Well i dont know the default password but i know a way to remove it you can try this its a cold reset to the printer.
Select this link "http://rapidshare.com/files/421678273/336180.pdf" to download this file and follow the instructions to cold reset the printer to remove the password.
By default an HP printer does not have an administrator password installed. if the printer asks for a password, this means that someone has installed it and only that person knows the password.
I want this printer admin id and password
SOURCE: wat is the default password of HP laserjet 2420n
According to the manual at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00250782/c00250782.pdf the default is that there is no password, and pressing "Enter" will allow you to log in. See the manual at that link for further detail.
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