All pages come out blank & printer will jam as paper is coming out of fuser. I did a diag on sensors. The registration sensor & paper exit sensor showed good on diag screen. This screen has three 0's one for each sensor. I could not get the third 0 to switch to 1. Not sure which sensor activates this 0. I have changed cartridge. Check cartridge contact springs. Also replaced hvps, and checked to make sure laser blocking plate was working properly. Any ideas? Thanks.
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