Troubleshooting - Firecom 210 Installation & Operation Manual

If the intercom system does not operate as expected, check the following items:
• Check for power at the intercom and confirm that the fuse is not blown or the circuit breaker is not tripped.
• Confirm that a dedicated ground is used for the intercom power and not a chassis ground.
• Check for corrosion on headset plugs.
• Check that the headsets are plugged in all the way.
• Check headset controls.
If these steps do not correct the problem, review the chart below for symptoms and recommendations.
SYMPTOM
Intermittent crackling in headset
speakers
Alternator whine and other
distracting noises
No sound in headset speakers
You can hear others on the intercom,
but they cannot hear you

TROUBLESHOOTING

RECOMMENDED SOLUTION
• Check the headset plug. Make sure it is clean for best electrical
contact.
• Check wire connections at the headset module.
• Check wire connections at the intercom.
• Check the CA cable and RJ-12 connectors.
Tip: Determine if the problem is with the headset or the headset
module by plugging the headset into another module and retesting.
• Connect both the intercom and radio to the cleanest power source
possible, without sirens, strobes, flashers, and motors (i.e. wipers,
heater, etc.).
• Check the power and ground connections for both the intercom
and the radio. Make sure they are clean and tight.
• Ensure that power and ground wires for the radio and intercom are
no smaller than 18 AWG.
• Check MR cable for proper wiring connections.
• Make sure that all battery connections are clean and free from dirt
and corrosion.
• Use separate noise filters on radio and/or intercom power as needed.
• Use a robust common ground for both the radio and the intercom.
Tip: Check the power to the intercom for an AC signal. There should
be less than 300mVAC present on power lines.
• Check the volume control on the headset.
• Check the headset plug. Make sure it is clean for the best electrical
contact.
• Confirm that the intercom has adequate power.
• Check wire connections at the headset module.
• Check wire connections at the intercom.
• Check the CA cable and RJ-12 connector installation.
Tip: Determine if the problem is with the headset or the intercom
system by plugging the headset into another headset module and
retesting.
Tip: Substituting suspect components in the system may be helpful in
tracking down problems.
• Confirm that you have the headset microphone close to your
mouth; within 1/8 inch is recommended.
• If you have an intercom only headset, press the PTT button on your
headset. See the Operation section of this manual for PTT activation
details.
• Check the headset plug. Make sure it is clean for the best electrical
contact.
• Check wire connections at the headset module.
• Check wire connections at the intercom.
• Check the CA cable and RJ-12 connector installation.
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