104
TROUBLE SHOOTING
7
Check the connections of the different elements. To do
so, check that the voltages on the different terminals coin-
cide with those indicated in Section 2 "Technical
Information".
Nothing works.
Check the mains voltage in the power supply unit that
feeds the audio unit. Check that the voltage between
and V of the power supply is 12 Vac. Check for the
existence of a short circuit and rectify this. Disconnect the
power supply for 1 minute and then reconnect it. If the
breakdown continues, disconnect all the power supply
V and terminals, and check that the voltage between
and V is 12 Vac. If this is not the case then there
may be something wrong with the power supply.
The card holders do not light up.
Check that the voltage between and V of the power
supply that feeds the audio unit is 12 Vac. Check that the
voltage between 9 and 10 in the audio unit, with the
lighting push button activated, is 12 Vac. Check whether
the lamp is burnt out.
The lighting push button pilot does not light up.
Check that the voltage between and V in the audio
unit is 12 Vac. If the voltage is correct, there may be
something wrong with the audio unit.
No monitor can be heard from the entrance panel.
Check connections 2 and 3 from the audio unit to all
the monitors. Check the volume control on the panel and
the lighting push button pilot. If you cannot find the fault,
there may be something wrong with the audio unit.
One monitor cannot be heard from the
entrance panel.
Check connections 2 and 3 from the connection brac-
ket to the audio unit. If you cannot find the fault, there
may be something wrong with the monitor.
You cannot hear an entrance panel on any moni-
tor.
Check connections 2 and 4 from the audio unit to all
the monitors. Check the volume control on the monitors
The following situations may help you to solve problems
you may find:
(on the panel) and the lighting push button pilot. If you can-
not find the fault, there may be something wrong with the
audio unit.
You cannot hear the entrance panel on a moni-
tor.
Check connections 2 and 4 from the connection bracket
to the audio unit. If you cannot find the fault, there may be
something wrong with the monitor.
You can hear whistling in the panel. The sound
produces feedback.
Lower the sound level using the volume control on the
audio unit.
The call tone doesn’t ring on any monitor.
Check that the voltage between 2 and 7 in the audio
unit, without pressing the push button, is 9 Vdc. Check the
connection between 7 in the audio unit and the push-but-
tons. Check connection 2 from the audio unit to the moni-
tors. If you cannot find the fault, there may be something
wrong with the audio unit.
The call tone doesn’t ring in a monitor.
Check that the handset is not off the hook. Check the
connection between the connection bracket and the moni-
tor. Check connections 2 and 5 from the conection bracket
to the entrance panel. Check the push-button connection
on the audio unit. If you cannot find the fault, there may be
something wrong with monitor or the panel push-button.
You cannot hear the call confirmation on the
entrance panel.
Check that you can hear the monitors on the entrance
panel. Check that the call tone rings on the monitors. If you
cannot find the fault, there may be something wrong with
the audio unit.
The electric lock doesn’t work.
Check that the voltage between 1 and 2 in the audio
unit, without pressing the lock release button, is 5 Vdc.
STANDARD INSTALLATIONS. 6+N+COAXIAL SYSTEM
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