Keysight Technologies N5244/5B Service Manual page 561

Repair and Replacement Procedures
Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers
prefixed MY/SG/US5150 and below)
2. Remove the outer and inner covers. Refer to
page
3. A5 and A10 source boards:
4. A4, A7, A8, A9, A12, A13, A14, A15, A16, and A17 boards:
Replacement Procedure
1. Reverse the order of the removal procedure.
Remember to connect any necessary cables to the bottom of the board
before reinstalling it. If replacing a doubler board, make sure the new
board has loads connected to the same ports as were used on the old
board. This may require moving a load from the old board to the new board
or removing the load from the new board.
When replacing the A5 or A10 source board, remove the semirigid cables
attached to the bottom of the old board and attach them to the bottom of
the new board. Be sure to orient these cables the same as they were on
the old board.
2. Perform the post-repair adjustments, verifications, and performance tests
that pertain to this removal procedure. Refer to
IMPORTANT! For the A9 noise receiver board, verify N5245-60124
EEPROM headers read revision: "B". If "A", then edit EEPROM headers to
read "B". For more information, refer to the Keysight 2-Port/4-Port N524xA
to N524xB and N5264A to N5264B Model PNA-X Upgrade Kit Installation
Note, available online at
https://www.keysight.com/us/en/assets/9018-04550/installation-guides
/9018-04550.pdf.
Keysight N5244B/45B Service Guide
7-8.
a. A10 source board only: on the bottom side of the analyzer,
disconnect the cables from the A12 and A13 boards (item
b. A5 source board only: on the top side of the analyzer, disconnect all
visible semirigid cables from the A4, A7, and A8 boards.
c. On the top side of the analyzer, remove two screws (item
each end of the board, from the source board to be removed.
d. Lift the two extractors (item
Adjust the slack in the gray flexible cable as needed to move it out
of the way, and lift the board out of the chassis.
a. Remove all cables connected to the top of the board to be removed.
Note the location of each cable for reinstallation.
b. Lift the two extractors (item
lift the board.
c. Before removing the board, check the bottom of the board for any
attached cables.
"Removing the Covers" on

), one at each end of the board.

), one at each end of the board, and
Table 7-2 on page

).

), one at
7-93.
7-21