Bird Technologies 8630B Series - Manual (Page 48)

Bird 8630B Series Moduload RF Load Resistor
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1. Turn the load on end, with the RF input connector up, to allow
debris, if present, to fall out of the load housing.
2. Loosen and remove the 1/4-20 x 5/8 inch hex head screws from the
flanged end of the load housing assembly as shown in Figure 9.
3. Remove the outer conductor assembly.
4. Remove the input center conductor assembly by pulling it out of
the load housing assembly.
Input Center
Conductor
Assembly
Refer to Figure 10 while following the instructions below.
Model 8730A, (used in the Model 8635 and 8635B), 1-5/8 inch EIA
flanged input connector only.
1. Remove the 1/4-20 x 3/4 inch pan head machine screw and 1/4
inch split lockwasher by unscrewing the screw while holding the
center conductor stationary.
2. Remove the center conductor, the center conductor adapter, and
the insulator from the rest of the assembly.
3. Remove the resistor fitting by pushing the exposed end of the
fitting into the outer flow tube. The resistor fitting and any broken
pieces of resistor will fall from the opposite end of the outer flow
tube.
4. Inspect all O-Ring seals, metal and internal parts for damage. The
metal parts may be discolored or oxidized and may be cleaned by
rubbing them with fine abrasive cloth or silver cleaner. The Teflon
parts can be cleaned with detergent and water. If any of the
internal parts are damaged, they must be replaced to ensure
proper electrical and/or thermal performance of the load.
5. Insert the replacement resistor into the resistor fitting. If the
fitting is loose press the slotted finger contacts of the fitting
together slightly and try the resistor again. Continue this
procedure until a snug fit is obtained.
6. Reassemble the center conductor assembly by first replacing the
outer flow tube seal O-Ring. If needed, insert the resistor and
resistor fitting in position in the outer flow tube.
7. Replace Insulator center conductor adapter, and center conductor.
Tighten in place with 1/4-20 x 3/4 Inch pan head machine screw
and 1/4 inch split lockwasher.