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HP 85106D mm-Wave System
5-15
HP 85104A Test Set Module
Troubleshooting Procedures
Removing the Incident
or Reflected
Isolator/Mixer
Assemblies
Procedure 5
Before beginning this procedure, turn the power to the HP 85105A
mm-wave controller OFF. Disconnect the HP 85104A from the HP 85105A.
Refer to the following step references in Figure 5-11 on page 5-32.
Disassemble the test-set module using 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.
1. Disconnect the LO IN and LO OUT cables from the power divider
(Step 13).
2. Disconnect the mixer bracket from A11, or A12 mixer (incident signal
path near left-hand Step 14; reflected signal path near right-hand
Step 14).
3. Disconnect A9 or A10 isolator at the coupler interface (incident signal
path near left-hand Step 15; reflected signal path near right-hand
Step 15.)
4. Slide the isolator/mixer assembly out of the module and replace it with a
known good incident arm assembly from another test set module.
5. Reattach the isolator to the coupler. Be sure to use correct waveguide
connection techniques. Refer to Chapter 2, “Operation” of this manual.
6. Reattach the LO IN and LO OUT cables to the mixer.
7. 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).
8. Return to the troubleshooting flowchart.
9. Repeat Procedure 5 to return the A9/A11 or A10/A12 assembly to their
original module.
Summary of Contents for 85106D
Page 11: ...x HP 85106D mm Wave System ...
Page 117: ...4 24 HP 85106D mm Wave System Service and Troubleshooting Check Unratioed Power Levels ...
Page 139: ...5 22 HP 85106D mm Wave System HP 85104A Test Set Module Troubleshooting Procedures ...
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Page 238: ...B 2 HP 85106D mm Wave System Upgrade Paths ...
Page 243: ...HP 85106D mm Wave System v work surface installation 1 12 ...
Page 244: ... vi HP 85106D mm Wave System ...