Printer Repair Questions? Ask IT Technicians for Answers ASAP
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E3-40 is a toner density sensor error. It's probably toner getting built up on the sensor. It's located under the drum. It will look like 2 little LED looking things on a little circuit board about 3-4 inches long and half an inch wide. You can blow it out with canned air.If that doesn't work, then the sensor needs to be replaced.
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