Panasonic SA-PT750PC, Service Manual

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1.2.1. Caution for fuse replacement
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 Parts 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 & 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
Reference No. Part No. Part Name & Description Remarks
PC5701 B3PBA0000402 PHOTO COUPLER [M]
PC5702 B3PBA0000402 PHOTO COUPLER [M]
PC5720 B3PBA0000402 PHOTO COUPLER [M]
PC5799 B3PBA0000402 PHOTO COUPLER [M]
D5701 B0FBAR000041 DIODE [M]
DZ5701 ERZV10V511CS ZENER [M]
TH5701 D4CAA5R10001 THERMISTOR [M]
TH5860 D4CC11040013 THERMISTOR [M]
L2101 J0JBC0000015 CHIP INDUCTOR [M]
L2201 J0JBC0000015 CHIP INDUCTOR [M]
L2802 J0JBC0000015 CHIP INDUCTOR [M]
L2803 J0JBC0000015 CHIP INDUCTOR [M]
L2804 J0JBC0000015 CHIP INDUCTOR [M]
L2805 J0JBC0000015 CHIP INDUCTOR [M]
L5001 G0B9R5K00003 CHOKE COIL [M]
L5002 G0B9R5K00003 CHOKE COIL [M]
L5201 G0B9R5K00003 CHOKE COIL [M]
L5301 G0B9R5K00003 CHOKE COIL [M]
L5500 J0JKB0000020 EMI BEAD CORE [M]
L5501 J0JKB0000020 EMI BEAD CORE [M]
L5702 ELF22V035B COIL [M]
L5721 J0JKB0000020 EMI BEAD CORE [M]
T2900 G4D1A0000117 TRANSFORMER [M]
T5701 ETS42BM15GAD TRANSFORMER [M]
T5751 ETS19AB236AG TRANSFORMER [M]
F1 K5D802APA008 FUSE [M]
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SA-PT750P / SA-PT750PC