1.Cables Power and USB are not paired properly.
2.Your drivers are corrupted or obsolete to power the scanner.
3.You don’t clean or break the glass from your Cannon detector.
4.False Scan Parameters are chosen.
5.The code for the scanner is incompatible with the Canon model.
6.Due to infected Windows files, the canon mx490 scanner not working.
7.The multi-use scanner feeder jam problem.