Panasonic su ch 7 service manual

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ORDER NO. ADS10408208

Service Manual

Amplifier

Because of unique interconnecting cables,
when a component requires service, send or
bring in the entire system.

I SPECIFICATIONS
(DIN 45 500)

I MAIN AMP. SECTION
Power output DIN 1 kHz THD1% 60 2X25 W
10 kHZTHD 1% BQZXSW
both channel driven at 240 V
Total harmonic distortion

halt power at 1 kHz: Low Amp 0.09% (60)

Headphones output level/impedance 300 mV/3300
I PRE AMP. SECTION
Input sensitivity/impedance
PHONO 3 mV/47 k0
MIC 0.7 mV/lO k0
DAT 250 mV/27 k0
S/N (rated power, 60): Low Amp
PHONO 70 dBUHF. A75 dB)
DAT, co, TAPE 84 dB (IHF. A as dB)

Graphic equalizer control
80 Hz, 250 Hz,1 kHZ, 4 kHz, 12.5 kHz

Amplifier
S U-CH7
Color
(K) .......... Black Type
Areas
000:3? Area Color
(E) Continental Europe.

(EB) Great Britain.

(EG) FR. Germany and Italy.

Asia, Latin America,
(GC) Middle Near East and
Africa,

(GN) Oceania.

System: SC-CH7

I GENERAL
Power consumption 250 W
Power supply
For Great Britain and Oceania AC 50/60 Hz, 230~240 V
For F.R. Germany, Italy and Continental Europe

AC 50/60 Hz, 230 V
For others AC 50/60 Hz, 110 V~127 V/220 V~240 V

Dimensions (WXHXD) 215x110><303 mm
(85/32><41 1/32><1 1 5/1 5)
Weight 4.3 kg (9.3 lb.)
Notes:
1. Total harmonic dislortion is measured by the digital spectrum
analyzer.

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

Muting -20 dB
Super bass 55 H24 +4 dB
Output voltage/impedance
DAT REC OUT 150 mV
System Tuner Amplifier CD Player Cassette Deck Speakers
SC-CH7 ST-CH7L SU-CH7 SL-CH7 RS-CH7 SB-CH7

Technics / Panasonic

(E) (E3) (EG) (GC) (6")

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SU-CH7

I CONTENTS

Page Page
BEFORE REPAIR ..................................... 2 SCHEMATIC DIAGRAM ........................ . , 13~19
PROTECTION CIRCUITRY 2 PRINTED CIRCUIT BOARDS . . . . 20~24
ACCESSORIES ................................ 2 WIRING CONNECTION DIAGRAM . . 25
HOW TO INSTALL THE SYSTEM ...................... 3 FUNCTIONS OF IC TERMINALS . . 26
CONNECTIONS IIIIIIIIIIIIII . 4, 5 BLOCK DIAGRAM ............ 27~29
LOCATION OF CONTROLS ... . . . 6, 7 REPLACEMENT PARTS LIST . . 30~36
DISASSEMBLY INSTRUCTIONS . . . . 8~11 CABINET PARTS LOCATION . 37, 38
DESCRIPTION OF FL PANEL ............................ 12 PACKING (For System: SC-CH7) . 39

I BEFORE REPAIR

(1) Turn off the power supply. Using a 100, 5 W resistor connect both ends of power supply capacitors (C703, C704) 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 Hyeo Hz in NO SIGNAL mode should be shown below with
respect to supply voltage 110 V~127 V/220 V~240 V.

Power supply voltage AC 120 V AC 240 V
Consumed current 50 Hz - 85~255 mA
Consumed current 60 Hz 160~480 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 ON again.

I ACCESSORIES

cAC power supply cords (1 )

OSpeaker cords (2)

OFM indoor antenna (1)

IRemote control transmitter (1)

for (E. EG) area for (E, EB, EG) area for (E, EB, EG) area
for (EB) area for (GO, GN) area
for (60) area for ((30, GN) area
for (GN) area

oRemote control batteries (2)
(UM-4, AAA". R03)

DAttachment plug (1 )
for (EB) area