Is a chip cartridge problem, If the chip has an orange plastic top, take it out.
If not work, replace the chip or simply replace the cartridge(CB436A).
SOURCE: Hp lasejet M1120 MFp printer
There is either a problem with the reader on the printer (unlikely) or the chip on the print cartridge is bad (more likley). You may be able to push the checkmark to continue printing, but some of the HP products will not work when this error is present. Try a different cartridge to determine whether the printer or the cartridge is to blame.
SOURCE: SCANNER ERROR 20 of HP LASERJET M1120 MFP
Memory overflow error 20 Solutions for "error scanner 20" problems in HP LaserJet M1120 MFP
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