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220-1102 Practice Question: A technician is troubleshooting a laser printer…
A technician is troubleshooting a laser printer that is producing smudged prints. The technician needs to remove the toner cartridge to inspect the drum. What safety precaution should be taken?
⚠ Common exam trap
CompTIA often tests the misconception that toner is toxic and requires a respirator, or that high-voltage components need manual discharge, when in fact the immediate risk is physical damage to the drum and the electrostatic fire hazard from improper cleanup.
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
✓
Avoid touching the drum surface and handle the cartridge carefully to prevent toner spills.
The primary safety precaution when handling a toner cartridge is to avoid touching the drum surface, which is sensitive to light, oils, and scratches, and to handle the cartridge carefully to prevent toner spills. Toner is a fine powder that can be messy and difficult to clean, but it is not a respiratory hazard under normal handling conditions, so a respirator is not required. The high-voltage power supply in a laser printer is typically discharged automatically when the printer is unplugged, and using a vacuum cleaner for toner spills is dangerous because toner can be electrostatically charged and may cause a fire or explosion in a standard vacuum.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Wear a respirator mask to avoid inhaling toner particles.
Why it's wrong here
Wearing a respirator mask is a sensible precaution, but it is not the most critical safety measure when handling a laser printer toner cartridge. The immediate hazard is not airborne toner inhalation during routine cartridge replacement, but rather physical contact with the photosensitive drum and potential toner spills on skin or surfaces. Standard dust masks are often ineffective against ultrafine toner particles, and the primary safeguard is still to avoid drum contact and handle the cartridge with care.
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Discharge the high-voltage power supply before touching the drum.
Why it's wrong here
Discharging the high-voltage power supply is unnecessary when the task is simply handling the toner cartridge, because the corona wires and high-voltage contacts are shielded inside the printer and are not touched during a standard cartridge swap. The drum itself is not a shock hazard; its sensitivity to light, scratches, and skin oils is the real concern. Thus, while high-voltage components exist, they are not the immediate risk in this scenario.
- ✓
Avoid touching the drum surface and handle the cartridge carefully to prevent toner spills.
Why this is correct
This is correct because the organic photoconductor (OPC) drum is extremely sensitive to light, scratches, and the oils from human skin, so any direct touch can cause print defects such as blank spots or streaks. Additionally, toner is a fine, powdery substance that can easily spill if the cartridge is tipped or shaken, creating a messy and potentially hazardous dust. Therefore, careful handling that avoids the drum and minimizes shock is the single most important safety practice for this procedure.
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Use a vacuum cleaner to clean any spilled toner immediately.
Why it's wrong here
Using a standard vacuum cleaner is unsafe because it generates static electricity that can cause the fine toner particles to cling to internal surfaces and, worse, blow the respirable dust back into the air through the exhaust. Regulated toner vacuums with HEPA filters are required to capture the ultra-fine particles, and even then, toner should be wiped or blotted before vacuuming. Using a regular vacuum risks contaminating the area and exposing the technician to airborne toner.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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