Technics SLSW 404 Service Manual

Page 1

l l

ORDER NO. AD960511908

Service Manual

Portable CD Player

MASH SL- SW404

>.<- . MASH is a trademark of NTT.

Colour (A)...Biue Type

Areas
(EB) ............. Great Britain.
(EG) ............. Europe.
(GN) ............. Oceania.
Traverse Deck: RAE01412 Mechanism Series
Specifications
Audio General
No. of channels: 2 channels (left and right. stereo) Power requirement:
Output voltage: 0.6 V(50 kohm) diameter 3.5 stereo minijack AC; with an included panasonic AC adaptor
Frequency response: 20~20,000 Hz (1-0.5 dB, 4.5 dB) RFEA401E-zs ( EG)
SIN: more than 94 dB RFEA404B~1W (EB)
Wow and flutter: Below measurable limit RFEA403A-S (GN)
DA converter: 1 bit, MASH* Batteries; DC 3 V (two AA" size batteries,not included)
Headphone output level: max. 9 mW+9 mW/16 ohm (variable) (Panasonic R6P/LR6 or equivalent, not included)
stereo mini jack diameter 3.5 Rechargeable Batteries; DC 2.4 V with an optional Panasonic
Digital filter: 8 times over sampling Rechargeable Batteries (SH-CDBBD set of 2)
Signal Format Dia;NBattery; WIth an optIogaé liege/amt: car adaptor (SH-CD09)
Correction system: Technics New Operation temperature '
Super Decoding Algorithm range: 0- 40 degree
Pickup Rechargeable
Type: One beam temperature range: 5-40 degree
Light source: Semiconductor laser Power supply: DC 4.5 V
Wavelength: 780 nm Power consumption:
Lens: Glass pressed lens Power source; Extra anti-shock OFF/ON

Using AC adaptor; 5.5 Wl5t7W

Playing time; (When used in hold mode. at 25 degree temperature Dimensions (waxD): 133x31.5x150.5 mm

Weight: 312 9 without batteries
and on flat and stable surface.) 357 g with batteries

Batteries used Extra anti-shock OFF/ON *These specifications were measured in the extra anti-shock OFF

Rechargeable batteries About 3 hours/ , mode.

. _ AbOUt 2 hours 30 minutes Note: Design and specifications are subject to change without notice.

Panasomo alkalIne dry AWL 10 hours] , Weight and dimensions are approximate.

cell batteries About 7 hours 30 mInutes

The play time may be less depending on the operating conditions.
Recharging time; About 3 hours

A WARNING

This service information is designed ior experienced repair technicians only and is not designed for use by the general public. it
does not contain warnings or cautions to advise non- -technicai individuals of potential dangers In attempting to service a product
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt within this service information by anyone else could result In serious injury or death.

© 1996 Matsushita Electric industrial Co., Ltd.

- ® All rights reserved. Unauthorized copying and
anasonlc distribution is a violation of law.

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SL-SW404

IContents

Precaution of Laser Diode.
Accessories
Location of Controls ......
Power Supply Preparations
Accidental Operation Prevention Function
Sequential Play ........................................
Using the Unit with Optionaim Accessories
Extra Anti-shock Function... ... ..
Cautions 7

Handling Precautions for Traverse Deck ....................................... 8
Operation Checks and Main

Component Replacement Procedures ............................. 9~ 1 2
Checking the Operation Problems on

the Traverse Deck (Optical Pickup) 13

IPrecaution of Laser Diode

CAUTION:
lens.
Wave length: 780 nm

Automatic Adjustment Results

Display Function (Self-check Function)
Mesurements and Adjustments .
Block Diagram ........
Schematic Diagram
Printed Circuit Board and

Wiring Connection Diagram.
Repairing the Printed Resistor
Terminal Guide
Cabinet Parts Location .
Replacement Parts List.
Resistors and Capacitors .
Packaging

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

Maximum output radiation power from pickup: 100 pWNDE

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 along time.

ACHTUNG: Dieses Produkt enthait eine Laserdiode.

Lasereinheit abgestrahlt.

Weilenlange1750 nm

lm eingeschaiteten Zustand wlrd unsichtbare Leserstrahlung von der

Maximale Strahlungsieistung der Lasereinheit: 100 pW/VDE

Die Strahlung an der Laserelnheit ist ungefahriich, wenn folgende Punkte beachtet werden:

PWNT

ADVARSEL: l dette a apparat anvendes laser.

VARDl Avallaessa ja DANGER-invisible laser

snolaluklins oniiellaessa

ggggglmgkvmm" IiIIIléliI'éfi'eIfifilea.

Ali lialsn sileesen, AVOID DIRECT EX-
POSURE T0 BEAM.

VARNINGl Dsynllg
lascrslrilnin nirtlenna
daiirfipgn: not:
warm rurkn rylad.
Beiralrlu e] siréen

(Bottom ol the producl)

(Pesal under apparatet)

ADVERSEL! Usynlia
inszvslréling nér dam!
tunes nu sikkemedslés
Myles. Linnea
elispnnering Iur slréien.

fiuolteen pohjassa)
(Apparalens underside)
(Produklets underside)

Bottom of the unit

Pane interior del aparato
Apparalens undersida
Komponenlens underside
Produklets underside

LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT

ADVARSEL: USYNLIG LASERSTHALING
iIED ABNING, NAH SIKKEHHEDSAF-

BRYDEHE EFl UDE AF FUNKTION.
UNDGA UDSETTELSE FDR STRALING.

Die Lasereinheit nicht zerlegen, da die Strahlung an der freigeiegten Laserdiode gefahrlich ist.
Den werkseitig justierten Einsteiiregier der Lasereinhit nicht verstelien.

Nicht mit optischen instrumenten in die Fokussierlines blicken.

Nicht iiber langere Zeit in die Fokussierlines blicken.

CAUTION!

THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUST-
MENTS OR PERFORMANCE OF
PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN
HAZARDOUS RADIATION EXPO-
SURE.

DO NOT OPEN COVERS AND DO NOT
REPAIR YOURSELF. REFER SERVIC-
ING TO QUALIFIED PERSONNEL.

Marking sign is located on bottom of the
unit.

CLASS 1
LASER PRODUCT

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SL-SW404

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 of
clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).

0 Handling of traverse deck (optical pickup)

1.

2.

Do not subject the traverse deck (optical pickup) to static
electricity as it is extremely sensitive to electrical shock.
The short land between the No. (D (LD) and No. (9 (GND)
pins on the flexible board (FFC) is shorted with a solder
build-up to prevent damage to the laser diode.

To connect to the PC board, be sure to open by removing
the solder build-up, and finish the work quickly.

Take care not to apply excessive stress to the flexible
board (FFC).

Do not turn the variable resistor (laser power adjustment).
It has already been adjusted.

I Grounding for electrostatic breakdown prevention

1.

Human body grounding

Use the anti-static wrist strap to discharge the static
electricity from your body.

Work table grounding

Put a conductive material (sheet) or steel sheet on the
area where the optical pickup is placed, and ground the
sheet.

Cautlon:

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).

Flexible board (FFC)
(Handle it carefully) ' (D0

No.

Lens
not touch)

I
/ Variable resistor

(53 (GND) pin No. @(LD) pin

(Do not turn)

Iron plate or some metals
to conduct electricity

i i

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SL-SW404

ISchematic Diagram (See parts list on pages 35~37.)
(This schematic diagram may be modified at any time with the development of new technology.)

Notes:
0 $201 : Laser ON/OFF switch in OFF position.
(It turns "ON" with disc holder closed.)

0 $202: Ftest detector in OFF" position.

(It turns 0N" when optical pickup comes to
innermost periphery.)

0 S301 : Memory/recall (MEMORY/RECALL) switch.

0 $302: Repeat (REPEAT) switch.

0 S303, 304: Skip/search (H4 -SKlP/--SEARCH DH ) switches.

(8303: »i, 8304: m)

o 8305: Stop/power oft ( l POWER OFF) switch.

08306: Play/pause ( p || ) switch.

0 5307: Play mode selector (MODE) in RANDOM" position.

(RANDOMHNORMALQRESUME)

08308: Hold (HOLD) switch in "ON" position.

0 5501: Extra anti-shock switch in ON" position.

0 S701: XBS selector in ON position.

O The voltage value and waveforms are the reference voltage of
this measured by DC electronic voltmeter (high impedance)
and oscilloscope on the basis of GND terminal (DC iN Jack).
Accordingly, there may arise some errors in the voltage values
and waveforms depending upon the internal impedance of the
tester or measuring unit.

*The parenthesized is the voltage for test disc (1 kHz, L+R,
0 dB) in play mode, and the other, for no disc in stop mode.

* AC adaptor is used for power supply.

0 m :Positive voltage lines.

0 => :Audio signal lines.

0 important safety notice:
Components identified by A mark have special characteristics
important for safety. Furthermore, special parts which have
purposes of fire-retardant (resistors), high-quality sound
(capacitors), low-noise (resistors), etc. are used. When
replacing any of components, be sure to use only manufactures
specified parts shown in the parts list.

0 it marks indicate printed resistor.

Caution!

IC and LS! are sensitive to static electricity.

Secondary trouble can be prevented by taking care during repair.
0 Cover the parts boxes made of plastics with aluminum foil,

0 Ground the soldering iron.

0 Put a conductive mat on the work table.

0 Do not touch the pins of IC or LSI with fingers directly.

OTerminal guide of lCs, transistors and diodes

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FMW1T98 28D1328RSTTX

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Anode XCa a Anode /
A A A

21-