Bird Technologies 8750 Series - Manual (Page 19)

9
Chapter 5 Maintenance
General
The Models 8745/46 Termaline Load Resistors are rugged and simple, requir-
ing only nominal and routine attention. The load is designed to operate satis-
factorily for long periods of time if care is taken not to exceed its power
handling capabilities.
Troubleshooting
For corrections requiring repair or replacement of components, refer to the
appropriate section for your specific model.
Cleaning
Outside Surface
The outside surface of these loads should be wiped free of dust and dirt when
necessary. The principle maintenance required by the operator will be to peri-
odically wipe the accumulated dust and lint off of the load housing. If the Tef-
lon insulator or metallic contact surfaces of the connector should become dirty
or grimy, wipe them off with a soft cloth. Use a contact cleaner that is self-dry-
ing and leaves no residue to clean the hard to reach internal portions.
Note: Always handle the load with care to prevent subjecting it to
unnecessary shock or impact.
Inspection
With the rugged and simple construction of the loads, periodic inspection will
only be necessary at six-month intervals. Inspection should include the items
listed below:
z Cleanliness - Keep the housing and connector free of grime.
z Inspect the load for completeness and general condition of the equipment.
z A Troubleshooting Chart lists the commonly encountered problems,
their possible causes and remedies. Use this chart as a guide when
analyzing symptoms.
WARNING
Never attempt to disconnect the equipment from the transmission line while
RF power is being supplied. Leaking RF energy is a potential health hazard.
Problem Possible Cause Correction
Transmitter shuts off or
will not stay on. Low water flow (for units with flow
interlock) Increase cooling water flow.
High load VSWR. Failing resistor (resistance
change of greater than 5 ohms). Replace resistor.
Loose input connector. Tighten conntector.