OPTIONAL CONNECTIONS
SYSTEM OPERATION
13
O
Nothing operates.
w
Check the output transformer voltage between SEC terminals: it should have 12
to 17Va.c. If not, disconnect the transformer from the installation and
measure again. If it's correct now, it means there is a short circuit in the
installation: disconnect the transformer from mains and check the installation.
O
Inappropriate audio level.
w
Adjust the level volumes as shown on page 6. In case of feedback, reduce the
audio levels until feedback fade out.
O
Door open function no operates.
w
Remember that in systems with several access doors (EL551 sound modules), this
function is only available during call and communication progresses.
w
Disconnect the lock release from the sound module and short-circuit terminals ' '
and 'P': at that moment the output voltage between terminals 'CV' and '~2' (in
case of EL550 or EL554 sound modules) or between terminals 'CV' (in case of
EL551 sound module) should be 12Va.c. If it's so check the lock release, its
wiring and the wiring of the terminal 'P' from the sound module to the
telephones. If these tests don't solve the problem, replace the sound module.
O
No telephones receive the call or acknowledgement call signal is not reproduced.
w
Check that the push buttons common terminal are correctly connected to the
'CP' terminal of the sound module.
O
The door panels don't change to busy status.
w
From the moment a call is made in one of the door panels, the voltage between
' ' and 'CO' terminals should be lower than 3Vd.c. If not, check the continuity
of the 'CO' wire.
O
Once a communication is finished the system remains on busy status.
w
If the busy status remains for a three minutes period, even if the handset of the
called telephone is on the craddle, check that all the telephones are
correctly replaced.
O
The acknowledgement busy signal is not reproduced.
w
When someone tries to make a call during busy status, the light push button
should change its color and busy signal should be heard at the door panel. If
the called telephone is not a T-900 model, and is not correctly replaced or it
–
–
TROUBLESHOOTING HINTS
14
arallel telephones installation.
P
The maximum number of telephones placed
in the same apartment is three.
For each telephone placed in parallel
the section corresponding to the call wire
must be doubled.
Electronic call.
Buzzer call.
ind.
ind.
0
7
0
7
10
10
10
10
5
5
5
5
3
3
3
3
P1
P1
P1
P1
O
O
O
O
O
To make a call the visitor should press the push button corresponding to the
apartment he wishes to contact. An acoustic tone will be heard confirming the
call as the push button is pressed. At this moment the call will be received at the
telephone in the dwelling.
In systems with several access doors, the other(s) door panel(s) will be automatically
disconnected, and the light push button will change to red color: if a visitor tries to
call from other door panel an acoustic tone will be heard confirming the system is
busy. If the call is not answered in 30 seconds, the system will be freed.
To establish communication pick up the telephone handset. In systems with several
access doors, the communication will last for one and a half minutes or until the
handset is replaced. Once the communication has finished the system will be
freed.
To open the door, press the door release push button at any moment.
In systems with several access doors, the door open function can be operated
during call and communication progresses: with one press, the door release
