7-56 Keysight N5221A/22A Service Guide
Repair and Replacement Procedures
Removing and Replacing the Fans
7-
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 “Removing the Covers” on
page 7-6.
3. Remove the front panel assembly. Refer to “Removing and Replacing the
Front Panel Assembly” on page 7-8.
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 A16 Power Supply Assembly” on page 7-23.
5. Remove five screws (item
①) that attach the fan bracket to the chassis.
6. Remove three screws (item
➁) that attach the rear panel to the fan
bracket.
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
③).
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
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 7-60.
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