Why can't the copier detect the original size? How to deal with it?

There is also a small pit in the direction outside the automatic document feeder, and there is also a document sensor inside. There is too much dust to recognize.

Related instructions

First of all, make sure that the copier works in a clean environment, away from dust and water, and don't put too heavy items on the upper board of the copier.

Secondly, we should be careful not to let coins, paper clips or thumbtacks fall into the copier, so as to avoid these metals touching the working circuit board, which will lead to short circuit of electronic components inside the copier and damage the copier.

Third, the power supply of the copier must be cut off before operation, whether it is plugging and unplugging the power supply, cables or troubleshooting the paper jam. If operated by electricity, the life of the copier will be shortened unconsciously.

Fourth, when cleaning the copier, please don't use chemical solvents or hard wet cloth to clean the dust, scraps of paper and stains inside the copier, and don't use paper products such as facial tissues to clean the inside of the copier, so as not to leave scraps of paper in the copier.