220-1101 Hardware and Network Troubleshooting Practice Question
A technician is troubleshooting a laser printer that produces pages where the toner smudges easily and can be wiped off with a finger. The technician has already replaced the toner cartridge with a new OEM cartridge, but the problem persists. Which of the following printer components is MOST likely causing this issue?
⚠ Common exam trap
A common mix-up: candidates assume a toner smudge issue is always caused by a defective toner cartridge, but the CompTIA 220-1101 exam expects you to recognize that a faulty fuser assembly is the root cause when the problem persists after cartridge replacement.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Fuser assembly
The fuser assembly is responsible for melting toner particles into the paper fibers using heat and pressure. If the fuser is not reaching the correct temperature or is malfunctioning, the toner will not be permanently bonded to the page, causing it to smudge or wipe off easily. Since replacing the toner cartridge did not resolve the issue, the fuser is the most likely culprit.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Transfer roller
Why it's wrong here
The transfer roller applies a positive charge to the paper so that negatively charged toner particles are pulled off the photosensitive drum onto the sheet. If the roller is worn or receives incorrect bias, the symptom is typically a lighter, grainy, or patchy image with areas where toner never transferred—not smudging. Because smudging results from toner that is present but not fused, a transfer roller failure cannot make fused toner smear; the toner adhesion problem must lie downstream in the fusing stage.
- ✓
Fuser assembly
Why this is correct
The fuser assembly is the correct answer because it performs the final step in the laser printing process: applying around 180°C of heat and 40–70 psi of pressure to compact and melt the toner particles into the paper fibers. If the fuser's heating element burns out, the thermistor drifts, or the pressure roller loses its spring tension, the toner remains as a loose dry powder loosely sitting on the surface. Any rubbing or folding of the page immediately transfers the unfused toner away, producing visible smudges. This precise failure mode is what makes a non-heating fuser the classic cause of smearing after printing.
- ✗
Pickup rollers
Why it's wrong here
Pickup rollers are mechanical rubber components whose sole job is to grip the top sheet in the input tray and advance it into the paper path, using friction to separate one sheet from the stack. When they become glazed, cracked, or covered with paper dust, they lose traction, which usually manifests as repeated paper jams, misfeeds, or multi-sheet feeds. Even a completely seized pickup roller cannot affect the chemical or thermal bond between already-printed toner and paper because the feed mechanism is entirely upstream of the imaging and fusing systems. Therefore a misbehaving pickup roller produces feeding faults, not post-print smudging.
When this WOULD be correct
Pickup rollers would be the correct answer if the symptom were paper jams, misfeeds, or multiple pages feeding at once, especially after replacing the toner cartridge.
- ✗
Corona wire
Why it's wrong here
In a laser printer, the corona wire (or primary charge roller in newer designs) applies a uniform negative electrostatic charge to the OPC drum's surface before the laser writes the latent image. If the corona wire is dirty, kinked, or weakened by ozone buildup, charging becomes uneven, leading to faded background, random black streaks, vertical lines, or voids in the printed character patterns. These visible defects are all formed during the exposure/development phase, before the toner ever reaches the paper. Since smearing occurs after toner deposition and is a failure of the thermal melt process, a defective corona wire explains image-quality artifacts but cannot cause toner to smudge after the page exits.
When this WOULD be correct
A technician is troubleshooting a laser printer that produces faint or blank pages, and the toner cartridge has been replaced. In that scenario, a dirty or faulty corona wire would be the most likely cause.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.
✓Fuser assemblyCorrect answer▾
Why this is correct
The fuser assembly is the correct answer because it performs the final step in the laser printing process: applying around 180°C of heat and 40–70 psi of pressure to compact and melt the toner particles into the paper fibers. If the fuser's heating element burns out, the thermistor drifts, or the pressure roller loses its spring tension, the toner remains as a loose dry powder loosely sitting on the surface. Any rubbing or folding of the page immediately transfers the unfused toner away, producing visible smudges. This precise failure mode is what makes a non-heating fuser the classic cause of smearing after printing.
✗Pickup rollersWrong answer — click to see why▾
Why this is wrong here
Pickup rollers are responsible for feeding paper into the printer, not for fusing toner onto the page. Smudging toner indicates a fusing issue, not a paper feed problem.
★ When this WOULD be the correct answer
Pickup rollers would be the correct answer if the symptom were paper jams, misfeeds, or multiple pages feeding at once, especially after replacing the toner cartridge.
Why candidates choose this
Candidates may confuse pickup rollers with the fuser because both are wear items, or they might think toner smudging is related to paper handling issues.
✗Corona wireWrong answer — click to see why▾
Why this is wrong here
Corona wire issues cause faint or blank pages, not smudging. Smudging that can be wiped off indicates the toner is not fused to the paper, which is a fuser assembly problem.
★ When this WOULD be the correct answer
A technician is troubleshooting a laser printer that produces faint or blank pages, and the toner cartridge has been replaced. In that scenario, a dirty or faulty corona wire would be the most likely cause.
Why candidates choose this
Candidates may confuse corona wire function with toner adhesion, or they might think any print quality issue after cartridge replacement points to the corona wire.
Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1101 exam.