Before Repair And Adjustment; Protection Circuitry; Safety Part Information - Panasonic SH-FX71 Service Manual

1.2.

Before Repair and Adjustment

This model uses switching mode power supply (SMPS) module to provide the necessary voltages for the Digital Receiver
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 110 V to 240 V, at 50/60 Hz in NO SIGNAL mode (at volume minimum) should be ~200 mA. (GC
only)
• Current consumption at AC 220 V to 240 V, at 50 Hz in NO SIGNAL mode (at volume minimum) should be ~200 mA. (GN only)
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
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 Ref. No.
11
11
18
A1
A1
A1
A1
A2
A2
A5
A5
A7
PCB1
in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
Part No.
RGNX1088-K NAME PLATE STICKER
RGNX1086-K NAME PLATE STICKER
N0AE3GJ00001 SMPS MODULE P.C.B.
K2CJ2DA00010 AC CORD
K2CP2CA00001 AC CORD /W TAG
K2CQ2CA00007 AC CORD (2PIN)
K2CZ3YY00005 AC CORD (3PIN)
RQTX1132-G O/I BOOK (Sp,Cn,Ru,Ur)
RQTX1140-B O/I BOOK (En)
RFAX1012D TRANSMITTER UNIT
RFAX1012E TRANSMITTER UNIT
J0KG00000037 FERRITE CORE
REPX0771B DIGITAL RECEIVER MODULE (RX) P.C.B.
Table 1
Part Name & Description
3
Remarks
GN
GC
GN
GC
GC
GC
GC
GC
GN