Trouble Shooting - Alcad GRF-204 Manual Del Usuario

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
Imagen en blanco en uno de los monitores de una vivienda.

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 , 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 connection brackets. If you cannot
find the fault, there may be something wrong with the audio unit.
The call tone doesn’t ring in a monitor/telephone.
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. In installation with several points of entry,
check connections 17,18 between entrance panels. 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.
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/telephones (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 4,2 from the connection bracket/telephone
to the audio unit. If you cannot find the fault, there may be
something wrong with the monitor/telephone.
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 1 on page 19).
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 Vdc. Check that the voltage
between 11, 12 in the audio unit, when you press the lock release
button, is 12 ± 10% Vac. In installations with several points of
entry, make certain that connectors 17, 18 on the panels are
y V of the power
terminals, and check that the voltage
and V in the audio unit is 12
connected up. If you cannot find the fault, the lock may be broken.
In installation with several points of entry, 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 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 connection - 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.
Check the polarity of the twisted pair.
In installation with several points of entry, check that you have
only one entrance panel defined as the main one. Make sure
that the multiple-access video line is correctly loaded
(resistence of 220 ohms in the unused 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: a) if tap-offs have been
connected in series the 120 Ohm resistance must be connected
in series the 120 Ohm resistance must be removed from all
the intermediate tap-offs; b) with monitors in series cut the 120
Ohm resistances on all the connection brackets, but from the
one at the end of the line. c) Check that resistences of 120
ohms are connected in the unused terminals T2+,T2-. 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: with
monitors in series cut the 120 Ohm resistances on all the
connection brackets, but from the one at the end of the line.
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 connection bracket or the monitor.
Auto switch-on does not work on any monitor.
In installation with several points of entry, 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 Vdc. If you cannot find the fault
there may be something wrong with the audio unit.