Printer Repair Questions? Ask IT Technicians for Answers ASAP
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I think that the ME means 'Memory Error,' and the E means 'Error'.
That is, unfortunately, the most logically likely interpretation of their not being able to accept numbers and display them.
Do you have a manual for these? do you know how to reset them? (aside from, of course, turning them Off for several hours, which should obviously be tried.)