Technics SLPG 480 A Service Manual

Page 1

H

ORDER NO. MBQSOZOOZCZ

Service Manual

Compact Disc Player

[flfigé DIEIT/IL

DIGITAL AUDIO MAS H *

multinslngo noise shaping

RAE11 OOZ MECHANISM SERIES

Specifications

I Audio

No of channels
FrequenCy response
Output voltage
Dynamic range

SIN

Harmonic distortion
Total harmonic distortion
Wow and flutter I
DA converter
Output impedance
Load impedance

I Pickup
Wavelength
Laser Power

2 (left and right. stereo)
2 - 20,000 Hz. 2 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 kg

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

Compact Disc Player

SL-PG480A

Colour
(K) : Black
Areas
Suffix for
Model No. Area Colour
(E) Europe
(EB) Britain (K)
(EG) Germany and Italy
I General
Power consumption 13 W

Power supply AC 50/60 Hz. 230 ~ 240 V
Dimensions (W X H x D) 450 x 92 x 283 mm
Weight 3.1 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.

>:<
0 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 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®

© 1996 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Page 2

SL-PG480A

I Contents

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

Main Component Replacement Procedures
Automatic Adjustment Results Display Function

Schematic Diagram ...........
Printed Circuit Board Diagram
Wiring Connection Diagram
Function of IC Terminals
Block Diagram .............
Troubleshooting Guide
Replacement Parts Lis
Cabinet Parts Location
Loading Unit Parts Looatio
Packaging .......................

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 of electrostatic breakdown during repair of the traverse desk (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).

l 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)

conduct electricity

This product utilizes a laser diode with the unit turned on'fi 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 look at the focus lens using optical instruments.

4. Recommend not to lock at pick up lens for a long time.

ACHTUNG: Dieses produkt enthalt eine laserdiode. lm eingeschalteten zustand wird unsiohtbare laserstrahlung von der lasereinheit

adgestrahit.
Wellenlange: 780 nm

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 let.
2, Den werksseitig justierten einstellregler der Iasereinreit nicht verstellen.
3. Nicht mit optischen instrumenten in die fokussierlinse blicken.

4, Nicht fiber Iangere zeit in die fokussierlinse blicken.

H

H

Page 9

U

U

SL-PG480A

2. Checking for the servo P.C.B.

Remove the
cabinet.

Pull out the front
panel assy.

Place the loading unit as
shown below.

Reinstall the front panel assy

'9 to set.
6

Lift up the loading unit.

6):»)- 6

[RH030035-K1] (Black)
@mm 0
[XTBSS+8Jl71] (Black)
@mm» 0
[XTB3+1 0.1sz (Black)

@mm 0

[XTB3+8JFZ] (Black)