Panasonic SA-PM42EP, Service Manual

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1.2. Before Repair and Adjustment
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 220-240V, at 50Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~150 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 in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
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.
Table 1
Safety Ref. No. Part No. Part Name & Description Remarks
L5901 ELF15N035AN LINE FILTER
T5901 G4CYBYY00022 TRANSFORMER
T5902 G4C2AAJ00005 BACK UP TRANSFORMER
Z5901 ERZVA5Z471 ZENER
RL5901 K6B1AEA00003 POWER RELAY
F5901 K5D102BLA013 FUSE
FP5901 K5G502AA0002 FUSE PROTECTOR
JK5901 K2AA2B000011 AC INLET
R260 ERD2FCVG470T 47 1/4W
R5905 ERD2FCVG120T 12 1/4W
PCB2 REPX0849HA TRANSFORMER P.C.B. (RTL)
401 RAEX0190Z-V TRAVERSE UNIT
22 RFKHAPM42EGK REAR CABINET ASS’Y EG
22 RFKHAPM42EPK REAR CABINET ASS’Y EP
22 RFKHAPM42EFK REAR CABINET ASS’Y EF
A2 K2CQ2CA00007 AC CORD
A3 RQTX0186-2D O/I BOOK (Ge/It/Fr/Sp) EF
A3 RQTX0187-2H O/I BOOK (Du/Da/Sw) EG
A3 RQTX0188-2E O/I BOOK (Po/Cz/Ar) EP
A3 RQTX0189-2R O/I BOOK (Ru/Ur) EP
A3 RQTX0191-2B O/I BOOK (En) EP