On the underside of the ADF (Automatic Document Feeder) is a dual metal bar that is supposed to force the paper down on to a bed as it exits the mechanism. At the end of a page scan, the paper is retained in the mechanism until a decision is made as to whether it is to be subjected to double-sided scanning or not. If not, the page is fed forward and this dual bar is supposed to force the page away from the ledge on the exit mechanism onto the bed below.
Unfortunately with thin (and normally smaller) paper, this does not happen. The paper remains on the ledge until the next sheet nudges it off. This process sometimes results in the first sheet being forced up and catching on the cantilevered ADF feeder tray above the bed, causing the subsequent sheets to bunch up, causing a horrific paper jam if you don’t monitor the process continuously.
On the last page of a scan, if the last sheet doesn’t fall from the ledge, the last sheet can be partially drawn back into the mechanism. The scanner does not detect the paper presence as an error condition, and failure to notice (it is hidden away beneath the paper feeder superstructure) results in an even bigger paper jam. See later for details of extraction of paper.
A paper feed jam can be caused by the point above, or as a result of pages sticking together causing a misfeed. Hitting the “cancel” button on the screen takes the system many, many seconds (30 or more) to react, which allows the paper jam to get much worse. An “emergency cancel” that would stop the scan instantaneously would certainly have been appreciated.
When a paper jam has occurred, the only way to get the paper out is to disconnect the power, release the ADF feeder rollers, and ease the paper out. Sometimes you have to remove the ADF scanning window. With flimsy paper, especially when overdriven as described above, it is frequently impossible to get the paper out in one piece because it is not possible to relieve the pressure on the rollers.
When you disassemble all that is accessible, there is still a small area in the rollers that it is impossible to access, even with tweezers. When paper does get stuck in this way, it is difficult in the extreme to extract it. There is no way to activate the rollers directly to try to drive it out. The only way is to run another piece of paper through until it jams -- in the hope that it dislodges the small piece. It takes several attempts and a lot of time and effort to clear this, especially since it has to be attempted as a normal scan with all the associated startup delays. I believe it is possible to remove the rollers, since you can buy a replacement roller kit, but there are no instructions as to how to do this.
Abrasion of the ADF scanning window (a transparent plastic sheet 8 inch x 3 inch plus mounting plastic) occurs very quickly resulting in a shadow on all scans. I am not sure if this happens more quickly because of the scanning of harsher paper like newsprint. It costs $18.35 (without shipping) to replace it each time, which becomes exorbitant given the number of times it would have to be done to maintain a clear image.
The cleaning cloth for the ADF supplied with the scanner, (also with the replacement separator bar, and as a specific purchase item) is too thick to be fed through the rollers under any circumstance, despite the instructions in the user manual and on the packaging (which incidentally do not agree).
This entry was submitted by Aubrey Kagan and edited by Rob Spiegel
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