Alcad TCB-110 Manual Del Usuario página 17

VIDEOPORTERO DIGITAL - DIGITAL VIDEODOOR ENTRY SYSTEMS - VIDÉOPORTIER NUMÈRIQUE
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 D2 and D3 between different entrance panels.
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 coaxial cable to the monitors is connected
to the M and V1 terminals of the video unit. In multiple
access installation, check the M, V2 connections of the
coaxial cable between the different video units. 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 connections
of the coaxial cable in the monitor's connection bracket.
Check coaxial'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.
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