Bird Technologies 8650B Series - Manual (Page 37)

Maintenance
25
Replacing Fractured Resistors or Damaged Internal Parts
Removing Resistor
Note: Refer to Figure 11 on page 26 for this procedure.
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. Remove the 1/4-20 x 1-1/2 inch socket head screws from the flanged end of
the load housing assembly, as shown in Figure 11.
3. Remove the outer conductor assembly.
4. Remove the input center conductor assembly by pulling it out of the housing.
5. Remove any remaining pieces of the resistor.
Note: Normally, in the disassembly, the outer flow tube will
remain with the load housing. Restore it to that position after inspec-
tion and cleaning if it should come out.
6. Inspect the inside of the load housing for damage.
7. Pull the inner flow tube from the water chamber.
8. Inspect carefully for broken pieces.
9. Grasp the projecting hub of the ground cap assembly firmly and pull it
straight off with a strong even force.
10. Wash all the inside portions of the three assemblies; input section, load
housing, and water chamber, thoroughly with distilled water.
11. Inspect all O-rings for damage before reassembling the load.
Installing the Resistor
1. Test the tightness of the replacement resistor by inserting it into the fit-
ting of the input center conductor assembly.
Note: The resistor should not have to be forced into the fitting, but
should be quite snug.
2. Do one of the following:
z If the fitting is loose in the fitting, press the slotted finger contacts
together slightly and try the resistor again.
Note: Continue this procedure until a snug fit is obtained.
z If the fitting is snug, proceed to Step 3.
3. Bottom the resistor in the fitting.
4. Insert the resistor, and the input center conductor assembly, into the load
housing with the resistor still in place in the fitting.
5. Secure the outer conductor assembly with the six 1/4-20 x 1-1/2 inch
socket head cap screws.
Assembling the Unit
1. Stand the load on its end with the RF input connector down.
2. Place the inner flow tube inside the resistor and lower it until it reaches
the resistor fitting.
3. Gently move and twist the inner flow tube until it seats in the bottom of
the resistor fitting.
Assembling the Front Connector
1. Remove the six screws at the front of the housing to release the conductors.
2. Change the O-Ring seal to the outer water flow tube once the inner con-
ductor has been pulled out
CAUTION
Do not attempt further disassembly of this part.