Technics SLPD 647 Service Manual

Page 1

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Service Manual

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DIGITAL AUDIO

NEW MECHANISM SERIES
(RAE0301: Type AIRAE0302: Type B)

SPECIFICATIONS

I Audio
No. ol channels
Frequency response

2 (left and right, stereo)
2-20,000 Hz, 1'1 dB

Output voltage 2 V (an 0 (18)
Dynamic range 92dB
SIN 100dB

Total harmonic distortion
Wow and flutter

DA converter

Output impedance

Load impedance

0.007% (1 kHz, OdB)
Below measurable limit
MASH (1 bit)

Approx. 1k!)

More than 10kQ

I CONTENTS
Page

PRECAUTION OF LASER DIODE ..................................................
ACCESSORIES
CONNECTIONS.
FRONT PANEL CONTROLS AND FUNCTION
BEFORE MOVING ..............................................
HANDLING PRECAUTIONS FOR OPTICAL PICKUP
INSTRUCTIONS FOR TRAVERSE OIL
DISASSEMBLY INSTRUCTIONS .....
HOW TO CHECK THE MAIN AND SERVO P.C.B.
OPERATING THE UNIT WITHOUT THE FRONT PANEL

ASSY (OPERATING P.C.B. AND KEYS) .............
DISPLAY FUNCTION OF AUTOMATICALLY-ADJUSTED

RESULTS (SELF-CHECK FUNCTION
NEW DIGITAL SERVO CIRCUIT..

Technics

19, 20

Compact Disc Changer

SI.- PD647

Colour
(K) Black Type

Area
Suffix for
Model No. Area Colour
(E) Europe.
Asia, Latin America,
(GC) Middle Near East (K)
and Africa.
(GN) Oceania.

>.< -Technics (or Panasonic) developed the world's first MASH
lype DAC and ADC. MASH technology was invented by
NTT (LSI Labs).

0 MASH is a trademark of NTT.

I Pickup

Wavelength 780 nm
I General

Power consumption 15W

Power supply
For (E, GN) areas.: AC 50/60 Hz. 230~240V
For (GC) area: AC 50/60HZ,110V/127V/220V/240V
Dimensions (w x H x D) 430 x130 x 401 mm

Weight 5.0 kg

Note:

Design and specifications are subiect to change without notice.
Weight and dimensions are approximate

NEW DIGITAL SERVO SYSTEM
TROUBLESHOOTING GUIDE...

'1
MEASUREMENTS AND ADJUSTMENTS 25, 26
TERMINAL FUNCTION OF ICS 27~30
BLOCK DIAGRAM ........ 31~33

SCHEMATIC DIAGRAM
PRINTED CIRCUIT BOARDS 40~43
WIRING CONNECTION DIAG
INTERNAL CONNECTION OF FL
REPLACEMENT PARTS LIST ......
PACKAGING
EXPLODED VIEWS .....................
RESISTORS AND CAPACITOR

Page 2

SL-PDG47

IPRECAUTION OF LASER DIODE

CAUTION:

ACHTUNG

This product utilizes a laser diode with the unit turned on", invisible laser radiation is emitted from
the pickup lens.

Wave length: 780nm

Maximum output radiation power from pickup: 100uW/VDE

Laser radiation from the pickup lens is safety level, but be sure the followings:

1. Do not disassemble the optical pickup 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 look at the focus lens using optical Instruments.

4. Recommend not to look at pickup lens for a long time.

: Dieses Produkt enthalt eine Laserdiode. lm eingeschalteten Zustand wlrd unsichtbare Laser-
strahlung von der Lasereinheit abgestrahlt.

Wellenlange: 780nm
Maximale Strahlungsleistung der Lasereinheit: 100pW/VDE

Die Strahlung an der Lasereinheit lst ungeféhrlich, wenn folgende Punkte beachtet werden:

1. Die Lasereinheit nlcht zerlegen, da die Strahlung an der freigelegten Laserdiode gefahrlich ist.
2. Den werkseitig justierten Einstellregler der Lasereinheit nicht verstellen.

3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.

4. Nicht fiber Iangere Zeit in die Fokussierlinse blicken.

ADVARSEL: I dette a apparat anvendes laser.

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