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It's either a speck on the scanner glass for the document feeder, or a smear of toner on one of the rollers. Check the skinny band of glass inside the document feeder for specks and clean it with a lint-free soft cloth and a little rubbing alcohol or a very little bit of water.
The main thermistor TH1 has poor contact or open circuit.The thermal switch TP1 has an open circuit.The fixing heater has an open circuit.The SSR is faulty or the DC controller PCB.After the main power switch is turned ON the temperature detected by the main thermistor does not reach 70 C.The error must be reset in service mode :COPIER - FUNCTION - CLEAR - ERR
Main motor, motor board, clock pulse
Duplex side to side problem
Scan reverse sensor or scan
Scan return problem
Document sensor, scan reverse sensor or scale
Blank lamp open or lens home problem
Document feeder board problem or document feeder interface problem
The document feeder has multiple sensors in it. sometimes they hang up and stay stuck out of place. Other sensors might get paper dust on the face of the sensor. If you can open the document cover, locate the sensors and see if any are ajar or the sensor flag fell out of place. Also look to see if a paper is stuck in any of the paper path areas. Not seeing the machine it is hard to say if it fed paper and says check document, if it did, clean the feed wheels with a wet paper towel.
So, the feeder will not pull in the paper, If this is the case, check the throat of the document feeder for foreign objects, (staples, paperclips, post it notes, or signature flags). you can clean the rollers with alcohol, and blow out the document feeder with compressed air. (Computer Duster)
I'm pretty sure you might have solved this problem already, but this might help others.
Make sure that the platen glass is clean near the right side of the
machine, where the document is scanned when going through the document
scanner. Remember, when placing a document on the glass to copy it
that way, you would place it on the glass on the left side of the
machine. When scanning through the ADF, the scanning unit itself moves
to the right side of glass and scans the document as it moves through.
We had the same issue and found out that there was a little spec of
dirt on the glass. After cleaning it, the problem was solved.