If scanner is not working but printer is working, follow these instructions i.e. update driver, restart Windows service, etc.
Power supply issues are the main cause of this problem. If your computer or printer is not directly connected to the main power source, say they are connected through a UPS, the UPS might be faulty.
Printers have a knack for breaking at the worst possible time. Luckily, many of the most common problems are things you can actually sort out yourself.
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