Dell 2135cn Service Manual page 517

Chapter 3 Removal and Replacement Procedures (RRPs)
6) Release the three hooks that fix the
SENSOR PHOTO: SSI NO PAPER
(PL3.2.13) to the BRACKET SNS, and
remove the SENSOR PHOTO: SSI NO
PAPER.
7) Disengage the connector (P/J233) of
the SENSOR PHOTO: SSI NO PAPER.
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Version 1 2008.02.01