Trouble Shooting - Alcad GRF-204 Manual De Instrucciones

V I D E O P O R T E R O E L E C T R Ó N I C O - V I D E O D O O R E N T R Y S Y S T E M S - V I D É O P O R T I E R É L E C T R O N I Q U E

TROUBLE SHOOTING

Nothing works.
Check the mains voltage in the power supply unit that feeds the
audio unit. Check that the voltage between
supply is 12 ±10% 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 and V
between and V is 12 ±10%Vac. If you cannot find the fault,
there may be something wrong with the power supply.
The lighting push-button pilot does not light up.
Check that the voltage between
± 10% Vac. If the voltage is correct, there may be something
wrong with the audio unit.
The card holders do not light up.
Check that the voltage between 9 and 10 in the audio unit, with
the lighting push-button activated, is 12 ±10% Vac. Check whether
the lamp is burnt out.
The call tone doesn’t ring on any monitor/telephone.
Check that the voltage between 7, 2 in the audio unit, without
pressing the push-button, is 14.5 ± 10% 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
5, 2 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/telephones. If you
cannot find the fault, there may be something wrong with the
audio unit.
No monitor/telephone can be heard from the entrance panel.
Check connections 3, 2 from the audio unit to all the
monitors/telephones. Check the volume control on the panel. If
you cannot find the fault, there may be something wrong with the
audio unit.
One monitor/telephone cannot be heard from the entrance
panel.
Check connections 3, 2 from the connection bracket/telephone
to the audio unit. If you cannot find the fault, there may be
something wrong with the connection bracket/telephone or the
monitor.
You cannot hear an entrance panel on any monitor/telephone.
Check connections 4, 2 from the audio unit to all the
monitors/telephones. Check the volume control on the monitors
(on the panel). If you cannot find the fault, there may be something
wrong with the audio unit.
You cannot hear the entrance panel on a monitor/telephone.
Check connections 2 and 4 from the connection
bracket/telephone to the audio unit. If you cannot find the
fault, there may be something wrong with the monitor.
The sound produces feedback.
Lower the sound level using the volume control on the audio unit.
If the feedback persists, remove the J2 jumper and repeat the
adjustment (see step 7 on page 14).
The electric lock doesn’t work.
Check that the voltage between 1, 2 in the audio unit, without
pressing the lock release button, is 5 ± 10% Vdc. Check that the
voltage between 11, 12 in the audio unit, when you press the lock
release button, is 12 ± 10% Vac. In multiple access installations,
make certain that connectors 17, 18 on the panels are connected
up. If you cannot find the fault, the lock may be broken.
In multiple access installation, when you call one of the panels
the rest of the panels in the system are not disabled.
Make certain that connectors 17, 18 on the panels are connected
up. Check that the voltage between 17, 18 in each one of the
audio unit is 8 ±10% Vdc when you press the push-button on one
y V of the power
terminals, and check that the voltage
and V in the audio unit is 12
of the panels. If you cannot find the fault, there may be something
wrong with the audio units.
The video system does not work in any monitor: 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 ± 10% 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 ± 10% 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 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 bracket and the monitor. Check
that the voltage between - and + of the connection bracket is 14
± 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.
In multiple access installation, check that you have only one
entrance panel defined as the main one. If splitters have been
used in the distribution, check that the voltage between - and +
of the splitters is 14 ± 15% Vdc. Check that coaxial cable line has
a 75 Ohm load: a) if tap-offs have been connected in series the
75 Ohm resistance 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;
c) Check coaxial connection in splitters and tap-offs. If you cannot
find the fault, there may be something wrong with the video unit.
Check that resistences of 75 ohms are connected in the unused
terminals V2, M. 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: iwith
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.
In multiple access installations, check that one entrance panel has
been defined as the main one and check connections 17, 18
between different entrance panels. Check that the voltage between
1, 2 of the audio unit, without pushing the auto switch-on button
is 5 ± 10% Vdc. 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.
Blank screen on all the monitors.
Check the connection between the video and the audio units.
Check that the coaxial cable to the monitors is connected to the
V1 and M terminals of the video unit. If this is the case, check
connections V2, M and V4, M of the video units of the installation.
If splitters have been used in the distribution, check that the voltage
between - and + of the splitters is 14 ± 15% Vdc. Check the
connections of the coaxial cable from the video unit to the monitors.
If failure is not detected, there may be something wrong with the
audio unit, video unit or any splitter.
Blank screen on all the monitors of a dwelling.
Check the position of the J1 configuration jumper in the connection
bracket. Check coaxial's connection from the connection bracket
to the video unit. If splitters have been used in the distribution,
check that the voltage between - and + of the splitters is 14 Vdc
± 15%. If the fault cannot be found, there may be something wrong
with the tap-off of that floor or the splitter of he dwelling.