Before Repair And Adjustment; Protection Circuitry; Safety Parts Information - Panasonic SA-VKX80GA Service Manual

1.4.

Before Repair and Adjustment

Disconnect AC power to discharge unit AC Capacitors as such (C5701, C5703, C5704, C5705, C5706, C5707, C5708) through a
10 Ω, 10 W 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 220~240 V, 50/60 Hz in Power ON, FM Tuner, No Signal, Volume minimal mode should be ~ 500 mA.
Current consumption at AC 110~127 V, 50/60 Hz in Power ON, FM Tuner, No Signal, Volume minimal mode should be ~ 750 mA
(GA/GS).
1.5.

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.
1.6.

Safety Parts Information

Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by
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.
in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts
Safety Ref No. Part No.
6 REXX1030
7 REXX1031
17 RGRX1003E-A1 REAR PANEL
17 RGRX1003F-A1 REAR PANEL
17 RGRX1003F-B
39 RKMX1007-K
40 RKMX1008-K
58 RMQX1087
401 RAEX1032Z-V
A2 K2CP2CA00001 AC CORD /W TAG
A2 K2CQ2CA00007 AC CORD
A3 K2CZ3YY00005 AC CORD
A3 RQTX1220-G
A3 RQTX1221-L
PCB11 REPX0809P
PCB11 REPX0809N
PCB12 REPX0809N
DZ5701 ERZV10V511CS ZNR
S5701 K0ABCA000007 SW VOLT ADJ
L5702 ELF22V020A
L5703 G0B103H00012 LINE FILTER
L5703 G0B932H00002 LINE FILTER
T4300 G4DYA0000214 TRANSFORMER
T5701 G4DYZ0000049 MAIN TRANSFORMER
T5751 ETS19AB2E6AG SUB TRANSFORMER
PC5701 B3PBA0000402 PHOTO COUPLER
PC5702 B3PBA0000402 PHOTO COUPLER
PC5720 B3PBA0000402 PHOTO COUPLER
PC5799 B3PBA0000402 PHOTO COUPLER
F1 K5D502BNA005 FUSE
F1 K5D802BNA005 FUSE
TH5702 D4CAA2R20001 THERMISTOR
TH5860 D4CC11040013 THERMISTOR
Part Name & Description
1P BLACK WIRE (VOLTAGE-SMPS)
1P RED WIRE (VOLTAGE-SMPS)
REAR PANEL
SIDE PANEL L
SIDE PANEL R
DECK COVER SHEET
TRAVERSE UNIT
O/I BOOK (En)
O/I BOOK (En/Pe/Ar)
SMPS P.C.B.
SMPS P.C.B.
VOLTAGE SELECTOR P.C.B.
LINE FILTER
5
Remarks
GA/GS
GA/GS
GC
GS
GA
GA
GA/GC
GS
GC/GS
GA
(RTL) GC
(RTL) GA/GS
(RTL) GA/GS
GA/GS
GC
GC
GA/GS
GC
GA/GS