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Horizontal grey banding on prints from the B&W LaserJet Pro M402dn #1164
The network-attached B&W laser printer started printing poorly over the weekend:
I tried printing the printer’s in-built Cleaning Page, twice, and it made no difference.
The printer reports that its black toner cartridge is about 45% full.
Things we could try next, sourced from a quick browse of the web: