105
Check that the voltage between 11 and 12 in the audio
unit, when you press the lock release button, is 12 Vac. If
you cannot find the fault, the lock may be broken.
The video system does not work in any moni-
tor: auto switch-on, screen doesn´t come on
when receiving a call, ...
Check the mains voltage in the power supply unit that
feeds the monitors. Check that the voltage of the power
supply between - and + is 15 Vdc. Check if there's a short
circuit and rectify it. Disconnect the power supplies supply
for 1 minute and reconnect it. If the breakdown continues,
disconnect all the - and + terminals from the power supply
Video system does not work in one monitor:
auto switch-on, screen doesn´t come on when
receiving a call,..
Check that the ON/OFF switch for the video is in ON
position (on the left). Check that the red led of the monitor
is on. Check the connection between the connection brac-
ket and the monitor. Check that the voltage between - and
+ of the connection bracket is 15 Vdc. If failure cannot be
found, there may be something wrong with the monitor.
Poor image quality on all the monitors: distor-
ted picture, ghost images, loss of synchronisa-
tion.
If splitters have been used in the distribution, check that
the voltage between - and + of the splitters is 15 Vdc.
Check that coaxial cable line has a 75 Ohm load: a) if
tap-offs have been connected in series the 75 Ohm resis-
tance must be removed from all the intermediate tap-offs; b)
with monitors in series cut the 75 Ohm resistances on all the
connection brackets, but from the one at the end of the line.
Check coaxial connection in splitters and tap-offs. If you
cannot find the fault, there may be something wrong with
the video unit.
Poor image quality on one monitor: distorted
picture, ghost images, loss of synchronisation.
Check that coaxial cable line is charged with 75 Ohm:
with monitors in series cut the 75 Ohm resistances on all the
connection brackets, but from the one at the end of the line.
If you cannot find the fault there may be something wrong
with the monitor.
Auto switch-on does not work on any monitor.
Check that the entrance panel has been defined as the
main one. Check that the voltage between 1 and 2 of the
audio unit, without pushing the auto switch-on button is
5Vdc. If you cannot find the fault there may be something
wrong with the audio unit.
Auto switch-on does not work on one moni-
tor.
Check that pushing the auto switch-on button the red
led flash. Check that the system is not engaged. If you
cannot find the fault, there may be something wrong
with the connection bracket or the monitor.
White picture in all the monitors
Check that the coaxial cable to the monitors is con-
nected to the M and V1 terminals of the video unit.
Check the connection between the video and the audio
units. If splitters have been used in the distribution, check
that the voltage between - and + of the splitters is 15
Vdc. Check the connections of the coaxial cable from
the video unit to the monitors. Check the position of the
J1 configuration jumper in the connection brackets. If
failure is not detected, there may be something wrong
with the video unit, any tap-off or any splitter.
White picture in one monitor
Check the position of the J1 configuration jumper in
the connection bracket. Check the connection between
the connection bracket and the monitor. Check the con-
nections of the coaxial cable in the monitor's connection
bracket. Check coaxial's connection from the connec-
tion bracket to the video unit. If failure is not detected
there may be something wrong with the tap-off, connec-
tion bracket or monitor.
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