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Lexmark doesn't sell or manufacture replacement hinges. If your printer is still under warranty, please contact our technical support team via phone so they can send you a replacement printer. If not, just remove the hinge and its assembly so you will be able to totally close the cover of the printer and be able to scan from the ADF.
It may be a bad hinge on the document feeder. I have seen several times where the left hinge ( when looking at machine from front) does not close all the way. Close the adf and look at the gap between the copier and the adf. The gap should be the same from the front to the back. If the gap is bigger at the rear ( when looking at the left side of the machine) then you need to replace the left hinge. You can also try pushing down on the document feeders' left side as it feeds the paper. if it works while pushing down, then it is the hinge.
Doc jam error usually means a jam in the adf (auto doc feed) when feeding a fax or doc to copy.
The most common reason brother mfc,s of this configuration have doc feed issues is believe it or not the hinge that operates the lid/adf, specifically the left side one (looking from the front). Inside the hinge there are two springs exerting tremendous force on the hinge (that enables the lid to stay up by itself) however this force eventually slowly breaks the fulcrum point of the hinge which leads to the lid not closing properly which means a sensor under the lid does not activate properly resulting in the adf stopping and resulting in the machine registering a jam. the difference between the sensor activating or not can be as little as a millimeter and is not often disernable. the hinge needs replacing by a techo.
the other reason could be you just have dirty adf feed rollers, clean them with a cotton rag dipped in metho, open the adf lid and give the rollers a scrub. the rollers should have 'tread' on them similar to a tyre, if not they are worn and need replacing.
One other possibility is there may be a paper fragment left over from a jam removal still caught in the paper path and activating a sensor activator that tells the machine paper is coming or going. most commonly in the section where the paper is looping on its return journey back out of the adf, open the adf lid, have a look with a torch and see how you go.
You need a new hinge so the cover will sit down properly, or paper will jam anyway, but it sounds like there is still a scrap of paper on one of the sensors inside the ADF, you need to look with a flashlight down thru where the paper goes and also look up thru the slot with the ADF lifted.
To answer Meyerson's questions:
My symptoms did not include papers jamming in the ADF -- in fact, the ADF didn't work at all due to the broken left hinge. :( Also, I don't recall having any unusual problems with the ADF jamming frequently before the hinge broke to the point where the ADF didn't work at all.
I obtained the replacement ADF left hinge assembly by searching online for a parts dealer. I believe I ended up ordering the part from Precision Roller.
I hope this helps,
Look at back of machine and at your new hinge, note the screw hole, if you undo both of those on the back of the printer, entire doc feed will come up and out, BECAREFULL just lift A LITTLE is enough to enable hinge base to be free of sockets (many cables attached) and place doc unit slightly sideways on copy glass to enable yourself access to 3 screws that hold hinge.
ADF can be bought from a dealer, it has a few cables that need removal so it is a little tricky, it is also a expensive part (approx Aus$200, why are you replacing it, are you sure you dont just need to clean feed rollers or there is also another common fault on these doc feeders, the left side hinge breaks( replace hinge)
here is the brother part number for the adf (complete), you will need to purchase from a autherised brother dealer -
Check that the hinges that are on the ADF (the bit that you can lift to reveal copy glass) are not broken, the left side hinge breaks, causing the ADF switch (also on left) to not close, causing problems like yours.