Technics SLMC 7 Service Manual

Page 1

Service

COMPACT

DIGITAL AUDIO

TRAVERSE DECK
I Specifications

I AUDIO

No. of channels
Frequency response
Output voltage
Dynamic range

SIN

Harmonic distortion
Wow and flutter

DA converter
Output Impedance
Load impedance

COMPACT

DIGITAL AUDIO
TEXT

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

2 V (at 0 d8)

92 dB

100 dB

0.007% (1 kHz, 0 dB)
Below measurable limit
MASH (1 bit)

Approx. 1 k9

More than 10 k9

ORDER NO. MD9905076C2

anual

Compact Disc Changer

MASH

mum-sung noise shaping

SL-MC7

Colour
(K) . . . Black Type

Area

Suliix for

Model No. Area Colour
(E) Europe
(EB) Great Britain (K)
(EG) Germany and Italy

RAE01522-M Mechanism Series

I PICKUP

Wavelength

I General

Power supply

Power consumption
Dimensions (W x H x D)
Weight

Notes :

750 nm

AC 230 - 240 V, 50 Hz
14 W

430 X171 x 392 mm
7.2 kg

Specifications are subject to changes without notice.
Weight and dimensions are approximate.

A WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does
not contain warnings or cautions to advise non-technical 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 with in this service information by anyone else could result in serious injury or death.

Technics®

© 1999 Matsushita Electronics (S) Pte. Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Page 2

SL-MC7

I Contents

- ACCESSORIES ......................................................
0 HANDLE PRECAUTIONS FOR TRAVERSE DECK
' PRECAUTION OF LASER DIODE .
- CAUTION FOR AC MAINS LEAD
- CONTROLS
° CONNECTIONS.
- BASIC OPERATIONS
- DISC GROUPING PLAY
° CD-TEXT FUNCTION
- SELF-DIAGNOSIS FUNCTION
0 OPERATION CHECKS......t......
- TYPE ILLUSTRATION of ICs TRANSISTORS and DIODES 23

I Accessories

PAGE

I TERMINAL FUNCTION OF ICs ......................................... 23 ~ 25
- WIRING CONNECTION DIAGRAM
. BLOCK DIAGRAM ........................
- TROUBLESHOOTING GUIDE

- SCHEMATIC DIAGRAM ........

0 PRINTED CIRCUIT BOARD ......
' CABINET PARTS LOCATIONS .
- LOADING MECHANISM PARTS
0 REPLACEMENT PARTS LIST...
- RESISTORS 8: CAPACITORS ......
- PACKING MATERIALS 8t ACCESSORIES .
0 PACKAGING

AC power cord
for others

AC powercordfor I
United Kingdom only

Remote control

Stereo connection cable

3
33°

0

Notebook-like binder Numbered stickers

Batteries

I Handling Precautions for Traverse Deck

The laser diode in the traverse deck (optical pickup) may break down due to potential diilerence caused by static electricity of clothes or human body.
So, be carelul of electrostatic breakdown during repair of the traverse deck (optical pickup).

- Handling of 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. The short land between the No.4 (LD) and No.5 (GND) pins on the
flexible boards (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 linish the work quickly.

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

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

- Grounding tor electrostatic breakdown prevention
1. Human body grounding
Use the anti-static wrist strap to discharge the static electricity
from your body.
2. Work table grounding
Put a conducive 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).

FFC board
(Handle It carelully)

Lens (Do not touch)

Variable resistor
(Do not turn)

Wrist strap

(Anti-static bracelet) /
1 Iron plate or some metals to
conduct electricity

Page 12

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Page 13

I Self - Diagnostic function

SL-MC7

Mode Procedure Content U89
Turn ON power button with no disc
loaded.
FL Press the following 3 buttons
simultaneously:
PLAY( >).STOP(I ),TRACK SKIP(M , Enables checking oi whether
display FL all ""m I all lit FL and each SW are okay or
not, before set disassembly.
m°d° FL all unlit
Press DISC button
Press specified button
FL all llt
Turn ON power button with no disc Displays detective points while
loaded. performing a series of mecha-
{ nism operations.
Hold down the STOP ( I ) button
Moohe- for at least 2 seconds. 0 F15: PU rest SW etc.
nloal 0 F27: Slide drive system Enables fault to be diagnosed,
"W0 Simultaneously press the TRACK SKIP C F-28/ 0 MS): Loadlno system before set disessembly.
(DH) button ior at least 2 secondswhile ._.._ ._ __ .. _ _._..
holding down the STOP (I ) button. F26: Main to detect (Automatically
l displayed when power Is turn-
ed 0N. regardless of mode
0 setting.)
(Appears on display)
Turn OFF power button once. with no i button: Results in ind endent ,
disc loaded. I operation of "959,59 Use to check correct operation
{I deck. alter disassembly.
Turn ON power while simultaneously
holding down the following button:
1-, PLAY( > ). SToPt I ) button: Repeats loading I
mode unloading operation.
.TEST MODE (Appears on display)
Use to check correct operation
Press. button after repair.
button: Automatically repeats
_ Press button loading / unloading /
slide operation.
Mount disc in single
(slot 0) position.
|---> Press button
gr: gwgrtgghflicorcsel?" turn Displays servo circuit status on FL. Enables checking of servo status.
i * F = Focus servo
Servo . _
;: urn ON power while slmultane- , = .
adjust- ously pressing the following three * ' Tracking servo
ment buttons: :- _
mode * l. - CLV servo

PLAY( >).PAUSE( || ).STOP(I)

Press the PLAY( >) button.

F... 71. L"?

_13_