Keysight N5221A/22A Service Guide 7-25
Repair and Replacement Procedures
Removing and Replacing the A17 CPU Board Assembly
Removing and Replacing the A17 CPU Board Assembly
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 7-10 for this procedure.
1. Disconnect the power cord.
2. It is not necessary to remove the instrument cover(s) to remove the A17
CPU board assembly.
3. Remove six screws (item
①) from the A17 CPU board assembly; four from
the CPU assembly rear panel and two from the ejector handles.
4. Grasp the two ejector handles and rotate them outward toward the sides
of the analyzer as shown in the illustration. This will disengage the A17
CPU board assembly from the A15 midplane board.
5. Slide the A17 CPU board assembly out the rear of the analyzer.
6. If the older 1.6 GHz CPU board is being replaced with the new 2.0 GHz
CPU board, a new A51 solid state drive assembly must also be installed.
Refer to “Removing and Replacing the A51 Solid State Drive (SSD)” on
page 7-50.
If the N5221/22A already had a 2.0 GHz CPU board installed, remove the
A51 solid state drive assembly from the old CPU board and install it in the
new CPU board. Refer to “Removing and Replacing the A51 Solid State
Drive (SSD)” on page 7-50.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
that pertain to this removal procedure. Refer to Table 7-2 on page 7-60.
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