Technics SLPG 490 Service Manual

Page 1

ORDER NO. MBQ80100202

ervice Manual

COMPACT

DIGITAL AUDIO

MASH *

mum-siege norm shaping

Compact Disc Player

RAE11OOZ MECHANISM SERIES

Specifications

I Audio

No. of channels
Frequency response
Output voltage
Dynamic range

SIN

Harmonic distortion
Total harmonic distortion
Wow and flutter

DA converter

Output impedance
Load impedance
Headphone output level

I Pickup

Wavelength
Laser Power

2 (left and right, stereo)
2 - 20,000 Hz, :1 dB
2 V (at 0 dB)

92 dB

100 dB

0.005 % (1 kHz, 0 dB)
0.007 % (1 kHz, 0 dB)
Below measurable limit
MASH (1 bit)

1 k9

More than 10 k0

Max. 7.5 mW+7.5 mW/32 (2
(adjustable)

780 nm

No hazardous radiation is emitted

(with safety protection)

Compact Disc Player

SL-PG490

Colour
(K) ........ Black Type
Area
(E) .. .. Europe.
(EB) Britain.
(EG) ...... Germany
and Italy.

(EP) ...... Russia.

I General

Power consumption 13 W

Power supply AC 50/60 Hz, 230 - 240 V
Dimensions (WxHx D) 430 x92x283 mm
Weight 3.2 kg

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

For United Kingdom only:
This apparatus was produced to BS 800.

*

MASH is a trademark of NTT.

AWARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public. lt 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 sen/ice information by anyone else could result in serious injury or death.

Technics®

© 1998 Matsushita Electric industrial Co., Ltd,
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Page 2

SL-PG49L7

I Contents

Handling Precautions for Traverse Deck
Precaution of Laser Diode .
Accessories
Connections
Caution for AC Mains Lead
Front Panel Controls
Sequential Play .....
Operation Checks and

Main Component Replacement Procedures.
Self-Diagnostic Function ..............................

12.13

Schematic Diagram

Printed Circuit Board Diagram
Wiring Connection Diagram
Terminal Function of lCs
Troubleshooting Guide
Block Diagram ......
Cabinet Parts Location
Loading Unit Parts Location
Packaging ..........
Replacement Parts List

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 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 I

already 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).

FFC - \

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

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

i i" .
IT: :9,
Ell: l

Wrist strap
(Anti-static bracelet)
1 M n

ron plate or some metals
to conduct electricity

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 Precaution of Laser Diode

CAUTION:
Wave length: 780 nm

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 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 lock at pick up lens for a long time.

ACHTUNG: Dieses produkt enmalt eine laserdiode. [m eingeschalteten zustand wird unsichtbare laserstrahlung von der lasereinheit

adgestrahit.
Wellenlange: 780 nm

Maximale strahlungsleistung der laserinhelt: 100 pWNDE

Die strahlung an der lasereinheit ist ungetahrllch, wenn folgende punkte beachtet werden:

1. Die lasereinheit nicht zerlegen, da die strahlung an der treigelegten laserdiode getahriich ist.
2. Den werksseitig justienen einstellregler der lasereinreit nicht verstellen.
3. Nicht mit optischen instrumenten in die tokussierlinse blicken.

4. Nicht L'Iber langere zeit in die fokussierlinse blicken.

_2_

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Page 29

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Page 32

SL-PG490

Pans No.

RFKXEMSDL

I Loading Unit Parts Location

pans, apply the specified grease
to areas marked "xx" as shown

in the drawing.

When changing mechanism

Note:

Ref No.

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