8
Chapter 5
Maintenance
Troubleshooting
The table below contains troubleshooting information for problems which can occur during normal operation. This
manual cannot list all malfunctions that may occur, or their corrective actions. If a problem is not listed or is not
corrected by the listed actions, notify a qualified service center.
Maintenance
Cleaning the Load Resistor
Wipe the load free of dust and dirt when necessary. Excessive dust on the cooling fins will interfere with heat
dissipation. Clean the RF connector, both metallic and insulating surfaces, with a dry, non-residue forming solvent.
Inspecting the Load Resistor
Inspect the unit every six months. Check for coolant leakage around the clamping band and the thermoswitch. Also
check for corrosion.
WARNING
Never attempt to connect or disconnect RF equipment from the transmission line
while RF power is being applied.
Leaking RF energy is a potential health hazard.
WARNING
Disconnect the unit from all power sources before servicing.
The unit may be energized from multiple sources.
The potential for electric shock exists.
Problem
Possible Cause
Correction
Overheating
radiator.
RF power too high.
Lower RF power. See
Coolant level too low.
Check the coolant level. Add coolant if
necessary. See
Coolant degraded.
.
Faulty resistor.
Replace the resistor. See
Leaking
coolant.
Loose clamping band.
Tighten the clamping band.
Defective or improperly
installed O-ring.
High or low DC
resistance.
Loose RF input connector. Tighten connector.
Faulty RF input connector. Replace connector. See
Faulty resistor.
Replace the resistor. See
