bell
issimo
1 Way Video Entry System
PD-097 Issue 4
Installation and Operating Manual
Page 21 of 40
Troubleshooting
Common Faults
A very high percentage of calls to our technical support number, regarding new
installations, are resolved to faulty wiring. The reasons for these are various: -
Broken cores, especially short links, sometimes broken inside the insulation!
Connectors clamped onto the insulation instead of copper.
Wire in the wrong side of a rising clamp connection, the clamps need to be unscrewed
far enough to stop the wire going “underneath”.
Shorts or opens due to cables having been stapled or nailed through.
A common fault is wiring a connector left to right instead of right to left, or one or more
twisted pairs the wrong way round.
Tip
. The heads of screws on connectors are not a reliable means of making a connection
with a meter, try pushing the probe into the wire entry point.
Quick Fault Reference
These tables provide a quick indication of the possible fault.
Power Problems
Videophone resetting
(The three indicators lights
show the power on sequence).
Power supply intermittent short or overload.
More than 1 extension enabled for auto display.
Lock output short-
circuit; see ‘Lock Problems’.
28V LED does not light on
controller.
Temporarily remove connection to 28V+ output. If it
now comes on there is a short on the phone cabling.
12V input connections are reversed or missing.
PS4 output voltage fluctuating,
meter reading unstable.
Output overload is causing current limit to operate.
See Lock Problems below.
Call Problems
Videophone does not ring or
flash when called.
Videophone off hook or muted.
No power to videophone; check that red lamp
flashes when handset is picked up.
Data wiring has a fault, Data A or B broken.
0V to controller missing on separately powered
videophone.
Pushbutton wiring error, try short length at
controller.
No extension videophone rings
or flashes when called.
Master videophone off hook or muted.
Green Lock light on videophone
flashes once when called.
Videophone set to extension with no master
present or responding.