The answer is worn duplex rollers. This is the most common cause of duplex paper jams in laser printers because duplex printing requires the paper to be flipped and re-fed through the printer’s paper path, placing extra stress on the rollers specifically responsible for that reversal. Over time, these duplex rollers lose their grip or accumulate toner dust, causing misfeeds and jams that only appear during two-sided printing. On the CompTIA A+ Core 1 220-1201 exam, this question tests your understanding of printer consumables and maintenance—a common trap is to immediately suspect the fuser or transfer roller, but the key clue is that jams occur “mostly when printing on both sides.” Remember the memory tip: “Duplex jams? Check the duplex rollers first—they do the flip, so they take the hit.”
220-1101 Printers Practice Question
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 technician is troubleshooting a laser printer that frequently jams paper. The jams occur mostly when printing on both sides (duplex). 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 duplex rollers are worn
Duplex printing requires the paper to be flipped and fed back through the printer, which involves additional rollers and a duplex unit. Worn or dirty duplex rollers are a common cause of jams during duplex operations. Cleaning or replacing these rollers often fixes the issue.
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 paper is too thick for the printer
Why it's wrong here
Thick paper can cause jams in any mode, but the problem is specific to duplex, pointing to the duplex mechanism.
✗
The fuser is overheating
Why it's wrong here
An overheating fuser causes smudging or paper curling, not specific jams during duplex printing.
✓
The duplex rollers are worn
Why this is correct
Worn duplex rollers fail to grip the paper during the flip process, causing jams only in duplex mode.
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 toner cartridge is low
Why it's wrong here
Low toner causes faded prints, not paper jams.
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.
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 duplex rollers are worn — Duplex printing requires the paper to be flipped and fed back through the printer, which involves additional rollers and a duplex unit. Worn or dirty duplex rollers are a common cause of jams during duplex operations. Cleaning or replacing these rollers often fixes the issue.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A user reports that their laser printer jams frequently, but only when printing on both sides (duplex). Single-sided printing works fine. The technician has inspected the paper and it is within specifications. What is the most likely cause of this issue?
hard
A.The paper is too thick for duplex printing.
✓ B.The duplex unit is misaligned or has a mechanical fault.
C.The fuser roller is worn out.
D.The printer driver is set to 'duplex' incorrectly.
Why B: Duplex jams often occur because the duplex unit (the mechanism that flips the paper) is misaligned or has a broken gear. Single-sided printing bypasses this unit, so it works fine. Other causes like paper path rollers or fuser issues would typically affect both simplex and duplex printing.
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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.
Question Discussion
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