Replacing the Transformer
4-90 72A-1230 Rev. F
July 22, 2005
12. Replace the cover of the Main Reference Assembly and secure it by
replacing the screws using a Phillips-head screwdriver.
Notice that there is a blue grommet attached to the cable that connects to
the Guard Mode Switch Board. When replacing the screw that secures this
cable, set the blue grommet into the notch on the Main Reference
Assembly cover.
13. Replace the Transformer cover and white grommets.
• Replace the five screws near the top, inside edge of the card cage using
a 15” Phillips-head screwdriver.
• Replace the five screws on the outside of the instrument next to the fan
using a Phillips-head screwdriver.
• Replace four screws and washers on the top of the Transformer cover
using a flat-blade screwdriver.
14. Replace the card cage cover by reversing the steps in ”Removing the Card
Cage Cover” on page 4-48.
15. Replace the top and front covers by reversing the steps in ”Removing the
Front and Top Covers” on page 4-46.
16. Check for Guard-to-Ground Insulation, as described in ”Checking M4100
Guard-to-Ground Insulation” on page 4-43.
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