From HP.com - he printer is experiencing a critical printing error. Unplug the printer for five minutes, and then plug it back in. If the error persists, contact HP customer service at the number provided on the support flyer included with the printer, or visit http://www.hp.com .
SOURCE: HP 3015 Laserjet paper jam error message
The paper is probably jammed between the fuser and the rear cover if you can't see it.
SOURCE: hp laserjet m1522nf 52 scanner error
Step 1.Switch on the machine observe Optical scanner assm moving forward & reverse for checking home position? remove flat bed glass,clean it especially at black band area, fix it and check..Step 2. Switch off the machine, remove power cable, remove left side door,dis connect Scanner cable(connector J4) on formatter, switch on the machine, check if same error? replace formatter assm..if different error replace optical scanner(CCD) assm..
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