TM 55-1930-209-14&P-12 Table 2-3.  Commercial Marine Radio Troubleshooting Component Possible Cause Suggested Action 1.  When marine radio is a.  Circuit breaker a.  Close circuit breaker 10P13A-8 keyed, no sound is 10P13A-8 open heard and TX control Indicator does not light. b.  Volume control in b.  Turn unit on using VOLUME OFF position control. c.  Marine radio inline c.  Check fuse element.  Replace if fuse blown defective. d.  Interconnecting d.  Make sure cable is properly input cabling connected.   If not, check that no disconnected obvious reason exists for condition and plug into receptacle. e.  Power supply faulty e.  Remove and replace power supply. 2.  When transmitting on a.  Incorrect channel a.  Check that proper assigned frequency, only radio selected frequency was selected in sldetone can be accordance with Table 2-2 heard. Tune radio to correct frequency. b.  Remote station out of b.  Ensure that HI-LO POWER range button/switch is in HI position. c  VHF antenna faulty c.  Ensure that antenna is not loose. Table 2-4.  VHF/FM Marine Handheld Transceiver Troubleshooting Component Possible Cause Suggested Action 1.  When handheld trans- a.  Battery pack in need a.  Charge battery pack on battery ceiver is keyed and no of charging charger for 6 hours. sound is heard and TX control indicator does not light b.  Volume control in off b.  Turn unit on using volume position control. c.  Battery pack power c.  Remove and replace (NiCad) supply faulty battery pack. 2.  When transmitting a.  Squelch control too a.  Adjust squelch to proper only a radio sidetone high position. can be heard b.  Antenna is disconnected b.  Connect, tighten, straighten or or damaged repair antenna as necessary c.  Channel selector switch c.  Check that proper assigned out of adjustment frequency was selected in accordance with Table 2-2.  Tune to correct frequency d.  Receiving station is out d.  Ensure that HI-LO power button/ of range switch is in HI position 2-23