No Communication using serial port (RS-232C)
12
13
Does proper +5V_IN at Pin 16 of IC204?
IC311 defect.
Change main board.
NO
YES
IC311 defect.
Change main board.
NO
YES
Check RS-232C cable.
(Check connection external input
Port of set and PC serial port)
Does the picture ?,? appear at Pin 9, 11 (TX),
10,12 (RX) of IC204 ?
12
13
Trouble Shooting
Trouble Shooting
IC306
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