Firecom 3000B Installation & Operator's Manual page 15

3000B
EXTENDED TROUBLESHOOTING EXTENDED TROUBLESHOOTING
EXTENDED TROUBLESHOOTING EXTENDED TROUBLESHOOTING EXTENDED TROUBLESHOOTING
T T T T T roubleshooting an intercom system that has roubleshooting an intercom system that has roubleshooting an intercom system that has roubleshooting an intercom system that has roubleshooting an intercom system that has
been working properly but has failed been working properly but has failed
been working properly but has failed been working properly but has failed been working properly but has failed
(A) (A) (A) There is no sound in the headset from either in- (A) (A) There is no sound in the headset from either in- There is no sound in the headset from either in- There is no sound in the headset from either in- There is no sound in the headset from either in-
tercom or radio. tercom or radio.
tercom or radio. tercom or radio. tercom or radio.
1. Check the headset location for proper orientation
and replace any faulty components.
2. If the headset location checks good, verify that
power is present at pin 20 and that ground is
present at pin 1 by verifying a voltage of at least
11.5 volts between those two pins. If power is
present the red LED on the intercom faceplate
will light when the toggle switch is in the RECORD
position (the green LED will always light on an
intercom without a DMR). If power is not present,
check the wiring to the intercom and any switches,
fuses, or circuit breakers in the power circuits to
the intercom and correct any faults.
3. If there is power to the intercom and it doesn't
work, the intercom unit is bad. Remove it for re-
pair. Contact FIRECOM FIRECOM FIRECOM FIRECOM
FIRECOM
(B) There is no sound in the headset from the radio, but
the intercom is okay.
1. Verify that the receive audio is present by listen-
ing to the radio's speaker. If there is no audio
from the radio's speaker, disconnect the radio in-
terface port connector from the back of the inter-
com unit. If there still is no audio from the radio's
speaker, the radio or wiring is at fault.
2. If the radio is putting out receive audio, check the
connections to pins 13 and 21 of the intercom.
An open will cause no receive audio.
3. If no wiring fault is found, try swapping the inter-
com unit with a known good one to verify that the
problem is not the wiring. If no fault can be found
in the wiring, then the intercom unit is bad and
should be removed for repair.
(C) (C) (C) There is no sound in the headset from the inter- (C) (C) There is no sound in the headset from the inter- There is no sound in the headset from the inter- There is no sound in the headset from the inter- There is no sound in the headset from the inter-
com, but the radio is okay com, but the radio is okay com, but the radio is okay. . . . . com, but the radio is okay com, but the radio is okay
1. Verify that the headset location is good, replace
any faulty headset location components.
2. If the headset location checks good, the fault must
lie in the intercom unit. Remove it for repair.
(D) (D) (D) (D) There is no sound in one ear (D) There is no sound in one ear There is no sound in one ear There is no sound in one ear There is no sound in one ear. . . . .
1. The headset is faulty. Remove it for repair.
for return authorization.
(E) Y Y Y Y Y ou can hear others on the intercom but they (E) (E) ou can hear others on the intercom but they ou can hear others on the intercom but they
(E) (E) ou can hear others on the intercom but they ou can hear others on the intercom but they
cannot hear you. cannot hear you. cannot hear you.
cannot hear you. cannot hear you.
1. If the headset is a jumpseat type headset, be sure
that the black PTT button is fully depressed when
trying to talk on the intercom.
2. Verify that the headset location is good. If it ap-
pears that the headset is the faulty component,
check the phillips head set screws on the mic el-
ement for proper tightness before removing the
headset for repair.
(F) (F) (F) Y Y Y Y Y ou can't hear others on the intercom but they (F) (F) ou can't hear others on the intercom but they ou can't hear others on the intercom but they ou can't hear others on the intercom but they ou can't hear others on the intercom but they
can hear you. can hear you. can hear you. can hear you. can hear you.
1. Verify that the headset location is good. Replace
any faulty headset location components.
2. If the headset location checks good, the fault must
lie in the intercom unit. Remove it for repair.
(G) There is a loud squeal in the intercom system (G) (G) (G) (G) There is a loud squeal in the intercom system There is a loud squeal in the intercom system There is a loud squeal in the intercom system There is a loud squeal in the intercom system
when intercom volume is turned up. when intercom volume is turned up.
when intercom volume is turned up. when intercom volume is turned up. when intercom volume is turned up.
1. Check for an open mic too near the speakers of a
headset. Feedback problems are often fixed by
turning the intercom volume down, moving the mic
away from the headset speakers, or unplugging
the smaller jack on the headset's com-cable when
not in use.
2. If the problem persists, unplug the headset loca-
tions one at a time from the rear of the intercom
unit until the squeal stops. Most likely there is a
short in that location's cabling. The cable should
be unplugged from both its HM-1 and the inter-
com unit and checked for shorts between con-
ductors. If any are found, the cable will need to
be replaced.
(H) (H) The radio receive is weak. (H) (H) (H) The radio receive is weak. The radio receive is weak. The radio receive is weak. The radio receive is weak.
1. Check the setting of the radio's volume control.
The radio's volume control is the only adjustment
for receive audio level in the intercom systems.
2. Verify proper connection of radio interface pins
13 and 21.
3. If no fault is found and another intercom unit is
available, try swapping a known good intercom
with the suspect one. If the problem goes away,
the fault is in the suspect intercom unit. Remove
it for repair. If the problem persists, call
COM COM COM COM technical support COM
FIRE- FIRE- FIRE-
FIRE- FIRE-
for assistance.
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