220-1201 Practice Question: That their laser printer is producing pages with…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

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  Fuser assembly

  Why it's wrong here

  The fuser assembly's primary function is to permanently bond the toner to the paper using intense heat and pressure. A malfunction in this unit, such as a damaged heating element or pressure roller, typically results in toner smudging, ghosting, or toner that easily flakes off the page because it hasn't been properly fused. While it can also cause paper jams, it does not create consistent vertical streaks, as those defects originate earlier in the image formation process.

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  Toner cartridge

  Why it's wrong here

  A toner cartridge primarily supplies the toner powder used for printing. If the cartridge itself is defective or leaking, it might release toner randomly, causing scattered spots, splotches, or a generally dirty background on the printout. However, the toner cartridge, separate from the integrated drum unit in some designs, does not typically cause consistent, repeating vertical streaks, as these are usually indicative of a physical defect on the imaging drum's surface.

• ✓

  Drum unit

  Why this is correct

  The drum unit, or photoconductive drum, is the central component responsible for forming the electrostatic image and attracting toner. If the delicate photosensitive surface of the drum is scratched, worn, or has a foreign particle adhering to it, that specific defect will consistently pick up or repel toner in the same location during each rotation. This consistent defect is then transferred to the paper, manifesting as a persistent vertical streak or line down every printed page.

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  Pickup roller

  Why it's wrong here

  Pickup rollers are mechanical components designed to reliably feed individual sheets of paper from the paper tray into the printer's internal path. When these rollers become worn, dirty, or lose their friction, they fail to grip the paper effectively, leading to common paper feed issues such as jams, misfeeds, or multiple sheets being pulled simultaneously. Since their function is solely paper handling, they do not directly influence the toner application or image creation process, and therefore cannot cause print quality defects like vertical streaks.

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