Technics SLPG 440 A Service Manual

Page 1

ORDER NO. M8930103902 *7

ervice Manual

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DIGITAL AUDIO

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OTechnics (or Panasonic) developed the worlds first MASH
type DAC and ADC. MASH technology was invented by
NTl' (LSI Labs).

OMASH is a trademark of MT

Compact Disc Player

SL-PG44OA

Colour
(K) .......... Black Type
Area
Suffix for
Model No. Area Colour
(E) Europe
(EB) Great Britain (K)
(EG) Germany and Italy

SL-PG320A TRAVERSE DECK SERIES (RAD0301-1)

SPECIFICATIONS

(DIN 45 500)

I Audio

No. of channels 2 (left and right, stereo)
Frequency response 240,000 Hz, 10.5 dB
Output voltage 2 V (at 0 dB)
Dynamic range 98 dB
S/N 100 dB

Harmonic distortion
Total harmonic distortion
Wow and flutter

DA converter

Output impedance

Load impedance
Headphone output level

0.0022% (1 kHz, 0 dB)
0.0035% (1 kHz, 0 dB)
Below measurable limit
MASH (1 bit)

600!)

More than 10 k0

15 mW max. 320 (adjustable)

Technics

I Pickup

Wavelength 780 nm

Laser Power No hazardous radiation is emitted
(with safety protection)

I General

Power consumption 10 W

Power supply AC 50/60 Hz, 230-240 V

Dimensions (WxHxD) 430x92x290 mm

Weight - 3.6 kg

Note:

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

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7 SL-PG44OA

I CONTENTS

HANDLING PRECAUTIONS FOR TRAVERSE DECK . . . .

Page

PRECAUTION 0F LASER DIODE

ACCESSORIES

INSTALLATION . .

CAUTION FOR AC MAINS LEAD ..... 4
CONCERNING COMPACT DISCS . .. 5
CLEANING OF LENS ........... 5

CONNECTIONS ...................
LOCATION OF CONTROLS .........
BASIC OPERATING PROCEDURE .
DISASSEMBLY INSTRUCTIONS ,. .
CHECKING OF THE SERVO P.C.B..

CHECKING OFTHE MAIN P.C.B ..........
BLOCK DIAGRAM
SCHEMATIC DIAGRAM .................
PRINTED CIRCUIT BOARD DIAGRAM .
WIRING CONNECTION DIAGRAM .......
TROUBLESHOOTING GUIDE ...........
MEASUREMENTS AND ADJUSTMENTS .
TERMINAL FUNCTION OF IC'S
REPLACEMENT PARTS LIST
LOADING UNIT PARTS LOCATION .
CABINET PARTS LOCATION

I HANDLING PRECAUTIONS FOR TRAVERSE DECK

The laser diode in the traverse deck (optical pickup) may break down due to potential ditlerence caused by static electricity of clothes or

human body.

So, be caretul of electrostatic breakdown during repair ol the traverse deck (optical pickup).

OHandling ot 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 (FPC 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 (FPC
board).
OGroundlng tor 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 conductive material (sheet) or steel sheet on the area where
the traverse deck (optical pickup) is placed. and ground the sheet.
Caution:
The static electricity at your clothes will not be grounded through the
wrist strap. So. take care not to let your clothes touch the traverse
deck (optical pickup).

Clip shorting pin
- - -| l- - - 1

l9!

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

I
I t
t l
L-_J

Lens (Do not touch)

Wrist strap
(Anti-static bracelet)

IMQ

Iron plate or some metals
to conduct electricity

I PRECAUTION OF LASER DIODE

CAUTION:
Wavelength: 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 uWNDE

Laser radiation from the pick Up unit is safety level, but be sure the followings:

eulo-

. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous.
t Do not adjust the variable resistor on the pickup unit. It was already adjusted.

. Do not look at the tocus lens using optical instruments

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

ACHTUNG: Disses produkt enthélt eine laserdiode. lm eingeschalteten zustand wird unsichtbare laserstrahlung von der lasereinheit abgestrahlt.

Wellenlange: 730 nm

Maximale strahlungsleistung der laserinhelt: 100 pW/VDE

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

band

. Nicht iiber langere zeit in die fokussierlinse blicken.

. Die lasereinheit nicht zerlegen, da die strahlung an der freigelegten laserdiode getahriich ist.
. Den werksseitig justierten einstellregler der lasereinreit nichtverstellen.
t Nicht mit optischen instrumenten in die tokussierlinse blicken.

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