Uniden UM423 AM, Руководство пользователя

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Maintenance and Troubleshooting
26
Maintenance and Troubleshooting
Due to its rugged design, the UM423 AM 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 Things to Try
The radio won’t power on. Check the power connections.
Check the fuse.
Check the master battery switch and branch circuit
that connect to the radio.
The radio won’t transmit. Make sure the duration of each transmission is
less than 3 minutes.
Noise comes out of the speak-
er all the time
Adjust the squelch level; it is probably too low.
I can’t hear anything (no vol-
ume) from the speaker.
Adjust the squelch level; it is probably too high.
I can’t read the display. Adjust the backlight brightness level (see page 16)
The display is too bright at
night.
Adjust the backlight brightness level.
(see page 16)
Where can I find my radio’s se -
rial number?
Look on the bottom side of the radio
Engine Noise Suppression
Interference from the noise generated by the electrical systems of engines
is sometimes a problem with radios. The UM423 AM has been designed to
be essentially impervious to ignition noise and alternator noise. However, in
some installations it may be necessary to take measures to further reduce
the effect of noise interference. The UM423 AM radio DC battery wires,
antenna lead, and accessory cables should be routed away from the engine
and engine compartment, and from power cabling carrying high currents.
In severe cases of noise interference, it may be necessary to install a noise
suppression kit. Contact the dealer where you purchased the radio for more
information.
UM423 AM.indd 26 28/9/11 11:59:07 AM