ADVANCED TROUBLESHOOTING
35.
M) ENGINE NOISE AND SIRENS ARE PRESENT IN TRANSMIT AUDIO
1. Review the set up and operation of the intercom volume. See “Volume Controls”
(page 25). The intercom volume is possibly set too high.
2. Inspect the headset microphones, making sure that all slots on both sides of the
mic are clean and unobstructed. Obstruction of these slots will hamper or defeat the
noise canceling characteristics of the mics.
3. Check adjustment of the Transmit Audio. See “Intercom Adjustments” (page 17).
Too much gain here will cause excessive background noise to be transmitted along
with the voice. In the worst case, the voice will be somewhat distorted when trans-
mitting from a quiet place, and will become unintelligible in the presence of back
ground noise.
N) INTERCOM VOLUME CONTROL HAS NO EFFECT
• Contact Firecom for a Return Materials Authorization (RMA) Number to return
the Intercom Unit for repair..
O) REMOTE HEAD DOESN'T WORK
1. Make sure the CA Cable is inserted all the way.
2. Make sure the cable ends were installed correctly, see (Figure 31) on page 27.
3. Check that the ribbon cable from the membrane switch is fully inserted into the
edge connectors on the circuit board.
4. Contact Firecom for a Return
Materials Authorization (RMA) Number
to return
the head for repair.
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