Video Guide for Disassembly and Assembly This document demonstrates how to clean the equipment that is crucial for the efficiency of scanning tasks and the quality of the resulting image files for an A4 document scanner with dual systems in a single device. Avision AD340GF This model features both an ADF (Automatic Document Feeder) and a flatbed system installed in a single unit. The demonstration includes cleaning of key components such as the friction roller, ADF roller, ADF front glass, ADF rear glass, and flatbed glass.