69
In the event of a fault, connect up just one tele-
phone to terminals 1, 2, 3, 4 and to one push-but-
ton on the entrance panel. This will enable you to
check whether the problem is located at the
entrance panel end or in the connection to the
telephones.
Nothing works.
Check the mains voltage in the power supply.
Check that the voltage between and V~ on
the power supply is 12 V
AC
. Check whether
there is a short circuit, and if so, correct it.
Disconnect the power supply from the mains for
1 minute and reconnect it. If the fault continues,
disconnect all the terminals from and V~ on
the power supply and check that the voltage
between and V~ is 12 V
AC
. If it is not there
may be something wrong with the power
supply.
The card holders don´t light up.
Check that the voltage between and V~ on
the power supply is 12 V
AC
. Check that the
voltage between 9 and 10 on the audio unit is
12 V
AC
, with the lighting push-button depres-
sed. Check whether the bulb is blown.
The lighting push button pilot does not
light up.
Check that the voltage between and V~ on the
audio unit is 12 V
AC
. If the voltage is correct there
may be something wrong with the push button.
None of the telephones can be heard
from the entrance panel.
Check connections 2 and 3 between the audio
unit and all the telephones. Check the volume
control on the entrance panel and the pilot
light for the lighting push button. If no fault is
detected, there may be something wrong with
the audio unit.
One of the telephones cannot be heard from
the entrance panel.
Check connections 2 and 3 between the audio
unit and the telephone in question. If no fault is
detected, there may be something wrong with
the telephone.
The entrance panel cannot be heard from
any of the telephones.
Check connections 2 and 4 between the audio
unit and all the telephones. Check the telephone
volume control (on the entrance panel) and the
pilot light for the lighting push button. If no fault
is detected, there may be something wrong with
the audio unit.
The entrance panel cannot be heard from
one of the telephones.
Check connections 2 and 4 between the audio
unit and the telephone in question. If no fault is
detected, there may be something wrong with
the telephone.
TROUBLESHOOTING
7
Check the connections of the various items. To
do so, check that the voltages on the various ter-
minals are those stated in section 2 “Technical
data”.
To help you locate possible problems, some of
the situations that may arise are described here.
BASIC INSTALLATIONS. 4+N SYSTEM
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