Tagged “maintenance”
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Buying a scanner second-hand: what to check
The mechanism is usually fine and the software usually isn't. Check driver availability first, wear parts second, and everything else after that.
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Scanner cleaning and consumables
The parts that touch paper are meant to wear out. Treating rollers and pads as consumables is the difference between a five-year device and a fussy one.
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Diagnosing scan defects by their shape
A line down every page, a band across one, a shadow in a corner. Each defect shape points at a different part of the machine or the paper.
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Why receipts jam, and what to do about it
Jams have causes you can read off the paper afterwards: curl, coating, wear, or something that should never have entered the feed path.