Question
A technician is troubleshooting an all-in-one laser printer that prints a vertical line when making copies and scans. When users print or receive faxes, the output from the printer is correct. Which of the following should the technician examine to determine the cause of the issue?
- A. The pickup rollers
- B. The corona wire
- C. The document feeder Correct
- D. The drum assembly
Explanation
The defect appears only when the scanner reads an original (copies and scans), while print jobs and received faxes come out clean, so the print engine is fine and the fault is in the scan path. A vertical line on copies is typically caused by debris on the document feeder's scan glass strip, which every page passes over at the same point. The drum assembly and corona wire are part of the print engine and would affect every printed page, including print jobs and faxes, and pickup rollers cause feed problems rather than lines.
