Technics SACH 950 Service Manual

Page 1

ORDER NO AD921 138008

ervice Manual

Tuner Amplifier
SB-CH950

SH-CH950

SL-CH950

Remote Control ,
Transmitter

RS-CH950 SA-CH950

SB-CH950

Because of unique interconnectingcables,
when a component requires service, send

or bring in the entire system.

SPECIFICATIONS
(DIN 45 500)
l Main Amp. Section

Power output
DIN 1 kHz THD 1%,

both channel driven 2 X 60 W (60)
SFP, Dolby Pro-Logic mode 1 kHz THD 1%
MAIN 2X55 W (60)
SURROUND 2X7 W (80)
Total harmonic distortion
Rated power at 1 kHz 1% (60)

Half power at 1 kHz
Load impedance

0.07% (60)

MAIN 6-80
SURROUND 80
SIN (rated power) 84 dB
Frequency response 40 Hz-ao kHz (-3 dB)

l FM Tuner Section

Frequency range 87.50 MHz-108.00 MHz (0.05 MHz steps)
Sensitivity 1.8 uV (iHF, usable)
sm 26 dB 1.5 uv (750)
SIN
MONO 70 dB (75 dB. IHF)
Stereo separation at 1 kHz 35 dB
Antenna terminal(s) 750 (unbalanced)

I AM Tuner Section
Frequency range
MW
For (E), (EB), (EG), (GIN) areas 522-1611 kHz (9 kHz steps)
530-1620 kHz (10 kHz steps)

Tuner Amplifier
S A- C H 9 5 0
\
Colour
(K) . i 1 Black Type
Areas
Suffix for
Model No. IArea Colour
(E) Europe
(EB) Great Britain
(EG) Germany and Italy (K)
Asia, Latin America,
(GC) Middle Near East and
Africa
(GN) Oceania

System: SC-CH950

LW
For (E), (EB), (EG), (GN) areas 144-288 kHz, (9 kHz steps)

For (GO) area 153-279 kHz (9 kHz steps)
Sensitivity (SIN 20 dB)

MW 500 uV/m

LW 50 IN

I Timer Section .
Clock Quartz-lock type

Function 24-hour programmable; Play timer (1 time)

Rec timer (1 time)

Sleep (120 min. 1 min. intervals)

Setting 1 minute-23 hours 59 minutes (1 min. intervals)
I General

Power consumption 190 W

Power supply
For (E), (E6) areas
For (EB), (GN) areas

AC 50/60 Hz, 230 V
AC 50/60 HZ, 230 V-240 V

For (GO) area AC 50/60 Hz, 1 10/127l220/240 V
Dimension (WxHxD) 270x119><334 mm
Weight 6.1 kg
Notes:

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

For (GO) area 531 -1602 kHz (9 kHz steps) 3. Total harmonic distortion is measured by the digital spectrum
530-1600 kHz (10 kHz steps) analyzer.
System Sound processor Tuner amplifier Compact disc player Cassette deck Speakers
SC-CH950 SH-CHSSO SA

Technics

'(E), (EB), (EG) areas...Made in PAES

Page 2

SAjCl-ISSO |
I CONTENTS

OBEFORE REPAIR ..... , ............
OPROTECTION CIRCUITRY

OSCHEMATIC DIAGRAM ................
OPRINTED CIRCUIT BOARD DIAGRAM

oACCESSORIES ............ oWlRING CONNECTION DIAGRAM 30
OLOCATION OF CONTROLS . . OFUNCTION OF IC TERMINALS . . . 31
oSTACKING THE COMPONENTS OBLOCK DIAGRAM . . . 32~34
OCONNECTIONS ............ OREPLACEMENT PAR S S 35~40
ISETTING THETIME OF DAY .. ICABINET PARTS LOCATION. . 41
IDISASSEMBLY INSTRUCTIONS . . OPACKAGING ................ 42

I BEFORE REPAIR

(1) Turn off the power supply. Using a 10!), 10 W resistor, connect both ends of power supply capacitors (07.01, 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 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 VI127 VI

220 V/240 V.
Power supply voltage AC 230 V AC 240 V
Consumed current 50 Hz 130~230 mA 115~215 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 functions of this circuitry is to prevent circuitry damage it, 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

Check the packing carton for these accessories.

(RJA0019-2K) for (E), (E6), (60) areas
(VJAO753) for (EB) area

OSurround speaker cords .............................. 2 pcs.
(RJL1 P001825)

(RAK-SC707WH)
ORernote control batteries
OFtsmote control transmitter ......................... 1 pc. UM-4, AAA, R03 ................................. 2 pcs.
Note: These are available on sale route.

(REXO462) (SMA233-1 M)

OFIat cable ....................................... 1 pc. CAntenna holder ................................... 1 pc.