Troubleshooting Guide - Videx VK4K Series Installation Handbook

VK4K/6458 Series "6 wire Bus" videokit

Troubleshooting guide

In case of system failure, try the following preliminary checks:
• Check that the cables are connected as shown in the installation diagram and that the cables are firmly fixed into the relevant terminals;
• Check that the mains voltage is available on terminals 230Vac (or 127Vac) and 0 of the power transformer Art. 850K;
• Check the 24Vac voltage output of the power transformer Art. 850K. If this voltage is not available it could be the 1,6A fuse, in this case
remove the mains voltage, remove possible short-circuits or overload sources then replace the fuse with an equal or equivalent one.
• Check that the voltage between the terminals "+" and "-" of the speaker unit is between 16 and 20Vdc.
If the problem persists try the tests in the following table or contact technical support.
SYMPTOM
The door station is not able to call the ex-
tension (the bell LED is switched on for 2
seconds):
External call works but when answered
the communication fails:
During the conversation it is not possible
to open the door:
During the conversation it is not possible
to open the door but the key LED on the
door station switches on for the program-
med time:
Speech only from outside to inside:
Low volume of speech:
Noise over the speech line during the con-
versation:
Camera recall service does not work:
Intercommunicating call does not work:
The video shown on the monitor is of a bad
quality and the image is distorted or double
Local call does not work:
VK4K/6458 Series - Installation handbook
CAUSE
• Wrong connection between door sta-
tion and the videophone
• Cable size too small.
• Programmed videophone address in-
correct.
• You have changed the videophone ad-
dress without power down the system.
• Cable size too small.
• Cable size too small.
• Incorrect position of J2 jumper.
• Electric lock wires unconnected or in short.
• Wrong electric lock type.
• Wire "2" broken or in short.
• Volume trimmers of door station require
adjustment.
• The 6 common wires are cabled to-
gether with 230 or 380Vac power lines.
• The 6 common wires are cabled to-
gether with 24Vac videophone power
supply wires.
• Camera recall button pressed for a num-
ber of times different from the ID of the
door station to be switched on.
• "Key" button pressed for a number of
times different from the videophone ad-
dress value.
• V1,V2 signals unconnected, reversed or
shorted.
• The switches of the two way dip-switch
are not both in ON position.
• V1,V2 of the last Art. 316N (if present)
not closed with 75 Ohm resistor.
• Wrong connection or call button broken. • Check connection or replace the button.
6
SOLUTION
• Check the 6 common wire connections
especially wire "1" (speech line/data).
• Increase cable size or double up using
two wires for each connection.
• Check videophone address on dip-swi-
tches.
• Power down the system then power up
again to detect the new videophone ad-
dress.
• Increase cable size or double up using
two wires for each signal.
• Increase cable size or double up using
two wires for each signal.
• Check J2 position on the door station.
• Check connection.
• Check that the electric lock type (ac or dc)
is suitable for the J2 position chosen.
• Check connection of wire "2".
• Adjust the trimmers until the required
volume is reached.
• Separate the 6 common wires from the
high voltages cables.
• Separate the 6 common wires from the
two 24Vac wires or cable them together
only for a short distance.
• Check the ID (1..4) of the door station to be
recalled and press the camera recall but-
ton as many time as the ID value.
• Check the address of the videophone
you are calling and try again.
• Check that the wires are not broken or
shorted.
• Set both switches to the ON position.
• Use 2x 75 Ohm resistors to connect V1
& V2 to 0V.
66251410-EN - V 3.4 - 31/08/16