Turn the product off.
Turn the product on, and while it is initializing press and hold both control-panel buttons at the same time until all the lights blink in unison.
HP LaserJet Pro P1566 and P1606dn Printers - Restoring the Factory Default Settings
Restore factory settings
To restore the product to the factory-default settings, follow these steps.
Prefer to troubleshoot on your own?
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