Dell 2135cn Service Manual page 565

Chapter 3 Removal and Replacement Procedures (RRPs)
20) Disengage the connector (P/J261) of
the color mode sensor on the DRIVE
ASSY PH, release the HARN ASSY KSNR
REGCL (PL10.8.9) from the hook of the
DRIVE ASSY PH.
21) Remove the GEAR P2 (PL7.1.3) from
the shaft of the DRIVE ASSY SUB
(PL7.1.1).
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Version 1 2008.02.01