Samsung SF4500 - Manual (Page 75)

3.13 Troubleshooting
3
T
roubleshooting
5. Carefully wipe the scanning glass with a soft, dry cloth.
If the glass is very dirty, first wipe it with a slightly dampened cloth, then
with a dry one. Be careful not to scratch the glass surface.
6. Replace the roller in reverse order, and then close the control panel
firmly until it clicks into place.
4. Clean the ADF rubber piece also.