PAGE 23 of 24 VR4K (4+1) SERIES TECHNICAL MANUAL VER1.1
TROUBLE SHOOTING
SYMPTOM TEST
No speech from the door panel to the
telephone.
Check terminal 2 on the amplifier for continuity to
terminal 2 on the telephone.
Check the voltage drops to approx. 1Vdc after the
handset is lifted. (If not try another telephone)
If all else fails try another amplifier at the door station
No speech from the telephone to the door
panel.
Check terminal 1 on the door panel amplifier for
continuity back to terminal 1 on the telephone.
Check the voltage drops to approx. 4Vdc after the
handset is lifted. (If not try another telephone)
If all else fails try another amplifier at the door station
No speech in either direction
Check the 315mA fuse in the power supply
Check for 12Vdc across terminals + & - on the door
panel amplifier. This should be there all the time and
comes directly from the PSU.
Lock will not operate from telephone
Check terminal 5 on the telephone. This terminal
shorts to terminal 3 of the telephone when pressed
(Becomes 0V) and sends a 0V to terminal 5 on the
VX136 amplifier at the door panel which in turn
triggers the relay
Check the relay on the VX136 is energising. Use a
continuity meter to check the switching.
Nothing happens when call button is
pressed
Check the common of the button is connected to T
on the VX136
Check continuity from the other side of the call
button to terminal 4 on the handset
Hum on the speech lines
Ensure all intercom cables do not run close to higher
voltage cables
Try another amplifier at the door panel.
Rolling or poor video picture
Check camera jumper setting is set correctly
Check end of line resistors are fitted on last 316
video splitter (Non-coax) or end of line resistors plus
termination resistors on any unused outputs of the
894 video splitter (Coax).
Check dip-switches are set correctly on videophone
On multiple door systems, check that only one
camera is being switched on at a time. (When
camera is switched on it will have 20Vdc across +&-
Camera recall does not work
Check terminal TV1 (● button) wire for continuity to T
of relevant door panel.
On multiple door systems, lifting the
handset causes feedback or speech from all
doors at the same time.
Dip switch 4 of the amplifier is switched on. This
switch can only be on, for one door systems.
Remember to power down after making the change.
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