Dexaplan VT 623 - Manual (Page 23)

GB / IE - 25
Troubleshooting
Fault
No image is displayed, the operating status
LED does not light
No sound
Nothing happens after pressing the doorbell
button, “NO SIGNAL” is displayed on the
monitor after pressing the Monitor button
and the operating status LED lights red
“NO SIGNAL” is displayed on the monitor
after pressing the Monitor button or the
doorbell button and the operating status LED
lights red
No image is displayed after pressing the
doorbell button, the LED display lights green
A whistling sound can be heard
The image is displayed in black and white
and maybe flickering
Dark monitor image during twilight /
darkness
The image is also too dark during daylight
The monitor image displays a bright
background, however the visitor is displayed
dark
Remedy
Check the power supply
Remove the fuse holder [52] from the rear side of the
indoor station and replace the fuse with an equivalent
one (1 spare fuse is supplied)
Correct the polarity of the connection
Check the connection and polarity
Use a suitable cable (wire cross section at least 0.75
mm², max. length 75 m)
Check the connection and polarity
Change the settings in the settings menu
Place the indoor and the outdoor stations further apart
from each other
Reduce the volume on the indoor station
Regulate the volume on the indoor station
Check the power supply
Correct the polarity of the connection
Switch the monitor on and off using the Monitor button
[38]
Set the system to PAL
Arrange additional lighting
Change the mounting height of the indoor station or
adjust the monitor brightness
Install additional lighting or change the installation
location of the outdoor station
Cause
The power supply is interrupted
The fuse has blown
The connection between the outdoor station and
the indoor station has been interrupted
The polarity of the connection between the outdoor
station and the indoor station is not correct
The volume on the indoor station has been set too
low
The power supply is interrupted
The polarity of the connection between the outdoor
station and the indoor station is not correct
The connection between the outdoor station and
the indoor station has been interrupted
The cable is too long or its cross section is too small
The settings cause a “black” image
It is produced by acoustic feedback
The video signal is not switched correctly
The wrong video system has been set
The outdoor station needs additional light in order
to be able to display a good image
Your viewing angle to the monitor is unfavourable
There is too much backlighting in the background