HP 85106D, Manual

Page: 137 / 244

5-20 HP 85106D mm-Wave System
HP 85104A Test Set Module
Troubleshooting Procedures
Check LO Input to
Power Divider A6
Procedure 9
The following equipment is required to perform this procedure:
•
Power Meter HP 436A
•
Power Sensor HP 8485A
Before beginning this procedure, turn the HP 85105A mm-wave controller
power OFF. Disconnect the HP 85104A from the HP 85105A.
Refer to step references in Figure 5-11 on page 5-32.
Disassemble the test set module using the following four steps:
1. 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.
2. Remove all extensions from the HP 85104 test set modules.
3. Remove the two torx-head screws from the bottom housing. Pull the
bottom housing off.
4. Slide the front panel up and out. Cut and remove any cable ties as
needed.
5. Disconnect W7, LO cable assembly from the 90° bend of the power
divider.
6. Connect W7 to the HP 8485A power sensor.
7. Reconnect the HP 85104A to the HP 85105A. Turn the HP 85105A ON.
Read the power level displayed on the power meter. Refer to Table 5-5
for the correct power level in the band you are using.
8. Return to the troubleshooting flowchart.
Table 5-5 Power Divider LO Input Level
All Bands
> 19 dBm