The exhaust fan plays a critical role in maintaining proper ventilation, removing smoke and debris, and ensuring stable internal operating temperatures during marking and engraving. If the fan speed is abnormally low or airflow is insufficient, overall performance and equipment longevity may be affected.
This guide provides a systematic approach to identifying common causes—including dust accumulation, mechanical obstruction, or wiring issues—and outlines step-by-step inspection and corrective procedures to restore normal fan operation safely and effectively.
¶ Symptom Description
- After the device is powered on and running, the exhaust fan starts but the rotation speed is noticeably low, resulting in weak airflow.
- During operation, the fan produces abnormal noise or shows signs of sticking/jamming, and normal exhaust performance cannot be achieved.
¶ Possible Causes
- During marking/engraving, metal chips or debris entered the fan housing.
- With long-term use, heavy dust buildup on the fan blades or blade aging increased resistance.
- The power cable is loose, or the wiring terminals have poor contact.
¶ Preliminary Assessment
Non-disassembly inspection
- After power-off, use a flashlight to illuminate the back of the fan and check for dust or debris accumulation inside.
- Gently rotate the fan blades with needle-nose pliers and check whether rotation is restricted or if any abnormal noise is present.
- Use a high-pressure air gun aimed into the fan to blow out accumulated dust and debris.
Disassembly inspection
- After power-off, inspect the fan power wiring and the plug/terminals to check for any looseness.
- Manually rotate the fan blades to check for sticking/jamming or abnormal noise.
- Check for dust buildup and/or foreign objects obstructing the fan.
¶ Troubleshooting
The following steps 1–4 are relatively straightforward and require minimal operational skill. It is recommended to verify and inspect them sequentially in the order listed.
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Stop the machine and disconnect the main power supply.
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Use a flashlight to illuminate the back of the fan and check for any dust or debris accumulation inside.
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Gently rotate the fan blades with needle-nose pliers and check for any sticking or abnormal noise.
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Use a high-pressure air gun aimed at the fan to blow out any accumulated dust and debris.
¶ Corrective Actions
- If buildup is present, use a high-pressure air gun aimed into the fan to blow out and remove dust and debris.
- If sticking/jamming is severe, proceed to the disassembly inspection step.
- Reseat and retighten any loose plugs/connectors or terminals.
- Thoroughly clean the fan blades and remove dust and foreign objects inside the device, then use an air gun to blow out the air duct.
¶ Verification Test
Start and run the device, observe whether the fan speed returns to normal, and confirm there is no abnormal noise and no sticking/jamming.