Bird Technologies 8000 Series - Manual (Page 20)

b. Inspect the load for completeness and
general condition of the equipment.
c. A Troubleshooting Chart lists the com-
monly encountered problems, their
possible causes and remedies. Use this
chart as a guide when analyzing
symptoms.
Preventive Maintenance
Due to the basic simplicity of construction, the major re-
quirement for preventive maintenance is to keep the equip-
ment clean, particularly the radiator fins. It is important to
maintain the heat transfer efficiency of the cooling fins.
RF Assembly Test
DC Resistance
Check the condition of these load resistors by accurate mea-
surement of the dc resistance between the inner and outer
conductors of the RF input connector. Use a resistance
bridge or ohmmeter with an accuracy of one percent or
better at 50 ohms for this purpose. The measured resistance
should be a nominal 50 ohms. For greater accuracy the re-
sistance of the load should be carefully checked prior to use
at ambient room temperature. This resistance value should
be recorded and used as a reference. Subsequent resistance
measurements should not deviate more than two percent
from this value.
Disassembly
Except for the “QC” connector, “SQC” on Model 8431, there
is no disassembly possible with these loads. To change the
connector use the following procedure.
RF Connector
The connector is a “QC” design which permits easy inter-
change with the use of only a screwdriver. This process does
not interfere with the essential coaxial continuity of the load
resistor RF input. For replacement, proceed as follows:
a. Remove the four 8-32 x 5/16 inch pan
head machine screws from the corners
of the RF connector.
b. Pull the connector straight out of its
socket.
Bird Model 8000 Series Termaline Coaxial Load Resistor
12