Before Repair And Adjustment; Caution For Fuse Replacement; Protection Circuitry; Safety Part Information - Panasonic SC-HC30EF Service Manual

1.2.

Before Repair and Adjustment

Disconnect AC power, discharge unit AC Capacitors as such C5700, C5701, C5702, C5706, C5708 and C5709 through a 10W, 1W
resistor to ground.
Caution : DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
• Current consumption at AC 230V, at 50Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~200 mA.
1.3.

Caution For Fuse Replacement

1.4.

Protection Circuitry

The protection circuitry may have operated if either of the following conditions are noticed:
• No sound is heard when the power is turned 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 the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
1.5.

Safety Part Information

Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by
critical parts should be replaced with manufacturer's specified parts to prevent shock, fire or other hazards. Do not modify the
original design without permission of manufacturer.
Safety
in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
Ref. No. Part No.
55 RGPX1011-K
20 RGNX1043H-K
401 RAE0165T-V
A2 K2CQ2CA00007
A3 RQTX1068-D
A3 RQTX1069-H
T1000 G4D1A0000117
T5701 ETS28BH186AC
T5751 ETS19AB221AG
P5701 K2AA2B000011
C5700 F1BAF1020020
C5701 ECQU2A334MLA
C5702 ECQU2A104MLC
C5706 F1BAF1020020
C5708 F1BAF1020020
C5709 F1BAF1020020
C5713 ECQE6103KF
L5701 G0B453G00003
F1 K5D162BK0005
RY5701 K6B1AEA00003
PC5720 B3PBA0000402
DZ5701 ERZVA5Z471
FP1000 K5H7512A0010
TH5701 D4CC11040013
TH5702 D4CAC8R00002
PCB7 REPX0820EA
Table 1
Part Name & Description
REAR CABINET
TRAVERSE UNIT ASS'Y
TRAVERSE UNIT ASS'Y
AC CORD
O/I BOOK (Ge/It/Fr/Sp/Du/Da/Sw)
O/I BOOK (Fr)
SWITCHING TRANSFORMER
SWITCHING TRANSFORMER
SWITCHING TRANSFORMER
AC INLET
1000pF
0.33uF
0.1uF
1000pF
1000pF
1000pF
0.01uF
LINE FILTER
FUSE
RELAY
PHOTO COUPLER
ZNR
PROTECTOR
THERMISTOR
THERMISTOR
SMPS P.C.B.
4
Remarks
EG-K/S/P
EF-K/S
(RTL)