Lexmark T640 Service Manual page 250

4061-xx0
Installation
1.
Move the fuser exit sensor flag out of the way to clip the sensor securely into the cover.
2.
Connect the fuser exit sensor cable.
3.
Snap the bottom fastener of the sensor cover into place in the lower exit guide, and use a small flat bladed
screwdriver to ease the sensor cover into the clips.
4.
Replace the screw securing the sensor cover.
Note: Make sure the flag moves properly.
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Service Manual