Technics SLP 377 A Service Manual

Page 1

ORDER NO M89002003C2

Service Manual

nee e:

DIGITAL AUDIO

l SPECIFICATIONS

I Audio

No, of channels 2 (left and right, stereo)
Frequency response 2-20.000 Hz :05 dB
Output voltage 2 V (at 0 dB)
Dynamic range 96 dB
S/N ratio 98 dB

Total harmonic distortion
Harmonic distortion
Wow and flutter

DA converter

Output impedance

Load impedance
Headphone output level

0.004%(1 kHz, 0 dB)

0 003% (1 kHz. 0 dB}

Below measurable limit
MASH (4 DAC)

Approx 6000

More than 10 k!)

15 mW max. 320 (adjustable)

MASH
IMASH (Mum-Stage Noise gaping) 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
Terephone Corporation).

I CONTENTS

Page
PLACEMENT .............................. 2
CLEANING 0F LENS
ACCESSORIES ............
PRECAUTION 0F LASER DIODE
LOCATION OF CONTROLS . . .
CONNECTIONS ..........
DISASSEMBLY INSTRUCTIONS ........
MEASUREMENTS AND ADJUSTMENTS t .
TERMINAL FUNCTIONS OF ICS
INTERNAL CONNECTION OF FL t
BLOCK DIAGRAM

Technics

Compact Disc Player

SL-P377A

Color
(K) Black Type

Area

Country
Code Area Color

(E) Continental Europe. (K)
(EB) Great Britain; (K)
(EG) F.R. Germany & ltalyt (K)

I Pickup
Wavelength 780 nm

I Infrared remote control transmitter

Dimensions (WXHXDI 60xt8x165 mm

Batteries UM-4 AAA" batteries or lEC R03
or equrvalent (I 5 Vx2)
Weight 100 g (inducing batteries)
I General
Power supply
For Great Britain: AC 50/60 Hz, 240V
For others: AC 50/60 Hz, 220V
Power consumption 10 W
Dimensions (WXHXD) 430><287 mm
Weight 3.6 kg

Specillcations subject to change Without notice
Weight and dimensions shown are approximate.

TERMINAL GUIDE OF IC'S,

TRANSISTORS& DIODES ............... _ . . . 28
PRINTED CIRCUIT BOARDS ........
WIRING CONNECTION DIAGRAM t
REPLACEMENT PARTS LIST .....
EXPLODED VIEWS ...........
RESISTORS 81 CAPACITORS .....
PACKING .................
TROUBLESHOOTING GUIDE . .
* TECHCNICAL INFORMATION
This technical information is located on pp 49 N 56 of the

SLVPJ46A Service Manual (Order No. ADBQOZOSBCZ).
Therefore, refer to that Servrce Manual.

Matsushita Electric industrial Co. , Ltd.
Central P 0 Box 288, Osaka 530-91, Japan

Page 2

SL-P377A

I PLACEMENT

I Before placement I

Two transpon security devices are secured to prevent the optical
pickup from damage during transport.
Be sure to release them before use.

LOCKED RELEASED

Insert them here after removing.
Turn clockwise by 90° to secure
them.

Soft cloth or similar material (to
prevent scratches)

Note:

When transporting the unit, be sure to remove the compact disc
from inside the unit. And replace the transport security devices
again following the reverse order not to damage the optical pickup.

I CLEANING 0F LENS

If the lens is stained causing sound skip or operation failure,
open the top cover by pressing the open button, and clean
the lens.

0 To remove dust or dirt
Blow the lens with the blower provided in the cleaning kit
to remove dust or dirt.

Dust or dirt

Fingerprint

0 To remove fingerprint

It the blower is not enough, moisten the cotton rod
with the lens cleaner solution and wipe the lens with it
from center of the lens to outside,

I ACCESSORIES

o ACpower supply cord .......... 1
[SJA187 (E, EG)]
SJA193 (EB)

0 Remote control transmitter ....... 1

EUR64796 (Kl ]
EUR64797 (S)

I Notes of placement j

I This unit is a preclsion instrument. Be sure to place it on a
flat surface.
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 (35°C or higher).
OEXtremely cold places (5°C or below).
ONear a tuner or TV (It may cause noise in the broadcast, or
disturbance of the TV picture.)
I When carrying or storing the unit. handle it with care so it is
not subjected to any strong humps.
Always remove the disc before storing the unit for any period of
time.
I To avoid problems due to vibration.
'00 not place a book or similar object under this unit.
000 not route the connection cables (of this or other units) across
the operation panel, across the top. or under the unit.

Cautions:
0 Do not directly apply the cleaner solution to the lens.

Do not apply too much solution to the cotton rod or
otherwise the solution will flow into the player.

Wipe the lens carefully. Do not give too much stress to
the lens or otherwise it may scratch the lens or cause
optical pickup trouble.

If the solution should be too much applied, wipe the
lens with a dry cotton rod.

Lens cleaning kit (Part No. : SZZP1D38C)

Cleaner

Blower

0 Stereo connection cable .......... 1
(SJP2249-3l

0 Batteries ...................... 2
(UM-4N E/2Sl

Page 35

SL-P377A

(Operation Sequence Just After Power On) (T OC Read Operation-PLAY Operation)

Power On OpenIClose switch
(no disc loaded) pressed.

(D Microprocessor failure
(10401)

® Operation key switch failure

(:9 Tray switch failure

CD Power supply failure:
No -Voltage regulator CH.
12, 013 ~ 16)
- iC protector (lCP1,2,1 1,12)
® Microprocessor failure:
- lC401

Has the tray opened
and stopped?

FL display came on?

Yes

Load a disc and press
the 0penlC|ose switch.

Yes

CU Microprocessor failure
(ICAO1)

(2) Operation key switch failure

®Tray switch failure

Has the tray closed
and stopped?

® Microprocessor failure:
- |C401

® Loading motor driver failure:
0 |C402, motor

(3) Tray switch failure

Tray closed? (D Pickup failure:
. Laser diode
N0 (3 Control system failure:
0 |C6501, 06502
@ Microprocessor failure:
'10401
- Laser diode turn-on check method -
Remove the disc then close the tray,
and the laser diode will come on for
approx. 5 sec.

Laser diode came on?

Yes

(D Radial control system
failure:

Does optical

pickup move toward 6) Microprocessor failure:

inner track? - |C6504, Radial motor 0401
' - iC401 potentiometer Does focus lens ®ffgérglosyslem failure:

make venical

movements? @ FO error amp. failure:

0 lC6501, |C6504
8 Pickup failure:
- Focus coil

Stops after making focus pull-
in operation for approx. 5 sec.

Li) Microprocessor failure;
0 |CAO1
[2) T.T. drive system failure:
0 ICSOL 402. 0351
Turntable motor

Spindle motor
started rotation?

_45_