Before Repair And Adjustment; Protection Circuitry; Safety Part Information - Panasonic SB-WA500PP Service Manual

1.2.

Before Repair and Adjustment

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 120 V, at 60 Hz in NO SIGNAL mode, at volume minimum, SEL: DVD, no link, take before 10s
should be ~200 mA.
1.3.

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.
1.4.

Safety Part Information

Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by
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
68
80
PCB1
PCB2
PCB5
P5701
L1001
in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts should
Ref. No. Part No.
RGNX1154-K
N0AB6GY00007
REPX0771C
REPX0770C
REPX0865DA
K2ABYA000001
G0B340J00002
Part Name & Description
SPEC LABEL
SMPS MODULE P.C.B.
RX MODULE P.C.B.
TX MODULE P.C.B.
AC INLET P.C.B.
AC INLET
LINE FILTER
4
Remarks
(RTL)