Maintenance And Troubleshooting; Common Questions - Uniden UM455 Owner's Manual

Maintenance and Troubleshooting

Maintenance and Troubleshooting
Due to its rugged design, the UM455 requires very little maintenance. However, it is
a precision electronic instrument, so you should follow a few precautions:
• 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 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.
I can't read the display.
The display is too bright at
night.
I can't see any words on the
display.
Things to Try
Check the power connections.
Check the fuse.
Check the master battery switch and branch
circuit that connect to the radio.
Make sure you are not in scan mode.
Make sure you are not trying to transmit on a
receive-only channel (see the channels and
frequency tables starting on page 57).
Make sure you are transmitting at the correct
power level for this channel (see the channels and
frequency tables starting on page 57).
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 12).
Adjust the contrast and backlight brightness level
(see page 22)
Adjust the backlight brightness level.
(see page 22)
Reset the radio back to the default contrast level:
turn off the radio; hold the menu key and turn it
back on.
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