Removing And Replacing The A4-A13 Boards - Keysight N5221A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A4–A13 Boards
Removing and Replacing the A4–A13 Boards
Tools Required
• T-10 TORX driver (torque to 9 in-lb or 1.02 N.m)
• T-20 TORX driver (torque to 21 in-lb or 2.38 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-6 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. A5 and A10 source boards:
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
other boards.
c. On the top side of the analyzer, remove two screws (item
source board to be removed.
d. Lift the two extractors (item
cable as needed to move it out of the way, and lift the board out of the chassis.
4. A4, A10, A11, A12, and A13 boards:
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
c. Before removing the board completely, check the bottom of the board for any attached cables.
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.
When replacing the A5 or A8 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 Table 7-2 on page
NOTE The A4, A11, and A13 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
7-14
"Removing the Covers" on page
①
).
③
), one at each end of the board. Adjust the slack in the gray flexible
③
), one at each end of the board, and lift the board.
7-56.
Table 7-2 on page
PNA Series Microwave Network Analyzers
➁
), one at each end of the board, from the
7-56.
N5221A/22A
7-6.
Service Guide N5222-90001