I had an older Minolta a couple of years ago. I'll try adapting what worked for it to this machine. Hopefully this will work.
Press the "utility" button. Then hit "admin settings". Enter a password of 12345678. Then hit "user authentication" and put in "off". Hit panel reset from the main menu.
Again, I'm not entirely sure this will work for the 420 but its worth a shot. Good luck!
Hello how do i reset the administrative password of konica minolta bizhub 420?
How utilize admin
Once in service mode do a STOP, 0, C
You should then have an option to reset admin password
The manual has these steps to reset."
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