It is crosser or relay fault, due to long time of manufacturing the fomic of relay, melted, and disturb the timing of printer, you will find it, inside of printer near scan beam assembly, right side, use heavy grammage tap in replace of malted foam
Http://h30499.www3.hp.com/t5/Printers-LaserJet/HP-2840-prints-blank-pages-or-yellow-only/td-p/2326639#.Ur1kMH_lMgU
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The printer produces the page but produces a blank page.Drum and cartriges are all good.
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