The imaging drum is the most likely cause of both the grinding noise and vertical streaks in a laser printer. This component is a photosensitive cylinder that transfers toner to paper; when it becomes damaged or worn, it fails to rotate smoothly, producing a grinding sound, and leaves untoned vertical lines on the page because the drum surface cannot hold a uniform charge. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your ability to distinguish drum failures from other common issues like a scratched fuser roller or a dirty corona wire—both of which cause streaks but not the mechanical grinding noise. A frequent trap is confusing a damaged drum with a low toner cartridge, but toner alone won’t create a grinding sound. Remember the mnemonic: “Drum damage brings both noise and streaks—if it grinds and lines, the drum’s the sign.”
220-1101 Multifunction Devices Practice Question
This 220-1201 practice question tests your understanding of multifunction devices. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A user reports that their MFP is making a loud grinding noise when printing, and the output pages have vertical streaks. The MFP is a laser printer with a separate toner cartridge and imaging drum. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The imaging drum is damaged or worn.
Vertical streaks on laser printer output often indicate a damaged or worn imaging drum. The grinding noise suggests a mechanical issue with the drum rotation, which is a common failure point in laser MFPs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The toner cartridge is low on toner.
Why it's wrong here
Low toner typically causes faded prints, not vertical streaks or grinding noises.
✗
The fuser unit is failing.
Why it's wrong here
A failing fuser usually causes smudging or paper jams, not vertical streaks and grinding.
✓
The imaging drum is damaged or worn.
Why this is correct
A damaged drum can cause vertical streaks and grinding as it rotates unevenly, producing the reported symptoms.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The paper tray is misaligned.
Why it's wrong here
A misaligned tray would cause paper jams or skew, not vertical streaks or grinding.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Multifunction Devices — This question tests Multifunction Devices — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The imaging drum is damaged or worn. — Vertical streaks on laser printer output often indicate a damaged or worn imaging drum. The grinding noise suggests a mechanical issue with the drum rotation, which is a common failure point in laser MFPs.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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