Keysight Technologies N5244/5B Service Manual page 562

Repair and Replacement Procedures
Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers
prefixed MY/SG/US5150 and below)
If any N5230-60002 13.5 GHz Synthesizer board in your PNA is replaced
with the RoHS compliant N5240-60076 board, you must replace ALL of the
other N5230-60002 boards. To help lower the price for customers who
must replace three synthesizer boards in their PNA-X, Keysight provides
kit N5242-60168 - containing three N5240-60076 boards - at a
discounted price. Any spare boards may be retained for future repairs. You
must also upgrade your PNA firmware to rev A09.33xx or above. Download
PNA firmware at
https://www.keysight.com/us/en/product/N5245B/pna-x-microwave-net
work-analyzer-900-hz-10-mhz-50-ghz.html.
The A4, A15, and A17 synthesizer boards will not perform correctly and
will cause the PNA to display errors until the Synthesizer Bandwidth
Adjustment and the EE Default Adjustment are completed, as per
7-2 on page
7-22
7-93.
Keysight N5244B/45B Service Guide
Table