Error Code: 12 Printer Open

Printer Error - 12 Printer Open
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Error Message: 12 Printer Open

HP Error Code		12 Printer Open
Printers Affected		II, IID, III, IIID, IIISI, 4, 4M, 4Plus, 4Mplus, 4Si, 4Si MX
Description		The printer's top cover is not correctly closed, or the toner cartridge is not correctly installed. Verify the toner cartridge is fully seated and close the printer firmly. Plugging a 220V model printer into a 120V power source can also result in this message. If this message persists, a repair may be required.