Preventive MaintenanceThe following system checks should be made every six to twelve months:• Check the Standing Wave Ratio (SWR).• Inspect the tightness of all electrical connections.• Inspect the antenna coaxial cable for wear or breaks on the shielding.• Inspect the tightness of all screws and other mounting hardware.TroubleshootingShould the unit malfunction or perform poorly, follow these procedures:If the transceiver is completely inoperative: Check the power cord and fuse.If there is trouble with receiving: Check the VOLUME control setting. Be sure theSQUELCH is adjusted properly. Possibly the radio is over-squelched.If there is trouble with transmitting: Check that the transmission line (coaxial cable)is securely connected to the ANTENNA connector. Check that the antenna is fullyextended for proper operation. Check that all transmission line (coaxial cable)connections are secure and free of corrosion.NOTEBlackening may occur on the Liquid Crystal Display if the UHF CBRadio or optional Remote SPK/MIC has been subjected to extreme hightemperature (above 60°C). This is not a fault. Normal LCD operationresumes when the temperature stabilizes back to standard operatingcondition (0-55°C).Introduction4UNIDEN UH5045 UHF CB Transceiver