Dell 2135cn Service Manual page 753

Chapter 3 Removal and Replacement Procedures (RRPs)
3) Attach the COUNTER BALANCE R to
the IIT ASSY SUB, fix the hook of the
COUNTER BALANCE R. Attach the ADF
ASSY to the IIT ASSY SUB.
4) Attach the RUBBER BUSH of the HARN
ASSY ADF to the rib of the ADF ASSY.
5) Engage the connector (P/JADF1) of the
HARN ASSY ADF to the PWBA.
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Version 3 2008.06.13