Aiphone LEF-3 - Manual (Page 11)

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Problem Solution
5. LED lights don’t light up when
calling master-to-master.
Station LEDs only light when a sub station calls. A responding master
answers handsfree, therefore not having to select a station number.
6. Occupied light is always on. 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 unit. If Occupied light remains lit, the unit
is damaged and needs repair.
7. Call tone and LED from subs work
fine, but no communication, or vice
versa.
Check E and - wires from sub for proper connection to master. See # 2
solution above.
8. When sub calls in, multiple LED
lights come on.
Make sure station number wires are not shorted together. F^emove all
jumpers between E & -, Test master station by taking wires off of affected
station #’s, then touch a jumper wire between a station number and negative.
If multiple LEDs light up, the unit has sustained power surge damage and
must be sent in for repair.
9. Door release doesn’t work. 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, L which provides 12V DC when “key” button
is pressed.
10. All Cali from LEF-1 OS doesn’t work. All Call requires the BG-10C Adaptor with PS-12F power supply.
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11. Chime from door station doesn’t
work.
BG-10C must be installed. Wire from door station must connect to BG-10C,
“1” of door to DA/DB/DC of BG-10C. Neg. (-) must be connected from LEF to
BG-10C.
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12. Chime from door works, but
electronic call tone in LEE masters
also is heard.
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.
13. All Call doesn’t work, but BG-10C is
included In system.
Check connection from PI, P2, P3 terminals from LEF-1 OS to BG-10C. PI
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 Cali announcement, and press All Call
button when finished.
14. All Call pretone and voice volume
are too loud or too soft.
Adjust volume levels on front panel of BG-10C.
15. When an All Cali is initiated, all of
the LEDs corresponding to sub
station channels light up.
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 staiton is on
between the BG-10C and LEF-1 OS.
16. Feedback is heard between
intercom stations in adjacent rooms.
Intercom stations should not be mounted back to back on the same wall. If
they are, they must be installed at least two feet, 60cm apart with insulation
isolating them. Adjust voice volume control downward to eliminate feedback.
17. Communication to another station is
very weak.
Adjust “Voice Vol.” upward. Make sure the “1 and terminals from sub to
master are not reversed.
18. LEF system has AC hum when
listening to another station trom a
master station.
System wiring must be run at least 20”, 50cm 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.