Technics SACH 655 Schematics

Page 1

Service M

Tuner Amplifier

SB-CHGSSD (SB-CHESS)

SL-CHSSS SH-CHGSO

|
SA-CH655

Remote Control RS-CHSSO

Transmitter

Note:

On the above picture, Model No SB-CHSSSD is primed 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
bring in the entire system.

SB-CHGSSD (SB-CH655)

ORDER NO. ADQSOZOSQCB

anual

Tuner Amplifier
Colour
(K) ........ Black Type
Areas
Suffix for '
Model No. Area Colour
(E) Europe
(EB) Great Britain
E G cl I
( G) ermany an Ita y (K)
Asia. Latin America,
(GO) Middle Near East and
Africa
(GN) Oceania

System: SC-CH655

SPECIFICATIONS

(DIN 45 500)

I MAIN AMP. SECTION I AM TUNER SECTION

Power output Frequency range
DIN 1 kHz THD 1%, MW
both channel driven 2x50 W (60) For (E, E3, E6, GN) areas 522-1611 kHz (9 kHz steps)

SPACE MODE 530-1620 kHz (10 kHz steps)
(Only for the system with SB-CHGSSD) For (GO) area 531 -1 602 kHz (9 kHz steps)

MAIN 1 kHz THD 1% 2X45 W (60) 530-1600 kHz (10 kHz steps)
SURROUND 1 kHz THD 1% 2x5 W (80) LW

Total harmonic distortion For (E, EB, EG, GN) areas 1W288 kHz (9 kHz steps)
Rated power at 1 kHz 1% (6(1) For ((36) area 153-279 kHz (9 kHz steps)
Half Power at 1 kHz 0.09% (60) Sensitivity (SIN 20 dB)

Load impedance MW 500 uv/m
MAIN 6-89 LW 50 uV
SURROUND 80

SIN (rated power) 84 dB (lHF, A 88 dB) l TIMER SECTION

Frequency response 40 Hz-aO kHz (-3 dB) Clock Qummock type

Function 24-hour programmable; Play timer (t time)

I FM TUNER SECTION Rec timer (1 time)

Frequency range 8150-10800 MHz (0.05 MHz steps) Sleep (120 min. 1 min intervals)

SENSIIIVIIY 1-8 IJV UHF. usable) Setting 1 minute-23 hours. 59 minutes (1 min. intervals)
SIN 26 dB 15 11V (750)

SIN
MONO 70 dB (75 dB, IHF)

stereo separation at 1 kHz 35 dB

Antenna terminaKs) 750 (unbalanced)

System Sound processor Tuner amplifier Compact disc player Cassette deck Speakers
_ SB-CH655
SO-CHGSS SH-CHGSD SA-CH655 SLCHSSS FIS-CH550 (Made in PAES) ........ (E), (EB), (EG) areas
SB-CH655D ................ (GC), (GN) areas

Technics

Page 2

SA-CH655

I GENERAL
Power consumption

For (E, E3, EG. GN) areas 166 W

For (60) area 175 W
Power supply

For (E, E6) areas AC 50/60 Hz, 230 V

For (EB, GN) areas Ac 50/60 Hz, 230 V-240 V

For (66) area AC 50/50 Hz, 110/127/220/240 V

I CONTENTS

' Page
OBEFOFIE REPAIR ............. 2
'PROTECTION CIRCUITRY . . . 2
.BEFORE USE FOR ((30) AFIEA . 2
OCAUTION FOFI AC MAINS LEAD . 3
OACCESSORIES ............... 4
OSTACKING THE COMPONENTS . . 5
.CONNECTIONS ......... 6N9
OLOCATION OF CONTROLS 10. 11
CSETI'ING THETIME OF DAY . 12
OBASIC OPERATING PROCEDURE . 13

I BEFORE REPAIR

Dimension (WXHXD)
Weight

Notes:

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

2. Total harmonic distortion is measured by the digital spectrum
analyzer.

270x119x332 mm
5.5 kg

ODISASSEMBLY INSTRUCTIONS .. .
oBLOCK DIAGRAM ...............
OWIFIlNG CONNECTION DIAGRAM
OPRINTED CIRCUIT BOARD DIAGRAM.
OSCHEMATIC DIAGRAM .........
OFUNCTION OF IC TERMINALS I
IREPLACEMENT PARTS LIST
oCABINET PARTS LOCATION .
IPACKAGING ...................

(1) Turn off the power supply. Using a 109. 10 W resistor. connect both ends of power supply capacitors (c701. C702) in order to discharge the

voltag e.

(2) Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltage controller to make
sure that the consumed current at 50/60 HZ in NO SIGNAL mode is mode should be shown below with respect to supply voltage 110 V/127 V/

220 V/240 V.
Power supply voltage AC 110~127 V AC 220~240 V AC 230 V AC 240 V
Consumed current 50 Hz 250~350 mA 95~175 mA 100~1 90 mA 95~175 mA

I PROTECTION CIRCUITRY

The protection circuitry may have operated it either of the following conditions is noticed:

'No sound is heard when the power is switched ON.
'Sound stops during a performance.

The functions oi this circuitry is to prevent circuitry damage if, for example. the positive and negative speaker connection wires are "shorted", or if
speaker systems with an impedance less than the indicated rated impedance of this unit are used.

If this occurs, iollow the procedure outlined below:
1. Switch OFF the power,
2. Determine the cause of the problem and correct it.
3. Switch ON the power once again.

Note:

When the protection circuitry functions. the unit will not operate unless the power is first switched OFF and then 0N again.

I BEFORE USE FOR (GC) AREA

Be sure to disconnect the mains cord before adjustingthe voltage
selector.

Use a minus (-) screwdriver to set the voltage selector (on the
bottom of the tuner amplifier) to the voltage setting for the area in
which the unit will be used.

(If the power supply in your area is 117 V or 120 V, set to the
127 V" position.)

Note that this unit wiII be seriously damaged it this setting is not
made correctly. (There is no voltage selector for some countries;
the correct voltage is already set.)

THIS TUNER/RECEIVER IS CAPABLEOF RECEIVING THE NEW AM STEREO BROADCASTS FROM THE AM BAND
RADIO STATIONS. HOWEVER LIKE MANY TUNERS AND RECEIVERS CURRENTLY AVAILABLE ON THE MARKET
IT WILL REPRODUCE THIS AM STEREO SIGNAL ONLY IN AM MONO, WHICH, IN EFFECT, IS OF NO LESSER
QUALITY THAN YOUR EXISTING AM MONO TUNER/RECEIVER.