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There are many causes for the blank copy.
1- no toner flowing through developer.
2-drum unit may be defective( it contact points may be loosen).
3-HVT card may be faulty.
4- If print ok, the CIS losses its shading value.
5- the base of the machine may not be firm causes bad contact of HV contact points.
Is it just when printing that the screen goes blank? Does the machine function ok when copying? Does it shut down the machine when printing to it? If you could provide a few more details I can most likely help you with your issue.
What happens when you print a report? Do you get print then? If you can print reports and then you get blank copies the problem is your scanner. If you can't print or copy, then the problem is in either the drum, I would say 30 percent, or laser probably 70 percent. But we have to find out if it will print a report. Do you use the machine as a fax ? Do they print ok?