FARFISA INTERCOMS ECHOS, Техническое руководство

Страница: 186 / 236

184
(MT11 - Gb2012)
4+1
INTERCOMS
*
7+1
VIDEOINTERCOMS
A whistle is heard at the external door
station (Larsen effect)
The electric door-speaker (amplifier) is badly
housed in the push-button panel. The micro-
phone hole of the external door station might be
clogged. Lower the volume.
Radio reception on the door station
The defect can occur when there is a transmit-
ter working in the proximity. Apply a capacitor
from 0.1µF between terminals 1 and 3 of the
electric door speaker (amplifier).
INTERCOMMUNICATING SYSTEMS
No audio in both channels. Intercommuni-
cating service is not working
Short-circuit between + and - of the power
supply. Faulty power supply.
Calls from the door station work. No audio
in both channels. Intercommunicating ser-
vice is working
No power supply between 3 (+) and 4 (-) of the
electric door-speaker (8Vdc). Faulty power
supply.
No audio from the intercoms to the door
station
The connection between 1 of the intercoms and
G of the power supply has been interrupted.
The connection between D of the power supply
and 1 of the electric door-speaker (amplifier)
has been interrupted. Faulty electric door-
speaker (amplifier). Faulty power supply.
No audio from the door station to the inter-
coms
The connection between 2 of the intercoms and
2 of the power supply has been interrupted. The
connection between C+ of the power supply
and 2 of the electric door-speaker (amplifier)
has been interrupted. Faulty electric door-
speaker (amplifier). Faulty power supply.
The intercommunicating calls work, but
the door station is still connected
Faulty power supply.
The intercommunicating calls do not work
Check that cable 7 is connected to 7 of the
power supply. Faulty power supply.
No audio in the intercommunicating ser-
vice
Faulty power supply.
- Check for the presence of the mains voltage
in the terminals 230Vac (or 127Vac) of the
power supply.
- The power supply is not provided with fuses,
but it is protected against overloading or
short-circuiting by a heat sensor (thermo-
protector), to restore power, it is necessary to
cut OFF the mains voltage for about one
minute. Reconnect power after having elimi-
nated the problem.
- Check the voltage output of the power supply
(see in detail the values indicated in the power
Nothing at all is working
Absence of main voltage. Short-circuit or over-
load of the terminals of the power supply output.
Faulty power supply.
The lock does not work
Faulty lock. Faulty door release push-button.
The cross section of the cables indicated in
bold type is insufficient. A connecting cable to
the lock has been interrupted. Faulty power
supply.
Calls from the door station do not work
The common connection of the push-buttons
on the push-button panel has been interrupted.
Faulty power supply.
A call to an individual intercom does not
work
The connecting wire from the door station to the
intercom has been interrupted. The handset
has not been replaced correctly (in electronic
call systems the ringing sound is reproduced
directly by the loudspeaker of the handset which
is disconnected when the handset is lifted to
avoid ringing sound during the conversation).
Faulty intercom.
No audio from both channels
Absence of power between 3 (+) and 4 ( - ) of
the electric door-speaker (6÷8Vdc). Short-cir-
cuit between + and - of the power supply. Faulty
power supply.
No audio from the intercoms to door sta-
tion
Connection 1 from the intercoms to the electric
door-speaker has been interrupted or short-
circuited. There is no ground connection to
terminal 4 of the electric door-speaker (ampli-
fier). Faulty electric door-speaker (amplifier).
No audio from the door station to the inter-
coms
Connection 2 from the intercoms to the electric
door-speaker (amplifier) has been interrupted
or short-circuited. Faulty electric door-speaker
(amplifier).
Audio with humming in the background
(50/60Hz)
The wires have been canalized together with
the cables that power AC loads. Wrong con-
nections or under dimensioned cross-section
of wires (see recommendation and table on
page 35). Faulty power supply.
TROUBLESHOOTING
PRELIMINARY CHECKS
PROBLEM, REASON AND SOLUTIONS
supply chapter).
- Check that the cross section of the cables
corresponds to what is indicated on page
146 and in the descriptions of each individual
diagram.
SYSTEM WITH MORE ENTRANCES
Entrance A is never activated
Short-circuit between 5 and 6 of the exchanger.
Faulty exchanger.
Entrance B is never activated
Short-circuit between 3 and 4 of the exchanger.
Faulty exchanger. No power supply to 1 and 2
of the exchanger (13Vac).