Technics SECH 730 Service Manual

Page 1

ORDER NO AD9507173C8

Service Manual

. . Amplifier
Amplifier S E
SB-CH730 or *ZSB-CHSSOA *ISB-CHno or *ESB-CHSSOA - C l l i 3 0
Colour
(K) : Black
SB-S730 $55730
Areas
Suffix 0' Area Colour
Model No.
RS-CH730 SE-CH730 Remote Control
Transmitter (E) Europe
Note: The design of SB-CH530A is differ from the above picture. (EB) Britain
(Kl
(EG) Germany and itaiy
Because of unique interconnecting cables, when a component _ _ .
requires service, send or bring in the entire system. As'a- Lal'" Ameicas
lGCl Middle East, Africa and
Oceania
Specifications System: SC-CH730
Power output SURROUND 4 S2 - 8 £2
DIN1 kHz, THD 1%, both channel driven 2x 50 W (6 E!) CENTER 8 S2
RMS 1 kHz, THD 10%, both channel driven S/N (rated power)
[For (E), (EB) and (EG) areas] 2x 70 W (6 9) MAIN 90 dB
[For (GC) area] 2 x 65 W (6 9)
PRO LOGIC mode I Generai
DIN 1 kHz, THD 1 % Power consumption 213 W

MAIN (both channels driven) 2 X 40 W (6 9) Power SUPPIY
SURROUND 40 W (4 $2 + 4 9) [For (E) and (EG) areas] 230 V, AC 50/60 Hz
CENTER 40 W(8 9) [For (EB) area] 230 - 240 V, AC 50/60 Hz
HMS 1 kHz, THD 10 % [For (60) area] 110/1 27/2201230-240 V, AC 50/60 Hz
MAIN (both channels driven) 2x 50 w (6 9) Dimensions (W>< H X D) 270 X 1185 ><3415 mm
suneouno 50 w (4 o + 4 o) Weight 4.3 kg
CENTER 50 W(8 $2)
Total harmonic distortion NOtESI
Rated power at 1 kHz 1% (6 5;) Specifications are subject to change without notice.
Half power at 1 kHz 009% (6 9) Weight and dimensions are approximate.
Load impedance Total harmonic distortion is measured by the digital spectrum
MAIN e o - a o analyzer.
Area System Tuner/sound processor Compact disc player Amplifier Cassette deck Rigggzfigffl ism:
(E) (EB) (EG) *SB-CH73O SB-S730
SC-CHIBO ST»CH73O SL-CH530 SE-CH730 RS~CH730 .
(GC) SECHSSOA -
* For (E) (EB) and (EG) areas ...... Made in PAES
*2 For (60) area Made in NABEL
AWAHNING
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®

© 1995 Matsushila Electric industrial Co, Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

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SE-CH730 l
I Contents

Before Repair ......
Protection Circuitry.
Accessories ....................
Caution of AC Mains Lead
Location of Controls ......
Stacking the Components
Connections ...............
Optional Antenna Connections
External Unit Connection
Using the Dolby Pro-Logic Surround.
Adjusting Speaker Output Level

I Before Repair

U
m
u:
m

"3 .
I

AOmxIm-ommmmm

» Page
Adjusting the Delay Time ............................................................. 12. 11
Operation Check and
Main Component Replacement Procedures 13 ~ 15

Power Source ON/OFF of This Unit 15
Schematic Diagram ............. 16 ~ 19
Printed Circuit Board Diagram. 20 ~ 23
Wiring Connection Diagram 23
Block Diagram .......... 24

Replacement Parts Lis
Cabinet Parts Location
Packaging ................

(1) Turn off the power supply. Using a 10 Q, 10 W resistor, connect both ends of power supply capacitors (C701. C702) in order to discharge the voltage.
(2) Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltageycontroller to make
sure that the consumed current at 50/60 Hz in NO SIGNAL mode should be shown below with respect to supply voltage 230 V/240 V.

Area (E) (EG) (ES) (GC)
Power supply voltage AC 230 V AC 240 V AC 110 V AC 240 V
Consumed current 50 Hz 60 ~ 200 mA 60 ~ 420 mA 180 - 200 mA 60 ~ 200 mA

l Protection Circuitry

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

>2< No sound is heard when the power is switched ON.
>:< Sound stops during a performance.

The functions 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 ON again.

I Accessories
0 AC power supply cord
(E). (EG) and (GC) areas : (RJA0019-2K)
(EB) area: (VJAO733) ........................

0 Flat cable
Long (REX0661) ..

V .

(E), (EG) and (so)

Medium (REXOGBO) .
Short [REX0608) .....

.................................. 1

0 Remote control transmitter
1 (E), (EB) and (EG) areas: (RAK-CH740WH) 1
1 (GC) area : (RAK-CH741WH)

@

0 Batteries 0AM (LW/MW) loop antenna OAntenna holder
(UM-4. AAA" R03) ................................... 2 (RSA0012) ................................................ 1 (RMN0244) ..................................... 1
Note: These are available on sales route. m
0 Mounting screw 0 FM indoor antenna 0 Speaker cords
(XTN3+12Ar-2) ......................................... 1 (E). (EB) and [EG) areas : (RSAOOO7) ...... 1 (REE0393) ................................................. 2
(GC) area : (RSAOOOS).. ............................. 1
if

(E). (EB) and (EG)

0 Surround speaker cords 0 Attachment plug

(E), (EB) and (EG) areas: (RFA0624-K)

2 for (EB) area only (SJPQOOQ)....

%

(GC)

0 Power plug adaptor
1 for (GO) area only (SJP5213»2) .