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Difficulty: Very hardPrinter and Multifunction Device Issues

A network technician is troubleshooting a commercial workgroup laser printer. Users report that when printing multi-page documents in duplex (double-sided) mode, a light vertical smudge and faint repetitive ghost images appear exclusively on the back side of every sheet, whereas single-sided jobs print with perfect quality. Replacing the toner cartridge assembly and cleaning the primary optical glass did not resolve the defect. Which of the following is the most likely cause of this issue?

  1. A worn or contaminated fuser pressure roller depositing residual toner during the second passAnswer
  2. B
    A damaged primary charge roller within the photosensitive drum assembly
  3. C
    A misconfigured duplex page margin offset setting within the print server driver
  4. D
    A misaligned laser scanner polygonal mirror causing optical beam reflection distortion

Answer

A worn or contaminated fuser pressure roller depositing residual toner during the second pass
The correct answer identifies a worn or contaminated fuser pressure roller as the root cause. During single-sided printing, the pressure roller only contacts the unprinted back of the paper. However, during duplex printing, page one has already received toner and is flipped over. As page two passes through the fuser, page one's printed surface presses directly against the bottom fuser pressure roller. If toner has adhered to the pressure roller due to thermal degradation or a failed cleaning pad, it leaves ghost impressions and smudges on the reverse side of duplexed sheets.

Step-by-Step Solution

1
Analyze the reported printing symptoms and environmental conditions.
Defect occurs strictly on the second side of duplexed pages, while single-sided printing is completely unaffected.
Isolates the issue to components that interact specifically during paper inversion and second-pass fusing.
2
Evaluate the electrophotographic process steps involved in duplex printing.
On single-sided jobs, toner is melted onto the top of the sheet by the hot fuser roller while the bottom pressure roller only touches clean paper. On duplex jobs, the printed side faces down against the pressure roller when passing back through the fuser.
Identifies the fuser pressure roller as the primary contact surface capable of transferring accumulated unfused toner onto the back of the second page.
3
Determine the correct component replacement step according to CompTIA troubleshooting methodology.
Replace the fuser assembly (or fuser maintenance kit) containing the pressure roller.
Resolves ghosting and smudging on the duplex pass by restoring clean, non-stick roller surfaces.

Key Concept

Laser Printer Duplexing and Fusing Assembly Troubleshooting
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Topics

Printer and Multifunction Device Issues

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