Printers: HP LaserJet M712 and M725MFP
Problem: Close left door message or re-install duplexer message on control panel:
There have been a few cases where the printer will display one of the above messages without the ability to print. The cause of this has been the rear fuser lock tab being just out of the locked position, which will intern cause the linkage to the switch “SW1 fuser/left door” incomplete.
Below are incorrect and correct positions for the rear fuser lock tab:
