M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 4-75
July 22, 2005
5. Remove six screws, along with internal lock washers and flat washers,
using a flat-blade screwdriver. These screws are located on the perimeter
of the board (Figure 4.38).
6. With your fingers on the edges of the board, lift the board slightly, tilt it
back, then lift it straight up and out. (Tilting the board avoids contact with
screws inside the Main Reference Assembly).
7. Remove the replacement Main Reference Assembly from its anti-static
bag and, with your fingers on the edge of the board, place it in the
instrument by reversing the process in Step 6. Tilt the board initially to
avoid contact with any screws, then turn it and place it flat on the bottom
of the assembly.
8. Replace six screws, with internal lock washers and flat washers, using a
flat-blade screwdriver. These screws are located on the perimeter of the
board.
9. Replace the screws (two or three depending on your instrument), one in
each front corner of the Main Reference Assembly, using a Phillips-head
screwdriver.
10. Connect the W12 ribbon cable.
11. Replace the cover of the Main Reference Assembly by replacing the two
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.
12. Replace the Front Panel Assembly by following steps 9-14, ”Removing
and Replacing the Front Panel Assembly” on page 4-58.
13. Replace the top and front covers by reversing the steps in ”Removing the
Front and Top Covers” on page 4-46.
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