HP 3150 EN - Manual (Page 103)

EN Document scanner assemblies 101
4 Remove the screw (callout 1) from one of the small printed circuit
boards.
5 On all HP LaserJet 3150 products and on some HP LaserJet
3100 products, there is an additional screw (callout 2) to remove.
6 Release two (2) cables (callout 3) from their connectors, one on
each of the small printed circuit boards.
Figure 29. Upper guide assembly removal (2 of 2)
To reinstall
Make sure that the assembly is inserted correctly into the three
notches.
2
2
1
3
2 2