Panasonic VL-SV75 Series Service Manual page 22

A
START
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?)
YES
Check Calling Operation. (*1)
(Door Station)
B
Reference:
(*1) Refer to Calling Operation (During Standby) in
(*2) Refer to Talk Signal in
NO
Check Talk Signal path of Door Station
(Transmitting /Receiving)(*2)
Are there any faulty parts found?
Replace the Main board.
[9.3 Signal
[9.3 Signal Route].
Is the wiring correct
between the Main Monitor Station and
the Door Station?
YES
Replace the Main board.
YES
NO
Route].
- 22 -
NO
Rewire the Main Monitor
Station and the Door
Station correctly.
Replace the faulty parts.