Avision AV320 (FT-0604H) - Manual (Page 76)

User’s Manual
6.2 Cleaning the Calibration Area
1. Press the ADF Release button. Open the front cover to the
left.
2. Wet a clean lintless cloth with some isopropyl alcohol.
(95%)
3. Wipe the glass and the white area as illustrated in below
from side to side to rid the dust or dirt.
Calibration
Area
Glass
6-3