Removing And Replacing The A4-A17 Boards (For Analyzers With Serial Numbers Prefixed My/Sg/Us5150 And Below); Removing And Replacing The A4-A17 Boards - Keysight N5244A Service Manual

Repair and Replacement Procedures
Removing and Replacing the A4–A17 Boards (For analyzers with serial numbers
prefixed MY/SG/US5150 and below)
Removing and Replacing the A4–A17 Boards
(For analyzers with serial numbers prefixed MY/SG/US5150 and
below)
In February 2012, the N5241A and N5242A analyzers underwent
significant hardware changes. These changes included a redesigned
Signal Processing ADC Module (SPAM) board, 13.5 GHz (source 1, source
2, and LO) synthesizer board, inner cover (retaining shield), left side inner
bracket, right side inner bracket, chassis base, and test set deck. It is very
important that this redesigned hardware be used only with analyzer serial
numbers prefixed MY/SG/US5201 and above. If you have an analyzer
whose serial number is prefixed MY/SG/US5150 and below, you must use
the previous version of hardware rather than the redesigned hardware -
refer to
Be very careful to use the appropriate hardware in your analyzer. Using the
wrong hardware can ruin analyzer components, resulting in additional
customer costs.
Tools Required
— T-10 TORX driver (set to 9 in-lb)
— T-20 TORX driver (set to 21 in-lb)
— 5/16 inch open-end torque wrench (set to 10 in-lb)
— 9 mm socket or open-end wrench (set to 21 in-lb)
— ESD grounding wrist strap
Removal Procedure
Refer to
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. A5 and A10 source boards:
4. A4, A7, A8, A9, A12, A13, A14, A15, A16, and A17 boards:
Keysight N5244A/45A Service Guide
"Top Assemblies and Cables, All Options" on page
Figure 7-6
for this procedure.
page 7-7.
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.
"Removing the Covers" on
③
), one at each end of the board.
6-17.
①
).
➁
), one at
7-15