At the very beginning, my HP Laserjet 4L got jam and after clearing jammed paper. It works for 5 to 6 printouts and finally the Paper LED blinking all the time. I'm sure it didn't has any paper left inside. I've disassembled the roller, control PCB & Main PCB.. and still blinking while fixed it back. At this moment I didn't connet to PC.
Thanks a lot.
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When you removed the paper jam, was the paper torn? If so, did you ensure that you found all the pieces. (Put the piece of paper back together like a puzzle to verify). There could be a piece of paper stuck in the printer that is causing the paper sensor to fail.
The other possibility is that when you removed the paper jam, something became dislodged in the printer. Forcefully removing paper from the printer can cause this.
Remove the toner, and try to gently pull out the paper jam.. If the page gets torn, or ripped, make sure you have all the pieces of the paper removed. Then re-start the printer. Print a test page to make sure the paper path is clear..