- A
The toner cartridge is defective
Why wrong: While possible, a genuine cartridge that has printed hundreds of pages is less likely to be defective; the drum is a separate component that wears over time.
- B
The primary corona wire is dirty
Why wrong: A dirty corona wire typically causes vertical streaks or poor charge, not a uniform gray background.
- C
The imaging drum is worn or damaged
A worn drum cannot hold a uniform charge, causing toner to be attracted to non-image areas, resulting in a gray background.
- D
The fuser temperature is too high
Why wrong: A high fuser temperature might cause smudging or paper curling, but not a gray background; that is a drum or charge issue.
Question 157 of 1,020
How to Fix a Gray Background on Laser Printer Output
This 220-1201 practice question tests your understanding of printers. 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's laser printer is producing pages with a gray background (toner dust) on the entire page. The toner cartridge is genuine and was recently replaced. The printer has printed several hundred pages since the change. 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.
Quick Answer
The answer is a worn or damaged imaging drum. This is the most likely cause because the drum is responsible for holding a uniform electrostatic charge that repels toner from non-printing areas; when it becomes scratched, worn, or loses its photoconductive properties, it cannot maintain that charge, allowing toner dust to scatter across the page and create a gray background. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of the laser printing process, specifically the charging and developing phases, and it often appears as a trap where test-takers blame the toner cartridge—but since the cartridge is genuine and recently replaced, the drum (which may be separate or integrated) is the next logical suspect. A high-voltage power supply failure could also cause this, but it is far less common and not a typical replaceable component for the exam. Memory tip: think of the drum as the “charge keeper”—if it’s worn, it can’t keep the charge, so toner sticks everywhere.
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
✓
The imaging drum is worn or damaged
A gray background or toner dust on laser prints is often caused by a faulty or worn imaging drum that cannot hold a proper charge, leading to toner being deposited where it shouldn't. It can also be due to a high-voltage power supply issue, but the drum is the more common replaceable component. The toner cartridge being genuine rules out compatibility issues.
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 defective
Why it's wrong here
While possible, a genuine cartridge that has printed hundreds of pages is less likely to be defective; the drum is a separate component that wears over time.
- ✗
The primary corona wire is dirty
Why it's wrong here
A dirty corona wire typically causes vertical streaks or poor charge, not a uniform gray background.
- ✓
The imaging drum is worn or damaged
Why this is correct
A worn drum cannot hold a uniform charge, causing toner to be attracted to non-image areas, resulting in a gray background.
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 fuser temperature is too high
Why it's wrong here
A high fuser temperature might cause smudging or paper curling, but not a gray background; that is a drum or charge issue.
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.
What to study next
Got this wrong? Here's your next step.
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.
- →
Printers — study guide chapter
Learn the concepts, then practise the questions
- →
Printers practice questions
Targeted practice on this topic area only
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All 220-1201 questions
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Printers — This question tests Printers — 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 worn or damaged — A gray background or toner dust on laser prints is often caused by a faulty or worn imaging drum that cannot hold a proper charge, leading to toner being deposited where it shouldn't. It can also be due to a high-voltage power supply issue, but the drum is the more common replaceable component. The toner cartridge being genuine rules out compatibility issues.
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.
About these practice questions
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Last reviewed: Jun 18, 2026
This 220-1201 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 220-1201 exam.
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