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VR4K-1/CL TECHNICAL MANUAL
VER1.2
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 ter & - 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.
Codelock not operating
Check power on terminals 1 & 2 on the codelock is
12V. If this voltage is lower it may not operate the
relays correctly.
Check the keys beep when pressed. This will not
happen if the codelock is faulty or has the incorrect
power connected to terminals 1 & 2
Try re-programming the codelock
