Panasonic GP6DU, Technical Manual

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“High” via pin 6 of connector P700/PC700 to the base of Q501 on the P-Board. Q501
turns on providing a current return path for the coil of RL403. RL403 turns on and
applies AC to the rectifier D401.
The 5V source is routed through the D, the C5, and the C4 boards to power the Remote
Control Receiver on the V1 board.
The power supply for the SC-Board is controlled by the same control lines as the power
supply for the SS –Board, via the connector PC701/P700. This allows both Power
supplies to run in tandem.
Power-On with Remote Control
The signal from the remote control is picked-up by the remote control receiver on the V1
board and routed through the C4 and C5 boards before it is applied to connector D33
on the D board. On the D board, the signal is applied to a DC level shifter circuit
(Q9015 and Q9016) to change the logic level of the data to 3.3V. The signal is then
applied to pin 102 of IC9003. Pressing the on/off button on the remote transmitter
causes IC9003 to toggle its output on pin 20 between “High” and “Low”. As discussed
above, pin 20 controls current return path of the coil of the relay RL403.
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