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Have hp envy 4520 printer say paper jam can not find any paper jam printer
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[QUOTE="VA1DER, post: 220558, member: 15186"] HP has a special sensor that determines where the print head is by using a plastic strip that is strung from one side of the printer to the other. This plastic strip is clear with microscopic grooves on it and an optical slot sensor mounted on the print head shines a low power laser through it. The printer then knows where the print head is by counting the grooves as the print head moves. Usually that strip is mounted close to where the drive belt for the print head is, and mounted using springs on either side to maintain tension. If that strip gets any ink on it (and even microscopic amounts of ink "mist" inside the printer can deposit on it over time) then the printer can no longer sense where the print head is and gives you carriage jam errors. Other causes are tiny bits of paper covering the optical sensor, ink covering the sensor, or a failure of the limit swtiches that tell when the print head is fully at one side. [/QUOTE]
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Have hp envy 4520 printer say paper jam can not find any paper jam printer
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