Panasonic BL-PA100A Service Manual page 9

[Over Current Limiter (O.C.L)]
The highest drain current (IC801) is limited by a internal circuit of IC801. The +10.5V output is limited by this circuit.
[Over Voltage Protection Circuit (O.V.P)]
If the +10.5V output increases because the error detecting circuit is broken, The internal circuit of IC801 will recognize this sig-
nal and output becomes 0V.
[Thermal Shutdown Circuit]
IC801 become shutdown when internal temperature becomes 130 degrees C (typ).
[PLC Coupling Circuit]
This circuit superimposes a PLC signal on AC voltage from a MAIN board.
[Async Circuit]
This circuit outputs the rectangle waveform which synchronized with AC frequency.
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BL-PA100A/BL-PA100KTA