Maintenance
127
Troubleshooting
In case a problem or malfunction occurs, identify the closest description appearing in Table 8 and
then perform the listed corrective actions.
Table 8. Troubleshooting Chart
Problem Corrective Actions
Blank display CHECK
• DC power cable is connected properly to the radio and battery.
• A 7.5A fuse is installed in the fuse holder located on the green wire of the DC
power cable.
Display present but
weak or no receive
signal or noise
CHECK
• Connection of antenna to antenna tuner and antenna tuner to radio cables (loose
or broken connections).
• Squelch position OFF.
• Correct programming of operating channel (frequency, mode of operation, etc).
Engine noise picked
up by the antenna
Determine by observing difference in the reception by turning the engine ON/OFF.
ENSURE
• Ground leads are properly connected, all power wires and ground leads are as
short as possible
• That noise blanker (if installed) is enabled.
• Install noise reduction Kit TLN8845.
Poor or no
transmission
CHECK
• That a 30A fuse is installed in the fuse holder located on the red wire of the power
cable.
• That proper grounding cables are connected from the radio and from the antenna
tuner to the vehicle chassis.
• While speaking, check RF power bars for activity. The resultant RF power output is
displayed in approximately 15 W increments (bars) being added from left to right.
• If the received signal level (RCVL) indication is low, there may be a problem in the
antenna system. If antenna cabling, antenna mast rigging position has changed
since the antenna was last tuned, the antenna tuner will not be adjusted
automatically. To retune the antenna tuner, scroll to the next channel and
thereafter scroll back. If this procedure does not correct the situation, inspect the
tuner, antenna and ground plane for loose connections or misplaced parts. If no
loose connections are found, call the nearest manufacturer’s suport technician or
service facility for assistance.
• If the low transmit power indication is low, this may be caused by a faulty
microphone, faulty transmitter, overheating, or defective antenna system.
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