Problem with paper jam. Unfortunately, after removing the bottom tray of the 2840, I could see the paper but was unable to pull it out without ripping. Now the paper is deeper in the machine and I cannot reach it.
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Your best method of troubleshooting is the manual sensor test as this is a generic paper jam error.
on your sensor tests:
0 = off 1 = on
A = TOP OF PAGE SENSOR B = PAPER LOOP SENSOR C = N/A D = FUSER PAPER SENSOR E = DELIVERY-TRAY PAPER-FULL SENSOR F = FUSER PRESSURE-RELEASE SENSOR G = MEDIA SENSOR H = N/A I = MP TRAY SENSOR J = CASSETTE SENSOR K = DOOR OPEN DETECTION SWITCH L = DEVELOPING ESTRANGEMENT SENSOR - CLR M = DEVELOPING ESTRANGEMENT SENSOR - BLK N = MP TRAY MEDIA POSITION SENSOR
A-F are paper path sensors - you can toggle them and watch if they change from 0 to 1. If they do, the problem is not in that area.
G can have states from 0-7 each one representing a different type of paper - shouldn't have anything to do with jamming.
hope this helps. probably a tiny piece of paper or toner somewhere. could also be a torsion spring out of position on a flag.
It appear from here that the exit sensor may be dirty and you can use canned air and blow it out.
You may also be missing the paper out sensor that is located at the bottom of the printer oposite of the paper tray when you pull it out. When the flag arm has fallin out, it will give a false paper jam error when the last sheet has printed from the tray, not knowing or detecting that the tray is now empty.
Leave Tray1 closed. Remove tray 2. Push down on green arrows visible after removing Tray 2. You should see the jammed paper on the plastic tray which becomes accessible after pushing down on the green arrows.