Bellcall Digital Door Entry System
PD-083 Issue 3A
Installation and Operating Manual
Page 25 of 46
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 inside the insulation!
Connectors clamped onto 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 even we make is wiring a connector left to right instead of right to left, or
one or more twisted pairs the wrong way round.
Warning.
The heads of screws on connectors are not a reliable means of making a
connection, try pushing the probe into the wire entry point.
Normal System Operation
First a quick run down on how the system should work. A phone can only be picked up
and be active while it is ringing, and only be rung when it is on hook. For the BSA phone if
the red mute LED is flashing the phone is, off hook and cannot converse with the panel.
The system indicates busy when the controller ‘thinks’ another panel is making a call.
Entering a flat number and pressing the
call
pushbutton causes a call to that phone which
replies with an acknowledge and starts to ring, on receipt of the acknowledge the controller
turns on the Status LED.
Answering the phone by picking up the handset sends a corresponding message to the
controller which turns on the Audio relay.
Finally finishing the call by replacing the handset or due to timeout, all the relays and the
status LED will go off. Or finishing the call by operating the lock button will flash the Status
and operate the Lock LED, after 3S the relays (and phone) will go off, at the end of the
lock time the Status LED and the Lock LED will go off. N.B. The 3 S overhang is only with
the BSD-DIG.
In addition to this the Status LED will have diagnostic flashes corresponding to the button
press and the data sent and received. These visually merge with the Status LED going on
and just an off flicker is visible. The pickup and any subsequent phone operation will
cause an off flash.
Quick Fault Reference
Display Problems – BCP1
Display does not indicate
version on power up.
BCP1 – No power
Display does not update when
pressing keys.
BCP1 – Internal fault.
No Power
