Protection Circuitry - Panasonic SA-VK680PU Service Manual

1.3.1. 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 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.
4 REZX0023-1
5 REZX0024-1
15 RGRX0070M-F1
53 REXX0686-1
54 REXX0687-1
69 RKMX0144A-K
340 RD-DDTX004-V
A2 K2CQ2CA00007
A3 RQTX0311-M
PCB13 REPX0751H
PCB14 REPX0751H
PCB16 REPX0751H
DZ5701 ERZV10V511CS
L5703 ELF22V035B
T2900 G4D1A0000117
T5701 ETS42BN1A6AD
T5751 ETS19AB256AG
PC5701 B3PBA0000402
PC5702 B3PBA0000402
PC5720 B3PBA0000402
PC5799 B3PBA0000402
F1 K5D802BNA005
FP2901 K5G401A00008
TH5702 D4CAA2R20001
TH5860 D4CC11040013
P5701 K2AA2B000017
C5700 F1BAF1020020
C5701 F0CAF334A087
C5703 F0C2H1040001
C5704 F1BAF1020020
C5705 F1BAF1020020
C5706 F1BAF1020020
C5707 F1BAF1020020
Part Name & Description
BLK WIRE (AC INLET-SMPS)
RED WIRE (AC INLET-SMPS)
REAR PANEL
WHITE WIRE (VOLT SELECTOR SMPS)
BLUE WIRE (VOLT SELECTOR SMPS)
TOP CABINET
TRAVERSE UNIT
AC CORD
O/I BOOK (Sp)
SMPS P.C.B
AC INLET P.C.B
VOLTAGE SELECTOR P.C.B
ZENER
LINE FILTER
SWITCHING TRANSFORMER
MAIN TRANSFORMER
BACKUP TRANSFORMER
PHOTO COUPLER
PHOTO COUPLER
PHOTO COUPLER
PHOTO COUPLER
FUSE
FUSE PROTECTOR
THERMISTOR
THERMISTOR
AC INLET
1000pF
0.33uF
0.1uF 500V
1000pF
1000pF
1000pF
1000pF
5
Remarks
(RTL)
(RTL)
(RTL)
(RTL)