Removal and Installation Procedures
TDS 420A, TDS 430A & TDS 460A Service Manual
6-63
1. Access the module: Be sure you have performed the Access Pr ocedure on
page 6--13 and removed the modules as instructed.
2. Assemble equipment and locate modules to be removed: Locate the modules
to be removed in the locator diagram Internal Modules, Figure 6--3,
page 6--19.
3. Orient the digitizing oscilloscope: Set the digitizing oscilloscope so that its
bottom is down and its rear is facing you.
4. Remove the fan:
a. Unplug the power cable for the fan from J3 on the Auxiliary Power
Supply.
b. Release the two flex locks securing the top of the fan to the fan mount,
then lift the fan out from the top of the chassis.
c. When reinstalling the fan, be sure the two locks snap into place to secure
the fan.
STOP. DO NOT do step 5 unless servicing a broken fan mount or removing that
mount for cleaning.
5. Remove the fan mount:
a. Rotate the digitizing oscilloscope so the side that houses the fan mount
is facing upwards.
b. Depress the two flex locks to release them (see Figure 6-21).
c. While holding the flex locks released, slide the fan mount so its four
retainer lugs slide from their small retainer holes in the chassis into their
large release holes.
d. Move the fan mount inward so its retainer lugs are out of the large
retainer holes and lift it out of the chassis to remove.
Fan and Fan Mount
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