71
In the event of a fault, connect a pair of telephones
to terminals 1, 2, 3, 4 and to two push-buttons on the
entrance panel. This will enable you to check whether
the problem is located in one of the entrance panels,
at the connections to the telephones, or at the entran-
ce panels that make up the multiple access system.
Nothing works.
Check the mains voltage at 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 correct, 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 depre-ssed. 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 audio unit.
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 panel and the lighting push-bu-tton
pilot.Check connections 17 and 18 between the
various entrance panels hooking up the system. 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 detec-
ted, there may be something wrong with the tele-
phone.
One of the entrance panels cannot be heard
from any of the telephones.
Check connections 2 and 4 between the audio unit
and all the telephones. Check the telephone volu-
me control (on the entrance panel) and the lighting
push button pilot. 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 detec-
ted, there may be something wrong with the tele-
phone.
A whistling is heard from the entrance
panel. There is feedback.
Reduce the sound level using the volume controls
on the audio unit.
The call tone cannot be heard at any of the
telephones.
Check that the voltage between 2 and 7 on the
audio unit is 9 V
DC
without depressing the push
button. Check the connection between terminal 7
on the audio unit and the push buttons. Check the
connection between terminal 2 on the audio unit
and the telephones. If no fault is detected, there
may be something wrong with the audio unit.
INSTALLATIONS WITH SEVERAL ENTRANCES OR
COMPLEXES WITH SEVERAL BLOCKS.
MICROPROCESSOR-BASED 4+N SYSTEM
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