Keysight Technologies N5244/5B Service Manual page 621

Repair and Replacement Procedures
Removing and Replacing the A71–A74 Bias Tee Combiners
Replacement Procedure
Ensure that when the bias combiner semirigid cables are torqued that one
5/16 in wrench is used to stabilize the connector on the combiner and the
second wrench is used to torque the semirigid cable to 10 in-lbs.
IMPORTANT! Some figures show examples of more than one bias combiner
or bias combiner cable being remove. is It only necessary to remove the
defective bias combiner.
1. Reverse the order of the removal procedure.
2. As shown in
attenuator brackets as indicated.
3. Perform the post-repair adjustments, verifications, and performance tests
that pertain to this removal procedure. Refer to
Keysight N5244B/45B Service Guide
— Torque the bias combiner screws (x2) to the chassis to 9 in-lbs.
— Mark the bias combiner connectors with a fine permanent marker.
Refer to Figure 7-42 on page
— Remember to place the cable ground clamp on the bias tee
combiner's RF IN connector.
— Torque the cable ground clamp to bias combiner to 6 in-lbs.
— Torque the bias combiner with bracket assembly (to the chassis)
screws (x2) to 9 in-lbs.
Figure 7-39 on page
7-84.
7-82, position the bias tees on the
Table 7-2 on page 7-93.
7-81