Lexmark T430 Service Manual page 190

4048-1xx
3. Support the left side with the left hand while separating the left
hinge.
Note: There is a loaded compression spring (A) on the left side
and under the metal plate. Note the location before removing
the spring.
4. Rotate the metal plate until you can access the sensor (B).
5. Push the latches underneath the sensor and housing and
disconnect the cable to the sensor.
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Service Manual