NO
START
A
YES
Does the LED on the button of the
Door Station light in standby mode?
(Is the voltage between terminals of
the Door Station about 4~5V?)
NO
Is the wiring correct
between the Main Monitor Station and
the Door Station?
Check Calling Operation. (*1)
(Door Station)
Rewire the Main Monitor
Station and the Door
Station correctly.
YES
Replace the Main board.
YES
B
Check Talk Signal path of Door Station
(Transmitting /Receiving)(*2)
Replace the Main board.
Replace the faulty parts.
NO
Are there any faulty parts found?
Reference:
(*1) Refer to Calling Operation (During Standby) in [9.3 Signal Route].
(*2) Refer to Talk Signal in [9.3 Signal Route].
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