG37OA

Colour
(K) : Black
Areas
Suffix for C
Model No. Area oiour
(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 (Wx H x D) 430 x 92 x 288 mm
Weight 3.1 kg
Notes:

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

This apparatus was produced to BS 800.

>2<

O MASH is a trademark of NTT.

AWAFINING
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 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

VSL-PGS70A l
I Contents

0 Handling Precautions for Traverse Deck .
0 Precaution of Laser Diode

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

0 Accessories .. 0 Wiring Connection Diagram . 22
0 Connections . 0 Function of IC Terminals 23~25
0 Caution for AC Mains Lead 0 Block Diagram .. 26, 27
0 Location of Controls ....... 0 Troubleshooting Gurde 28, 29
0 Basic Operating Procedure 0 Replacement Parts List . 30~35

0 Operation Check and 0 Cabinet Parts Location ..
Main Component Replacement Procedures 0 Loadiong Unit Parts Location
0 Automatic Adjustment Results Display Function 0 Packaging ..........................

I Handing 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 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 electrostatlc breakdown prevention .

1. Human body grounding j
Use the anti-static wrist strap to discharge the static electricity from 1.
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. 30, take care not to let your clothes touch the traverse deck

(optical pickup).

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

7
Iron plate or some metals to
conduct electn'city

l 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 a long time.

ACHTUNG: Dieses produkt enthalt eine laserdiode. lrn eingeschalteten zustand wird unsichtbare laserstrahlung von der lasereinheit
adgestrahit.
Wellenlange: 780 nm
Maximale strahlungsleislung der laserinhelt: 100 MWNDE

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

1 . Die lasereinheit nicht zerlegen. da die strahlung an der freigelegten laserdiode geiahriich let
2, Den werksseitig justierten einstellregler der lasereinreit nicht verstellen.

3. Nicht mit optischen instrumenten in die fokussierlinse blicken.

4. Nicht fiber lingere zeit in die tckussierlinse blicken.