Alcad PDK-01100 Manual Del Usario página 24

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
DIGIT AL DOOR ENTRY SYSTEMS
White picture in one monitor
.
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.
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.