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There is no default password for HP that I know of. &nbsp;I looked up a few things and found a Cold Reset is your best option. &nbsp;It will completely reset the printer (<a href="http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c00270689&jumpid=reg_R1002_USEN" rel="ugc nofollow">more information</a>)<br />
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You may have to call HP support if that doesn't work to have them help with the password reset.
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There is no default password for HP that I know of.  I looked up a few things and found a Cold Reset is your best option.  It will completely reset the printer (more information [http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c00270689&jumpid=reg_R1002_USEN])

You may have to call HP support if that doesn't work to have them help with the password reset.

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there is an administrator password set on this device which i don't know.<br />
how can i reset the password ? or remove it ?
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there is an administrator password set on this device which i don't know.
how can i reset the password ? or remove it ?

hp laserjet 400 color mfp 475dn

A peripheral device is defined as a computer device, such as a keyboard or printer, that is not part of the essential computer (i.e., the memory and microprocessor). These auxiliary devices are intended to be connected to the computer and used in conjunction with it. Examples of external peripherals include mouse, keyboard, printer, monitor, external Zip drive or scanner, while internal peripherals include CD-ROM drive, CD-R drive or internal modem. Today's new devices, such as tablets, smartphones and wearable computing devices are considered peripherals as they can be connected and used on a computer system. The difference, however, is that these devices can run independently of the computer system.