Removing And Replacing The Fans - Keysight N5221A Service Manual

Repair and Replacement Procedures

Removing and Replacing the Fans

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 7-26 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to
3. Remove the front panel assembly. Refer to
7-8.
4. Remove the power supply bracket. It is not necessary to remove the entire power supply, just the power
supply bracket. Refer to
5. Remove five screws (item
6. Remove three screws (item
7. Raise the fan bracket out of the analyzer just enough to access the fan cables. Disconnect the fan cables
from the A14 system motherboard connectors (item
8. Remove the fan bracket 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
c. Pull out the rivet completely (as shown by (item
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
7-52
"Removing the Covers" on page
"Removing and Replacing the Front Panel Assembly" on page
"Removing and Replacing the A16 Power Supply Assembly" on page
①
) that attach the fan bracket to the chassis.
➁
) that attach the rear panel to the fan bracket.
7-56.
PNA Series Microwave Network Analyzers
③
).
④
) in the illustration.
⑤
) in the illustration) to release the fan and fan
N5221A/22A
7-6.
7-20.
Service Guide N5222-90001