Keysight N5227B Service Guide 7-63
Repair and Replacement Procedures
Removing and Replacing the A71–A74 Bias Tee Combiners
8.
Repeat steps
through
for the other bias combiners.
Replacement Procedure
1.
Reverse the order of the removal procedure.
—
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
.
—
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.
2.
As shown in
, position the bias tees on the
attenuator brackets as indicated.
3.
Perform the post-repair adjustments, verifications, and performance tests
that pertain to this removal procedure. Refer to
.
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. It is only necessary to remove the
defective bias combiner.
