34
10-806
EN
5. TROUBLESHOOTING
1. Using a multimeter, always first check the voltage between the terminals:
Between terminals …
The following voltage must be
present
b and a
± 24 Vdc
b and P
± 24 Vdc
M and P
± 24 Vdc
b and V1 or V2
± 5 Vdc
2. If the problem with the unit is not solved, then go through the following list of possible
problems:
Problem
Cause
Action
You hear a
negative tone
when
pressing a
bell push
button.
There is an error in the programming. Erase the programming and
start again.
The installation is still in programming
mode.
Exit the programming mode.
The internal unit is not connected
correctly.
Check the wiring according to
the wiring diagram.
The image on
the internal
video unit is
not clear.
The wires on terminals V1 and V2
have been reversed.
Connect the wires correctly to
terminals V1 and V2.
The cable is unsuitable:
•
The cable is too long.
•
The cable is worn.
•
The cable cross-section too small.
•
The cable is not a twisted cable.
Replace the current cable with
a suitable cable.
The terminal resistors on the internal
video unit are not correctly configured.
Position the terminal resistors
correctly on the contacts.
No image
appears on
the internal
video unit.
The other
functions
work properly.
The wiring is not correctly configured:
•
Terminal M or P is not connected.
•
Terminal V1 or V2 is not connected.
Check the wiring according to
the wiring diagram.
The terminal resistors on the internal
video unit are not correctly configured.
Position the terminal resistors
correctly on the contacts.
The speech
function does
not work.
The wiring is not correctly configured. Check the wiring according to
the wiring diagram.