374 Chapter 11
Assembly Replacement Procedures
Fans/Mid Web
Fans/Mid Web
NOTE The fans are attached to a part of the instrument known as the mid
web. It is possible to remove a fan without removing the mid web from
the instrument. The 3 fans in the instrument can be replaced
individually. It will be necessary to remove other assemblies located
near the fan to be replaced.
CAUTION Use ESD precautions when performing this replacement procedure.
Fans
Fan Removal
1. Remove the instrument top brace. Refer to the “Top Brace” removal
procedure.
2. Drop the front frame. Refer to the “Drop the Front Frame”
procedure.
3. Remove any assemblies necessary to access the rear of the midweb
where the defective fan is located. You will need to access the rivets
as shown in Figure 11-43. Refer to the removal procedures for the
power supply, the vertical board assemblies, or the RF section as
needed.
4. Unplug the appropriate fan cable from the motherboard.
5. Refer to Figure 11-43. To remove a fan, it is necessary to remove the
4 plastic rivets (1) that attach it to the mid-web (2). To do this use a
small tool such as a punch or screwdriver to push the rivet out.
6. Once the rivets are removed, the fan can be lifted from the mid web.
7. Remove the fan guard if available.
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