LJ pro 400 printing blank

[jake24482]

hi i am working on hp LJ pro 400 is printing blank on print and internal print as well please help if some one ran through this problem or know what causing blank printing
thanks in advance

[HP:guy]

You are looking at drum or laser. I would start with the drum.
Check to see if the transfer roller is in place.

[jake24482]

You are looking at drum or laser. I would start with the drum.
Check to see if the transfer roller is in place.

they looks fine

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[mo0651]

Did you do a stop test and see if the image is on the drum???