Technics SUCH 7002 Service Manual

Page 1

. Service

Power Amplifier

F SB-CH700

SH-CH700
SL-CH700

ORDER NO. AD920202208

Manual

Amplifier

SU-CH7OO

se-CH7oo

/ Colour
(K) . . . . Black Type
.1
Areas
6:33: If; Area Colour
; .
(E) Continental Europe.
SU-CH700
<- Remote Control Transmitter (EB) Great Britain.
. > (EG) Germany and ltaly. (K)
Because of unique interconnecting cables, . , y
when a component requires service, send or (6C) Qféiltfigafgg'fid
bring In the entire system. Africa.
I SPECIFICATIONS 6) em
I POWER AMPLIFIER SECTION SVSW" SC'CH700
Power output -
. Front+Surround: DIN 1 kHz THD 1% 60, 2x40 W
Total Harmonic distortion
Half power at 1 kHz: 0.09% (60)
Impedance
Front: SQ
Surround: 80
I PRE AMPLIFIER SECTION
input sensitivity/Impedance
Front: 200 mV/47 kn
Mic: 0.7 mV/12 k0
. Loudness: 5 dB (60 Hz)/ior volume position ~30 dB
I GENERAL
Power consumption: 250 W (SYSTEM)
Power supply
. For Great Britain and Oceania: AC 50/60 Hz, 230~240 V
For Germany, Italy and
,7 Continental Europe: AC 50/60 Hz, 230 V >
For others: AC 50/60 Hz, 1 10 V/127 V/220 V1240 V
Dimensions (WXHXD): 215x110x346 mm
Weight: 5.1 kg
l
Notes:
1. Specifications are subject to change without notice.
2. Weight and dimensions shown are approximate.
3. Total harmonic distortion is measured by the digital spectrum analyzer.
System Tuner/CD player Sound Processor Power Amplifier Cassette Deck Speakers
SC-CH7DD SL-CH700 SH-C H700 SU~CH700 RS-CH7OO *SB-CH700

Technics

'(E), (E5), (E6) areas...Made in PAES

Page 2

SU-CH700

I CONTENTS

BEFORE REPAIR
PROTECTION CIRCUITRY
ACCESSORIES
LOCATION OF CONTROL .
CONNECTIONS ..........
DISASSEMBLY INSTRUCTION
SCHEMATIC DIAGRAM
(Operation/FLIHeadphones circuit) ..................... 5~10
SCHEMATIC DIAGRAM
(lnput-Output/Main circuit) ............

I BEFORE REPAIR

PRINTED CIRCUIT BOARDS

WIRING CONNECTION DIAGRAM

DESCRIPTION OF FL PANEL
BLOCK DIAGRAM

FUNCTION OF [C TERMINALS

REPLACEMENT PARTS LIST
CABINET PARTS LOCATION
PACKAGING ...............

..... 24~27, so

(1) Turn off the power supply. Using a 1 on, 10 W resistor, connect both ends of power supply capacitors (C703, C704) 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/120 V/

220 V/240 V.
Power supply voltage AC 1 10 V AC 120 V AC 220 V AC 230 V AC 240 V
Consumed current 50 Hz 279~518 mA 264N491 mA 142~265 mA 152~283 mA 133~248 mA
Consumed current 60 Hz 229~426 mA 222~413 mA 120~223 mA 125~232 mA 1 12-208 mA

I PROTECTION CIRCUITRY

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

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

The function of 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, follow 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 ACCESSORIES

Attachment plug .......... 1 pc.

for (EB) area

Flat cable 1 pc. AM loop antenna. . . . . 1 pc.

Optical cable ......... '. . . 1 pc. AC Power supply cord . . . , 1 pc.
for (E) (EG) area
for (EB) area
for (GO) area
' for (GN) area

Speaker cord ............ 2 post

TV/FM indoor antenna. 1 pc.
for (GO) (GN) area
for (E) (EB) (EG) area

transmitter

Remote control
.............. 1 pc.

Antenna holder ..... 1 pc,

Screws ................ 2 pcs.

(5:9
W

Remote control batteries . .

2 pcs.

ACplug adaptor . . . 1pc.
for (GO) area