Avision AV186+ (FL-0912S) - Manual (Page 101)

User’s Manual
8.2 Cleaning the Calibration Area
1. Press the Paper Jam Clearing button. Open the front door
to the left.
2. Wet a cotton swab with some isopropyl alcohol. (95%)
3. Wipe the glass and the white area as illustrated in below by
moving the swab from side to side to rid the dust or dirt.
Glass
8-3