A user reports that every page from a laser printer shows a vertical stripe along one edge that is completely blank-no toner is deposited in that band. The toner/drum cartridge has already been replaced and no paper jams are present. Which printer component most likely requires cleaning or replacement to restore print quality?
A consistent blank (white) vertical stripe indicates that toner is never transferred to that part of the paper. In the laser-printing process the transfer corona wire (or its modern equivalent, the transfer roller) places a strong positive charge on the paper so the negatively charged toner leaves the drum and sticks to the page. If part of this corona/roller is dirty or damaged, that strip of paper receives no charge, toner stays on the drum, and the page emerges with an unprinted vertical band.
Fuser assembly - would allow toner onto the paper but fail to bond it; the symptom would be smearing, not an empty stripe.
Toner cartridge - already replaced, so the drum and developer are unlikely to be the cause.
Primary charge roller - charges the drum, and problems here usually create black lines or overall faint output, not a clean white stripe.
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What role does the charge roller play in the printing process?
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Can you explain the function of the coronal wire?
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How can I troubleshoot if the charge roller or coronal wire is faulty?