Bell
Technical Support
System
Tel 0845 121 4008
(Telephones) Ltd
Fax 0845 121 4009
Web
www.bellsystem.co.uk
Lock release buzzes, but
doesn’t unlock
1. Poor connection or damaged wire in the lock
release circuit. Check cable to lock release
and cable to Z / O terminals on the phone.
2. Voltage drop issue; cable diameter is too
small, try doubling up on the lock button
cores Z & O going to the phone(s).
3. Dodgy lock release button on the phone.
Simulate a lock button press by shorting Z &
O to prove.
4. Lock release current is too high (if using a
third party lock release). An additional relay
and suitable power supply maybe required.
Check the lock release current plus 0.5A for
the system does not exceed the power supply
rating.
5. Lock release jammed due to over tight fitting;
check there is some ‘play’ between the lock
and lock release. Do not fit the tongue on the
door to deep.
Lock release operates all the
time.
WARNING: Not all lock
releases are continuously
rated; this may cause it to
burn out.
1. Short on the lock button cable core going to Z
on the phones. Probably to power supply
common (Terminal H or O).
2. Lock release button stuck in or faulty.
Disconnect Z terminal from the phone in
question and see if the fault disappears.
Trades button doesn’t work
(where fitted)
1. No power to the Time Clock, check the time
clock can be forced on.
2. Time clock settings not working, force the
time clock on to check. Note the TS2000(-
BST) time clocks need to see the time
change to operate.
3. Time clock not working. Short the CO and
N/O terminals together to bypass.
4. Break in the trades button circuit.
