Technics SLP 470 Service Manual

Page 1

ORDER NO. AD900202202

Service Manual

nee

DIGITAL AUDIO

SPECIFICATIONS

I Audio
No. at channels
Frequency response

2 (leit and right, stereo)
2-20.000 H2, i115 dB

Output voltage 2 V (at 0 dB)
Dynamic range 96 dB
SIN ratio 96 dB

Total harmonic distortion 0.005% (1 kHz. 0 dB)
Harmonic distortion 0.003% (1 kHz. 0 :18)
Wow and flutter Below measurable limit
DA converter MASH (4 DAC)
Output impedance Approx. 6000
Load Impedance More than 10 k0
Headphone output level 15 mW max. 320 (adjustable)

l Pickup
Wavelength 780 nm

I CONTENTS

PLACEMENT...
ACCESSORIES
CONNECTIONS.
PRECAUTION OF LASER DIODE
LOCATION OF CONTROLS .......
HANDLING PRECAUTIONS FOR OPTICAL PICKUP
INSTRUCTIONS FOR TRAVERSE OIL

(Part No. SZZOL31) ................
DISASSEMBLY INSTRUCTION
MEASUREMENTS AND ADJUSTMENTS ..
NEW SERVO GAIN ADJUSTER

(Servo Amp. Adlusting Fixture)
FUNCTIONS OF IC TERMINALS.

Technics

Compact Disc Player

SL-P47O

Color

(K) Black Type
(S)...Siiver Type
Area
0823; Area Color
(E) Continental Europe. (K) (S)
I General
Power supply AC 50/60 Hz, 220 V
Power consumption 11 W
Dimensiona(W><278 mm
Weight 36 kg

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

MASH
oMASH (Mum-Stage Noise S_haping) is an effective over-
sampling D/A conversion technique which realizes a high
S/N ratio and needs no highly complex manufacturing
processes such as a laser trimming.

oMASH is a trademark of NTT (Nippon Telegraph and
Telephone Corporation),

DESCRIPTION OF FL PANEL.
BLOCK DIAGRAM
TERMINAL GUIDE
AND DIODES ...........
SCHEMATIC DIAGRAM.
PRINTED CIRCUIT BOARDS
WIRING CONNECTION DIAGRAM
TROUBLESHOOTING GUIDE...
REPLACEMENT PARTS LIS
EXPLODED VIEWS..
RESISTORS AND CA .
PACKING ...................................

Matsushita Electric industrial Co., Ltd.
Central P.O. Box 288, Osaka 530-91, Japan

Page 2

I PLACEMENT

Before placement

The optical pickup is secured to prevent damage during transport.
Be sure to release it before use

.->

Lock shaft
(in the locked
condition)

. Pull to unlock,
(with inclination!)

Notes of placement

l Place on a flat, level surface so that the front-rear
inclination does not exceed 5.

I Avoid places such as the following:

oNear any equipment or device that generates strong magnetism

OOn any heat-generating equipment or device, or in any place
where the temperature is high (40°C or higher).

0Extremely cold places (5°C or below).

cNear a tuner or TV (It may cause noise in the broadcast, or
disturbance of the TV picture)

I Do not place heavy oblects, other than system compo~
nents. on top of the unit.

Note: I When carrying or storing the unit, handle it with care so it is
when carrying this unit, be not subiected to any strong bumps.
sure to remove the compact Always remove the disc before storing the unit for any period of
disc from inside the unit, and time.
Press the lock She" 0 secure I To avoid problems due to vibration.
the optical pickup. (Make ODo not place a book or similar object under this unit.
sure to place the unit with the IDo not route the connection cables (of this or other units) across
rear panel facing downward.) the operation panel, across the top, or under the unit

Soft cloth or similar material (to prevent scratches)

- ACCESSORIES

0 AC power supply cord ............... 1 0 Stereo connection cable ........... 1
(SJA187) (SJP224e3)

' Remote control transmitter .......... 1 ¢ Batteries ........................... 2
(EUR64779) (UM-4NE/28)

I CONNECTIONS

Turn power oil on all components Deiore making connections.

Rear panel
of this unit
a a W E [-o 0
© @ [j I
LJ L__I
To CD or AUX" '
terminals of the (R) - --._ AC power supply cord AC outlet
amplifier (included) I 9

(Ll

Ft) Stereo connection cable
( (included) (sowo7)

Obs:

OOptical output terminal (DIGITAL OUT/OPTICAL) J _
This terminal can be used for connection with other equipment that Apparaten innehaller laser

CLASS 1
LASER PRODUCT
has a digital input terminal. such as an amplifier, by using an optical Komponent av hoger laserklass an

cable (optional). A dust-protection cap is inserted in this terminal. LUOKAN 1 LASERLAITE klass 1-

Remove this cap only when a connection is to be made to this
terminal.

Note:
The configuration of the AC outlet and AC power supply cord
differs according to area.

Page 21

- |0801 (MN6474): Digital filter & DIA converter

SL P470

Pin 0 Pin [/0 .
No. Mark Division Function No. Mark Division Function
1 MLD i Command load input (load: L) 23 DVDD1 | Power supply
2 RSTB | Reset command 24 DVSS1 - GND terminal (digital system)
3 IE I Not used, connected to GND 25 X2 0 Clock output
4 TP1 26 X1 | Clock input
0 TEST terminal
5 TP2 27 NC - Connected to GND
TEST terminal 1 28 DVDDZ | Power supply
6 TEST1 I (connected to GND)
29 DVSSZ - GND terminal (digital system)
TESTterminal 2
7 TESTZ I (connected to GND) Su b-strate terminal
30 NSUB | (Not used, connected to power
8 supply)
NC - Not connected
9 31 768 is O 768 f5 (33,8688MHZ)
(Not used, open)
10 AVDDA | Power supply
- 192 is (8.4672 MHz)
11 L (-) O Lch data output, (-) terminal 32 192is 0 (Not used, open)
12 AVSS4 LR clock selector (Not used,
- GND terminal 33 LRPOL connected to powersupply)
13 AVSSS
34 HR | LR discrimination signal input
14 L (+) O Lch data output, (+) terminal
35 SRCK | Serial bit clock input
15 AVD03 1 Power supply
36 SRDATA | Serial data input (MSB first)
16 NC - Not connected
37 DVSSS - GND terminal (digital system)
17 AVDDZ l Power supply
38 DVDD | Power supply
18 R (+) 0 Ron data output, (+) terminal
39 384% 0 38415 (16.9344MHZ) output
19 AVSSZ -
GND terminal (analog system) 40 PD | Powerdown terminal
20 AVSS1 - (Not used, connected to GND)
21 R (-) 0 Rch data output, (7) terminal 41 MDATA | Mode control data
22 AVDD1 | Power supply 42 MLCK | Data clock for MDATA

721,

Page 32

5 -P470

I TROUBLESHOOTING GUIDE

SL-P470 Operation Sequence Check Sheet

Play Operation Sequence

7

(with no disc loaded)

Forced traverse return

l

Disc detection

i

Stop

Disc loading

.1

Disc tray closed.

l

Laser diode comes on.

l

Focus pulled in.

l

Spindle motor starts rotation.

J

Focus servo operation

i

Tracking servo operation

i

Traverse servo operation

i

DSL (data slice) operation

i

PLL operation

i

CLV servo operation
(1 1T mode)

l

CLV servo operation
(phase compare mode)

i

TOC data display

L

Stop

PLAY key pressed.

i-
I Play operation
I-

V

_}
|

Laser diode comes on.

l

Focus pulls in.

T

Spindle motor starts rotation.

l

Focus servo operation

l

Traverse servo operation

l

DSL (data slice) operation

T

PLL operation

l

CLV servo operation
(1 1 T mode)

l

CLV servo operation
(phase compare mode)

i

Data demodulator circuit

operation

Access control circuit
operation

STOP key pressed

iggs

Stop