Ricoh D182 Service Training page 65

ADF Exposure Glass: No contact vs Contact
Mylar
No contact

Originals that have sticky substances on the surface may cause streaks
on the exposure glass.

To prevent these streaks, the ADF exposure glass has a mylar, which
guides the original over the glass so that it does not contact the glass.

This method has one demerit: any dust that attached to the exposure
glass will stay there and will not be swept away by originals passing
through.

However, the dust detection feature described on the next few slides can
help with this.

The machine uses the no contact type, but it can be converted to a
contact type.
Slide 65
 To convert between contact and no contact type scanning:
 Troubleshooting > Other Problems > Converting the ARDF DF3090 (D779)
to Contact Scanning
 The procedure is the same as in the MET-C1
Contact
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OR-C2 Training