Alcad ALS-020 Manual De Instalación página 21

lowest position (put the cancelled speaker symbol). If
no fault is detected, the telephone or the pushbutton
of the panel may be defective.
The entrance panel emits beeping tones
when a call is made
If the problem occurs with all the telephones, check
the connection B1, B2 of the power supply unit
interface to the telephones.
If the call has not rung on the telephone and if the
problem occurs from all the entrance panels of the
installation, make sure that the telephone has been
programmed and that the receiver of the telephone
has been hung up. Check that the programming
switch of the telephone is set to the ON position.
Re-check connection B3, B2 of the audio unit to
the power supply unit interface and connection
B1, B2 of the power supply unit interface to the
telephones. If no fault is detected, the telephone or
other equipment of the installation may be defective.
If the problem occurs from only one of the entrance
panels of the installation, check the connection of this
panel with the other panels. If no fault is detected,
the audio unit of this panel may be defective.
No telephone can be heard at the en-
trance panel
Check connection 30 between the speaker-
microphone module and the audio unit. Check the
setting of the volume control in the audio unit. If no
fault is detected, the speaker-microphone module
may be defective.
One telephone cannot be heard at the
entrance panel
Check the connections of the cable between the
receiver and the base of the telephone. Check the
hang-up pushbutton on the base of the telephone. If
no fault is detected, the telephone may be defective.
2-WIRE DOOR ENTRY SYSTEMS
The entrance panel cannot be heard on
any telephone
The entrance panel cannot be heard on
one telephone
The electric lock does not work
Automatic switch-on does not work on
any telephone
Automatic switch-on does not work on
one telephone
Check connection 30 between the speaker-
microphone module and the audio unit. Check the
setting of the volume control in the audio unit. If no
fault is detected, the speaker-microphone module
may be defective.
Check the connections of the cable between the
receiver and the base of the telephone. Check the
hang-up pushbutton on the base of the telephone. If
no fault is detected, the telephone may be defective.
Feedback is produced on all the telephones
Check the volume controls in the audio unit. If no
fault is detected, the speaker-microphone module
may be defective.
In the audio unit, disconnect the wires of terminals
11, 12 or 11, 12c, as applicable to your case.
Check the voltage between these terminals, making
a bridge between terminals 22 and 18. If there is no
voltage or if the voltage is lower than that specifi ed,
the audio unit may be defective. If the voltage is
correct, check the connections of the electric lock.
If no fault is detected, the electric lock may be
defective.
Check that the system is not engaged. Check that
only one entrance panel has been defi ned as the
main panel of the building (positions of SW1
switch of the audio unit: see illustration showing
microswitch 1 up and microswitch 2 down). If no
fault is detected, the audio unit may be defective.
Check that the system is not engaged. If no fault is
detected, the telephone may be defective.
ENG-21