HP LaserJet 9000 Printer series - Manual (Page 85)

6 Product maintenance 85
Cleaning the product
5 Locate the white, vinyl calibration strips.
6 Clean the ADF backing and the calibration strips by wiping them with a clean,
damp, lint-free cloth. Use an ammonia-based surface cleaner to dampen the
cloth.
7 Close the ADF.
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