Keysight Technologies N5244/5B Service Manual page 579

Repair and Replacement Procedures
Removing and Replacing the A23 Test Set Motherboard
8. Slide the A23 test set motherboard toward the front of the instrument until
the rear panel BNC connectors are free of the rear panel, then lift the
motherboard and remove it from the analyzer.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
that pertain to this removal procedure. Refer to
Keysight N5244B/45B Service Guide
Table 7-2 on page 7-93.
7-39