Uniden UM425 English Owners Manual - Page 56

Maintenance and Troubleshooting Maintenance and Troubleshooting Due to its rugged design, the UM425 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 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 volume) 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 circuit 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 frequency 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). E-52