Maintenance And Troubleshooting; Common Questions - Uniden UM425 Owner's Manual

Maintenance and Troubleshooting

Maintenance and Troubleshooting
Due to its rugged design, the UM425 requires very little maintenance. Howev-
er, it is a precision electronic instrument, so you should follow a few precau-
tions:
If the antenna has been damaged, you should not transmit except in
•
the case of an emergency. A defective antenna may cause damage to
your radio.
• You are responsible for continued FCC technical compliance of your
radio.
• You should arrange for periodic performance checks with your Uniden
dealer.

Common questions

Problem
The radio won't power on.
The radio won't transmit.
Noise comes out of the
speaker all the time
I can't hear anything (no vol-
ume) from the speaker.
I can transmit, but no one can
hear me.
The display flashes, and I
don't know why.
Things to Try
Check the power connections.
Check the fuse.
Check the master battery switch and branch cir-
cuit that connect to the radio.
Make sure you are not in weather or scan mode.
Make sure you are not trying to transmit on a
receive-only channel (see the channels and fre-
quency tables starting on page 58).
Make sure you are transmitting at the correct
power level for this channel (see the channels
and frequency tables starting on page 58).
Make sure the duration of each transmission is
less than 5 minutes.
Adjust the squelch level; it is probably too low.
Adjust the squelch level; it is probably too high.
Check your UIC channel settings (see Setting the
UIC channel mode (USA/CAN/INT) on page 10).
The display will flash if the radio is in a watch
mode or in scan mode. Try turning off scanning,
Weather Alert Watch, or Triple/Dual Watch (see
pages 10 and 11).
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