Removing And Replacing The A4-A17 Boards - Keysight N5227A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A4–A17 Boards
Removing and Replacing the A4–A17 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)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• 9 mm socket or open-end wrench (torque to 21 in-lb or 2.38 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 6-6., "Top Assemblies, All Options,"
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. Instructions for A5 and A10 source boards (Refer to
a. A10 source board only: on the bottom side of the analyzer, disconnect cable W7 from the A12 board
and cable W8 from the A13 board.
b. A5 source board only: on the top side of the analyzer, disconnect the cables from the A4, A7, and A8
boards.
c. On the top side of the analyzer, remove screws at each end of the source board to be removed.
d. Lift the two extractors, one at each end of the board, and lift the board out of the chassis.
4. Instructions for A4, A7, A8, A12, A13,
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, one at each end of the board, and lift the board.
c. Before removing the board, 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. 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 Table 7-2 on page
NOTE 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
7-10
for this procedure.
"Removing the Covers" on page
Figure 6-7 on page 6-19
, A15, A16, and A17 boards:
A14
7-54.
Table 7-2 on page 7-54.
PNA Series Microwave Network Analyzers
7-6.
for cable locations):
Service Guide N5227-90001
N5227A