Solution for HP Photosmart 7520 printer Common error message

The common errors displayed on the HP Photosmart 7520 printer are cartridge error, paper jam error, USB scanner connection error, paper mismatch error, Scanner failure error, etc. The main parameter to be checked in case of connectivity/offline error is the connection between the printer and computer, and the status of installed printer driver. To avoid paper mismatch error, load only the paper compatible with the printer, and avoid inserting wrinkled paper as it may lead to either a paper jam or print quality deterioration. For certain issues, an alpha-numeric error message is displayed on the control panel without any information on the cause for the issue. The following are examples of error codes: 
B069a414
B3000008
B8000094
B800017
B3ffxxxx

Step 1: Resetting the printer may help to clear error messages, but only in some cases. Carryout the steps are given below to reset your printer. To know how to troubleshoot various printer issues, visit our website.
Step 4: Turn on the printer, and unplug any USB cable from the printer.
Step 5: Remove the ink cartridges, and disconnect the power cord from the printer while the printer is turned ON.
Step 6: Plug-in the power cord again after at least 60 seconds, and turn on the printer manually if it fails to power up automatically.
Step 7: Reinsert the ink cartridges, reconnect the USB cable, and print a calibration page if prompted.
Step 8: Try to print.
Step 9: If the error message appears again, service your printer. To Get Instant Support Call our Toll Free 1-866-293-9220 or Visit 123.hp.com