Technics SLPG 540 A Service Manual

Page 1

ORDER NO. M8930104002

. Service Manual

Compact Disc Player

COMPACT
(filn§@ :D'G'W SL-PG54OA
é DIGITAL Auolo Colour
, * (K) .......... Black Type
mum-stage noise shaping
Area
5:33:10;- Area Colour
(E) Europe
._ (EB) Great Britain (K)
(EG) Germany and ltary

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

OMASH is a trademark of NTI'. -

SL-PG320A TRAVERSE DECK SERIES (RAD0301-1)

Total harmonic distortion
Wow and flutter

DA converter

Output impedance

Load impedance
Headphone output level

0t0027% (1 kHz, 0 dB)
Below measurable limit
MASH (1 bit)

6000

More than 10 kn

15 mW max. 320 (adjustable)

Technics

SPECIFICATIONS

(om 45 500)

I Audio I Pickup

No. of channels 2 (left and right, stereo) Wavelength 780 nm
Frequency response 2-20,000 Hz, iots dB Laser Power No hazardous radiation is emitted
Output voltage 2 V (at 0 dB) (with safety protection)
Dynamic range 98 dB

S/N 105 dB I General

Harmonic distortion 0(002% (1 kHz, 0 dB) Power consumption 10 W

Power supply AC 50/60 Hz, 230-240 V
Dimensions (WX HXD) 430x92x298 mm
Weight 3.6 kg

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

Page 2

SL-PG540A

I CONTENTS

HANDLING PRECAUTIONS FOR TRAVERSE DECK . .
PRECAUTION OF LASER DIODE
ACCESSORIES
INSTALLATION
CAUTION FOR AC MAINS LEAD .
CONCERNING COMPACT DISCS . .
CLEANING OF LENS ...............
CONNECTIONS ..........
LOCATION OF CONTROLS .........
BASIC OPERATING PROCEDURE . . .
DISASSEMBLY INSTRUCTIONS . ..
CHECKING OFTHE SERVO P.C.B..

(it

Pay

onxlmmm-Aoammw

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

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 oi cloth es or

human body.

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

IHandling oi 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
irom 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 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).

Clip shorting pin
r - - '1 r " - 'l
I I
I I i Qt
t... _ .J L- _ _i
Be sure to short this portion

(Use the shorting pin or clip)

Lens (Do not touch) I,

Wrist strap
(Antirstatic bracelet)

1Mfl

Iron plate or some metals
to conduct electricity

I 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 optical pick up unit, since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pickup 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 enthalt eine laserdiode. lm eingeschalteten zustand wird unsichtbare laserstrahlung von der lasereinheit abgestrahlt.

Wellenlange: 780 nm
Maximale strahlungsleistung der laserinhelt: 100 pWNDE

Die strahlung an der Iasereinheit ist ungetahrllch. wenn folgende punkte beachtet warden:

. Die lasereinheit nicht zerlegen, da die strahlung an derfreigelegten laserdiode gefahriich ist.
. Den werksseitig justierten einstellregler der lasereinreit nicht verstellen.

. Nicht mit optischen instrumenten in die fokussierlinse blicken.

. Nicht fiber tangere zeit in die fokussierlinse blicken.

Amie-

_2_