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220-1201 Practice Question: A small business uses a thermal printer for…
A small business uses a thermal printer for shipping labels. Recently, the labels are printing with missing sections and uneven darkness. What is the most likely cause?
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 thermal printhead is dirty or has a dead element.
Thermal printers rely on a printhead that heats the paper. Uneven darkness and missing sections typically indicate a dirty or damaged printhead element. Cleaning the printhead with a thermal cleaning pen or isopropyl alcohol is the first step.
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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The label roll is loaded upside down.
Why it's wrong here
Thermal printers require the heat-sensitive side of the label stock to face the printhead for proper image formation. If the label roll is loaded upside down, the non-sensitive backing material will be presented to the printhead. This prevents any thermal reaction from occurring, resulting in completely blank labels rather than areas of uneven darkness or missing sections within the printed image.
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The printer's platen roller is worn.
Why it's wrong here
The platen roller in a thermal printer is a crucial component responsible for accurately gripping and advancing the label stock past the thermal printhead. A worn or damaged platen roller would primarily lead to mechanical feeding issues, such as labels skewing, jamming, or failing to advance consistently. These issues affect paper movement, not the printhead's ability to heat the paper, thus not directly causing variations in print darkness or missing elements.
- ✓
The thermal printhead is dirty or has a dead element.
Why this is correct
A thermal printhead contains an array of tiny heating elements that selectively apply heat to the thermal label stock. If these elements are dirty, accumulated debris can insulate them, preventing efficient heat transfer and resulting in faded or unprinted areas. Conversely, a 'dead' element is permanently non-functional, consistently failing to heat the paper in its specific location. Both conditions directly cause distinct missing sections, streaks, or uneven darkness in the printed output.
- ✗
The label stock is expired.
Why it's wrong here
Thermal label stock contains a chemical coating designed to react to heat. While expired thermal paper can degrade over time, often due to prolonged exposure to heat, light, or humidity, this degradation typically manifests as a general fading or discoloration of the entire printed image, or a reduced overall contrast. It does not usually cause specific, localized missing sections or uneven darkness during the initial printing process, which are characteristic of a printhead malfunction.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.