What to do if your laser printer only prints complete full black sheets

Complete black paper when printing with a laser printer, causes and solutions.
Toner cartridges troubleshooting guide:
https://www.youtube.com/watch?v=9X3C9KkPClc

For any question or suggestion leave a comment.
email: link.accessori@libero.it

other links:
http://www.emmegiricambi.it/
http://www.samsung.com/it/consumer/pc-peripherals-printer/printers-multifunction
http://store.hp.com/us/en/cat/printers
http://www.brother-usa.com/printer/#.VuQbWOZghlw
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