Aiphone LEF-3 Installation & Operation Manual page 15

Problem
5. Call-in LED lights don't light up
when calling master-to-master.
6. In-use LED is always on.
7. Call tone and call-in LED from subs
work fine, but no communication, or
vice versa.
8. When sub calls in, multiple call-in
LED lights come on.
9. Door release doesn't work.
10. All Call from LEF-10S doesn't work.
11. Chime from door station doesn't
work.
12. Chime from door works, but
electronic call tone in LEF masters
also is heard.
13. All Call doesn't work, but BG-10C is
included in system.
14. All Call pretone and voice volume
are too loud or too soft.
15. When an All Call is initiated, all of
the LEDs corresponding to sub
station channels light up.
16. Feedback is heard between
intercom stations in adjacent rooms.
17. Communication to another station is
very weak.
18. LEF system has AC hum when
listening to another station from a
master station.
Call-in LEDs only light when a sub station calls. A responding master
answers handsfree, and therefore does not have to select a station number.
Make sure all masters are in the OFF (standby) position. The station whose
LED above the OFF button is lit is the one that's on. Check R wire for a
short to ground. Take R wire off of terminal. If Occupied light remains lit, the
unit is damaged and needs repair.
Check E & – wires from sub for proper connection to master. See #2
solution above.
Make sure station number wires are not shorted together. Remove all
jumpers between E & – (in multi-master system). Test master station by
taking wires off of affected station # 's, then touch a jumper wire between a
station # and – . If multiple call-in LEDs light up, the unit has sustained
power surge damage and must be sent in for repair.
RY-PA relay is required for each door to be released. Connect black wires to
L & – . For selective door release, connect RY-PA between K#
(matching station # that door is on) and L , which provides 12V DC when
" " button is pressed.
All Call requires the BG-10C Adaptor with power supply.
BG-10C must be installed. Wire from door station must connect to BG-10C,
1 of door to DA / DB / DC of BG-10C. – must be connected from LEF
master to BG-10C.
Door station should be wired directly to BG-10C or first master. Make sure
the A/B switch on the back of the LEF master is in the "A" position. Make
sure R line is connected between LEF master and BG-10C.
Check connection from P1 , P2 , P3 terminals from LEF-10S to BG-10C.
P1 should be 10V DC or higher when All Call button is engaged. P2 and
P3 carry the voice signal from the initiating master to the BG-10C. Be sure
to press TALK while making an All Call announcement, and press All Call
button when finished.
Adjust volume levels on front of BG-10C (located behind metal cover plate).
Make sure jumpers between E & – are removed. When using the BG-10C
for All Call in a system with sub stations, a non-polarized capacitor (NP-25V)
must be installed in series on each station # line that a sub station is on
between the BG-10C and LEF-10S. (See diagram on pg. 12)
Intercom stations should not be mounted back-to-back on the same wall. If
they are, they must be installed at least 60cm (2') apart with insulation
isolating them. Adjust voice volume control downward to eliminate feedback.
Adjust "Voice Vol." upward. Make sure the 1 and – terminals from sub to
master are not reversed.
System wiring must be run at least 50cm (20") away from AC wiring,
fluorescent lights, or dimmer switches. Wires can cross AC at 90 degrees. If
shielded wire was used, tie all of the shields together and ground one end to
an earth ground. If noise persists, isolate source of the noise and separate
the intercom from the source.
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Solution