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220-1201 Practice Question: A technician is installing a new thermal printer…
A technician is installing a new thermal printer for a retail point-of-sale system. After connecting the printer and installing the driver, the printer prints garbled characters and random symbols. 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 printer driver is incorrect for the model
Garbled characters or random symbols often indicate a driver mismatch or incorrect printer language setting. Thermal printers typically use ESC/POS or similar commands. Installing the wrong driver or having the communication settings (baud rate, parity) misconfigured can cause the printer to misinterpret data.
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 thermal paper is loaded upside down
Why it's wrong here
If thermal paper is loaded upside down, the heat-sensitive side will not be in contact with the printhead. This results in blank pages or extremely faint, unreadable output because the thermal reaction required for image formation cannot occur. However, the printer itself would still correctly receive and process the print job data; the issue is purely with the physical medium's interaction, not data corruption or misinterpretation.
- ✓
The printer driver is incorrect for the model
Why this is correct
An incorrect printer driver acts as an incompatible translator between the operating system and the printer hardware. It sends control codes and data formatting instructions that the specific thermal printer model cannot properly interpret or execute. This miscommunication causes the printer to render characters, symbols, or even blank spaces in a seemingly random or "garbled" fashion, as it attempts to process commands it doesn't understand.
- ✗
The printhead is dirty
Why it's wrong here
A dirty printhead, common in thermal printers, typically manifests as streaks, faded areas, or completely missing lines and dots within the printed output. This occurs because debris or residue obstructs the heating elements, preventing localized heat transfer to the thermal paper. While it degrades print quality, a dirty printhead does not alter the data stream itself, meaning the printer still receives correct character information, just fails to render it completely or cleanly.
- ✗
The printer is out of paper
Why it's wrong here
When a thermal printer runs out of paper, its internal sensors detect the absence of media, triggering an "out of paper" error message on the printer's display or the connected computer. The printer will halt all printing operations and will not attempt to print any characters, garbled or otherwise, until paper is reloaded. This is a physical resource issue, not a data corruption or interpretation problem that would lead to garbled output.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
Go deeper
Related to this question
Learn chapter
Printer Types and Components
Key term
Thermal printer
A thermal printer is a type of printer that uses heat to transfer an image onto paper, commonly used for receipts and labels.
Key term
CAN
A CAN (Controller Area Network) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer.
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JA
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.