I have an HP Officejet 5110. I have an error message saying "Open door, clear carriage jam, then press enter". I have opened the door at the back but there is no jam. If I press enter it comes back with the same message I have equal problem as posted by mpjohnso on May 12, 2009: Turn on the power. It says "self check" then "initializing" then "carriage jam open door, remove jam, and press enter." In fact there is no jammed paper or opened door. I¨m thinking about disassembling it to find jam sensor..Possible dirty optocappler if it have some like in old bol mouse ?
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