Operating Problems - Alcad GRF-204 Manual Del Usuario

VIDEOPORTERO ELECTRÓNICO - VIDEODOOR ENTRY SYSTEMS - VIDÉOPORTIER ÉLECTRONIQUE

OPERATING PROBLEMS

Nothing works.
Check the mains voltage in the power supply unit that feeds
the audio unit. Check that the voltage between
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 ithe breakdown continues, disconnect
all the power supply
voltage between and
then there may be something wrong with the power supply.
The card holders do not light up.
Check that the voltage between
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
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 bracket to the
audio unit. If you cannot find the fault, there may be something
wrong with the monitor.
You cannot hear the entrance panel on any monitor.
Check connections 2 and 4 from the audio unit to all the
monitors. Check the volume control on the monitors (on the
panel) and the lighting push button pilot. If you cannot find
the fault, there may be something wrong with the audio unit.
You cannot hear the entrance panel on a monitor.
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 14,5 Vdc. Check the
connection between 7 in the audio unit and the push buttons.
Check connection 2 from the audio unit to the monitors. 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 monitor. 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. 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.
and
and terminals, and check that the
is 12 Vac. If this is not the case
and of the power supply
and in the audio unit
The video system does not work in any monitor: auto switch-on,
screen doesn´t come on a callis received,..
of Check that the voltage of the power supply between - and +
is 15 Vdc. Check the - conexion between the power supply
and the audio unit. 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 unit and check that
voltage between - and + is 15 Vdc. If it's not correct, there
may be something wrong with the power supply.
Video system does not work in one monitor: auto switch-on, screen
switching 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 bracket 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: distorted picture, ghost
images, loss of synchronisation.
Check the polarity of the twisted pair.
Make sure that the multiple-access video line is correctly
loaded (resistence of 220 ohms in the terminals T2+,T2-).
If splitters have been used in the distribution, check that the
voltage between - and + of the splitters is 15 Vdc. Check that
twisted pair line has a 120 Ohm load: with two monitors in
parallel cut the 120 Ohm resistance on the first monitor.
Check twisted pair 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 the polarity of the twisted pair.
Check that twisted pair line is charged with 120 Ohm. Check
the position of the J1 configuration jumper in the connection
brackets. 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 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 monitor.
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 twisted pair to the monitors is connected to the
T1 + and T1 _ 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 twisted
pair from the video unit to the monitors. 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 connection between the connection bracket and the
monitor. Check the connections of the twisted pair in the
monitor's connection bracket. Check twisted pair's connection
from the connection bracket to the video unit. If failure is not
detected there may be something wrong with the tap-off,
connection bracket or monitor.