Removing And Replacing The A4-A17 Boards - Keysight N5224A 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
Figure 7-6
Refer to for this procedure.
NOTE
Any cables that are removed should be labeled for reinstallation later.
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 top side of the analyzer, disconnect all visible semirigid cables from the A10, A12, and A13
①
).
(item
boards
b.
A
5 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
removed.
d.
Lift the two extractors (item
the way, and lift the board out of the chassis.
4.
A7, A8, A12, A13 boards: on the bottom side of the analyzer, disconnect cables
5.
A4, A7, A8, A12, A13, A14, A15, A16, and A17 boards:
a.
Remove all cables connected to the top of the board to be removed. Note the location of each cable for reinstallation.
b. (item
Remove two screws
screws).
c.
Lift the two extractors
d.
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
7-2 on page 7-56
.
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
page 7-56.
7-14
"Removing the Covers" on page
(item
③
),
one at each end of the board. Adjust the slack in the gray flexible cable to move it out of
➁
),
one at each end of the board, from the board to be removed (Exception: A14 does not have
③
(item ),
one at each end of the board, and lift the board.
PNA Series Microwave Network Analyzers
7-6.
➁
),
one at each end of the board, from the source board to be
①
(item )
from the cable brackets.
N5224A and N5225A
Table
Table 7-2 on
Service Guide N5225-90001