Is this hard to fix? And how can I do it?
The sensor is bent or broke, or going back further, its a board problem. Optical sensor electronics can go bad. ESpecially now with HP being so cheap on the solder.
Clean oops sensor, check sensor flag & position springs,,..
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SOURCE: HP Officejet Pro 8500 printer message "Paper jam"
An error code showing that there is paper jam alert, but no paper is in anywhere in the machine except in the tray.....I have checked all areas, taken the back carriage of the unit, opened the top and opened the machine. removed the paper tray, everything, but there is no paper stuck in the unit
SOURCE: Message shows "Paper jam" but there is no paper jam
try turning off the printer for about 10 sec. to clear its memory and turn it back on.. then print again
SOURCE: Machine shows "Paper Jam" error
There is a paper senser present in the paper lifting area. That part of your printer is not working properly. Replace that part and then try
SOURCE: hp 2355 all in one error message
mine HP was acting the same way after a jam. I contacted hp and they told me it was a hardware issue and that I would need to purchase a new printer. I found a KB on thier site for this issue. It involved removing both ink carts and then reseting the printer with the ink carts out. it seemed to work.
SOURCE: hp 5550 laserjet paper jam
Thhis error is usually due to a dirty photcell (sensor) in the tray 2 paper feed assembly or a broken sensor flag in the same assembly. Start be removing all cartridges and the transfer belt. Look in the bottom of the printer below the lowest cartridge slot for a removeable cover. That's the area your problem is probably in. I have incuded a link to a free PDF of complete service manual below. Good luck.
http://www.feedroller.com/Store/Service%20Manual/Color%20LaserJet%205500-5550.pdf
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