Technics SECH 555 Service Manual

Page 1

Service

. Compact Disc Changer

COMPACT *
[fillies MASH

DIGITAL AUDIO
sa-cusssmsa-cuass)

SL-CH555 SH-CHGSO

RS-CHSSD

Remote Control
Transmitter

SA-CH655

Note:

SB-CHGSSD (SB-CH655)

ORDER NO. ADQSO307606

Manual

Compact Disc Player
SL-CH555
Colour
(K) ........ BlackType
Area
5:3: :3); Area Colour

Europe, Asia, Latin
America, Middle Near
East, Africa and
Oceania

(E) (K)

System: SC-CH655

On the above picture. Model No. SB-CH655D is printed as the system speaker.
The surround speakers are not supplied with model No. SB-CHGSS.

Because of unique interconnecting cables, when a component requires service, send or

77 bring in the entire system.

v
SL-CH550 TRAVERSE DECK SERIES (RAE0111Z)
SPECIFICATIONS (DIN 45 500)
I AUDIO Notes:
DA converter 1 bit 2 DAC MASH 1. Specifications are subject to change without notice.

as, Weight and dimensions are approximate.

- I PICKUP *

'- Wavelength 730 nm
Laser power No hazardous radiation l5 emitted ITechnics (or Panasonic) developed the worlds first MASH

(h safety Pmecm) type DAC and A00 MASH technology was invented by
NTT (LSI Labs).
w, I GENERAL OMASH is a trademark of MT.
Dimensions (WXHXD) 270x89,5x315 mm
Weight 2.9 kg
1
. . Compact Disc
7 System Sound Processor Tuner Amplifier Changer Cassette Deck Speakers
SB-CH655.. .Europe (Made in PAES)
SC-CHGSS SH-CH65O SA~CH655 SL-CH555 RS-CH550 SB-CH655D.. Asia, Latin America, Middle
Near East, Africa and
Oceania

Technics

Page 2

SL-CH555

I CONTENTS

Page
IHANDLING PRECAUTIONS FOR TRAVERSE DECK ...... 2
OPRECAUTION OF LASER DIODE ................... . . . 2, 3
CLOCATION 0F CONTROLS ..... . . . 3, 4
IDISASSEMBLY INSTRUCTIONS ...................... 5~13
OHOWTO CHECK THE SERVO AND MAIN P.C.B. ,.. .. . .. 14,15
ONEW DIGITAL SERVO CIRCUIT ......... .. .. . 15
ISCHEMATIC DIAGRAM ............. 16~22
OPRINTED CIRCUIT BOARD DIAGRAM ................ 23~25

'UWIRING CONNECTION DIAGRAM ...................... 26
OTROUBLESHOOTING GUIDE ........................ 27, 28

Page
IMEASUREMENTS AND ADJUSTMENTS .............. 29, 30
ODISPLAY FUNCTION OFAUTOMATICALLY-ADJUSTED
RESULTS .. .. 31
ONEW DIGITAL SERVO CIRCUIT . . . . . 32
'FUNCTION OF IC TERMINALS . . . 33~36
OBLOCK DIAGRAM ............. . . 37~40
CREPLACEMENT PARTS LIST . 41 ~43, 47
OCABINET PARTS LOCATION ........... 44, 45
'LOADING UNIT PARTS LOCATION ...................... 46

I HANDLING PRECAUTIONS FOR TRAVERSE DECK

The laser diode in the traverse deck (optical pickup) may break down due to potential dillerence caused by static electricity oi clothes or

human body.

So, be carelul oi electrostatic breakdown during repair at the traverse deck (optical pickup).

OHandling 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. To prevent the breakdown ot the laser diode, an anti-static
shorting pin is inserted into the tlexible board (FPC board).
When removing or connecting the short pin, linish the Job in as
short time as possible.

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

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

OGroundlng for 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 conductive material (sheet) or steel sheet on the area where
the traversedeck (optical pickup) is placed, and ground the sheet.

Caution:

The static electricity at your clothes will not be grounded through the

wrist strap. So, take care not to let your clothes touch the traverse

deck (optical pickup).

I PRECAUTION OF LASER DIODE

CAUTION: This product utilizes a laser diode with the unit turned an". invisible laser radiation is emitted from the pick up lens.

Wavelength: 780 nm

Maximum output radiation power from pick up: 100 pWNDE

Variable resistor
(Do not turn)

FPC

Be sure to short this portion
(Use the shorting pin or clip)

1M0

Iron plate or some metals
to conduct electricity

Laser radiation from the pick up unit is safety level, but be sure the followings:

1 . Do not disassemble the optical pick up unit, since radiation irom 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 tocus lens using optical instruments.
4. Recommend not to look at pick up lens for a long time.

AGHTUNG: Dieses produkt enthalt eine laserdiode. tm eingeschalteten zustand wird unsichtbare Iaserstrahlung von der Iasereinheit abgestrahit.

Weilenlange: 780 nm

Maximaie strahlungsleistung der iaserinhelt: 100 pWNDE

Die strahtung an der iasereinheit ist ungefahrllch, wenn falgende punkte beachtet werden:

1. Die lasereinheit nicht zerlegen, da die strahiung an der freigelegten laserdiode gefahriich ist.
2. Den werksseitig justierten einstellregier der lasereinreit nioht varstellen.
3. Nicht mit optischen instrumenten in die tokussierlinse blicken.

4. Nicht Cuber lingers zeit in die lokussierlinse biicken.

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U