Keysight N5227A - Removing and Replacing the Fans

7-50 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the Fans N5227A
Removing and Replacing the Fans
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)
• Pozidriv screw driver
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-21 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to “Removing the Covers” on page 7-6.
3. Remove the front panel assembly. Refer to “Removing and Replacing the Front Panel Assembly” on page
7-7.
4. Remove the power supply bracket. It is not necessary to remove the entire power supply, just the power
supply bracket. Refer to “Removing and Replacing the A20 Power Supply Assembly” on page 7-16.
5. Remove screws (item
①
) (five on the right side and seven on the left side) that attach the fan brackets to
the chassis.
6. Remove three screws (item
➁) on both sides that attach the rear panel to the fan bracket.
7. Raise the fan bracket out of both sides in the analyzer just enough to access the fan cables. Disconnect
the fan cables from the A18 system motherboard connectors (item
③
).
8. Remove the fan brackets and fans from the analyzer.
9. To remove a fan or fan guard from the fan bracket:
a. Before removing a fan or fan guard, note the orientation of each fan and fan guard for reinstallation.
b. Pull up the center pin of each of the fan rivets as shown by (item
④
) in the illustration.
c. Pull out the rivet completely (as shown by (item
⑤
) in the illustration) to release the fan and fan
guard.
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 7-54.