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5-12
HP 85106D mm-Wave System
HP 85104A Test Set Module
Troubleshooting Procedures
Switching Isolators
(A7, A9, or A10)
Procedure 2
Before beginning this procedure, turn the power to the HP 85105A
mm-wave controller OFF. Disconnect the cables from the HP 85104A to the
HP 85105A.
Refer to the step references in Figure 5-11 on page 5-32.
1. Disassemble the test-set module beginning with the following four
steps:
a.
Invert the test set module so that the bottom side is facing up.
Remove the stand by loosening the two captive screws until the
module and stand are disengaged.
b.
Remove all extensions from the HP 85104 test set modules.
c.
Remove the two torx-head screws from the bottom housing. Pull
the bottom housing off.
d. Slide the front panel up and out. Cut and remove any cable ties as
needed.
2. Disconnect the suspect isolator (Step 15) at the coupler interface and at
the mixer interface.
3. Loosen the four mixer-bracket screws (Step 14) and slide the isolator out
of the assembly.
4. Replace the suspect isolator with a known good isolator (possibly from
the other test set module). Be sure to use correct waveguide connection
techniques (refer to “Waveguide Connections” on page 2-9 for
connection procedures).
NOTE
You must exchange the suspect isolator with an isolator from the same
auxiliary arm position.
5. Reconnect the cables from the HP 85104A to the HP 85105A. Turn
the HP 85105A ON. Recheck the unratioed power levels (refer to
“Procedure 1” on page 5-11).
6. Return to the troubleshooting flowchart.
Содержание 85106D
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Страница 149: ...5 36 HP 85106D mm Wave System HP 85104A Test Set Module Assembly Procedure Figure 5 12 HP 85104A Assembly Procedure ...
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