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My laser printer model: HP LaserJet P4014n , prints black document, the problem started after removed dust from it by blower. if any one know the resolution of this problem, please share with me.
see, the below picture for consideration
Use compressed air remove sides of the printer and blow it more make sure the printer interior is free of toner and dust.
Probably when blowing the interior of the printer remaining dust and toner are causing poor voltage contact.
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