Keysight Technologies N5244/5B Service Manual page 591

Repair and Replacement Procedures
Removing and Replacing the A29–A32 Reference Couplers and Reference Coupler
Mounting Brackets
Removing and Replacing the A29–A32 Reference Couplers and
Reference Coupler Mounting Brackets
Tools Required
— T-6 TORX driver (set to 4 in-lb)
— T-10 TORX driver (set to 9 in-lb)
— T-20 TORX driver (set to 21 in-lb)
— 5/16 inch open-end torque wrench (set to 10 in-lb)
— ESD grounding wrist strap
Removal Procedure
Refer to
Be careful not to damage the center pins of the semirigid cables. Some
flexing of the cables is necessary to remove the assembly. However, do not
over-bend the semirigid cables.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Position the analyzer bottom side up.
4. Disconnect three semirigid cables (item
5. Remove two screws (item
6. Move the disconnected semirigid cables out of the way and lift the
7. Remove four screws that attach the reference coupler to be replaced to
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
Keysight N5244B/45B Service Guide
Figure 7-23 for this procedure.
be replaced.
coupler to be replaced.
reference coupler mounting bracket, with the reference coupler attached,
out of the analyzer. It may be necessary to loosen the connector at the
other end of some of the semirigid cables to allow them to be moved
enough.
the reference coupler mounting bracket, and remove the reference coupler
from the bracket.
Torque all RF connectors to 10 in-lbs.
that pertain to this removal procedure. Refer to
"Removing the Covers" on page

) from the reference coupler to

) from the mounting bracket of the reference
Table 7-2 on page
7-8.
7-93.
7-51