Question about HP DeskJet 3520 InkJet Printer
Possible that the in-detect switch/optocoupler detect is sensing a fault.
Check on the paper feed section for the in-detect sensor and make sure that it is reading into the paper. If there is no issue in this section the voltage change on the sensor must be checked with a multimeter as the paper is inserted.
if absent replace the sensor or otherwise the fault is in the main board which can be a digital switch failure to the processor..
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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