The most likely reason why a scanner is not scanning or printing properly is due to a lack of maintenance. This could be caused by the following:
1. Not having enough ink or toner in the printer. It is important to regularly check the levels and replace them as necessary.
2. Not cleaning the printer rollers or the paper feed tray. Regularly brushing out dust, dirt and other debris can help improve the performance of the machine.
3. Poor quality paper or cartridges. Using high-quality products from reliable manufacturers can ensure that your documents come out clear and crisp.
4. A clogged print head. This can happen if too much ink or ink residue has built up over time. Regularly cleaning the print head can help ensure the printer is working properly.
5. A faulty scanner head or sensor. This can cause prints to be streaked or blurred if the problem is not addressed.
6. Faulty cables or connections. The electrical connections between the scanner and the computer can become loose or broken if not checked regularly.
In addition to these issues, it is important to make sure the printer is regularly serviced. Doing so can help ensure that the machine is working correctly and producing the desired results.