TROUBLESHOOTING HINTS
16
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 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' of the sound module or of the EL505 circuit: at that moment the output
voltage between 'CV' terminals of the sound module should be 12Va.c. If it's
so check the lock release, its wiring and the wiring of the terminal 'P' 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 (in case of internal door panels) or to the
corresponding 'CP' terminal of the EL505 circuit (in case of general door
panels).
O
From the moment a call is made on the general entrance door panel, the voltage
between '-' and 'CO' terminals of the internal called door panel should be
lower than 3Vd.c. If not, check the continuity of the 'CO' wire. The same
status should be occurs if the call is made from a internal door panel.
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
is in communication, the busy signal will not be reproduced.
O
NOTE: in case of any problem, check that the connection between the sound
module and the EL505 microprocessed circuit, through the flat cable, is
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