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Have/had the same problem: Getting "paper size mismatch" on the C4280 status
screen, after we got a paper jam. Every time we hit OK and put in paper,
Message about "Now printing Alignment page", it feeds through quickly, with
nothing printed on the page and reverts back to Paper size mismatch. Finally
got rid of the error, not sure how, but now when I try to copy anything, we only
get the lower right postion of the document that I'm trying to copy. Printing
from the PC seems ok. Powered off and back on, and it is back to P"now
printing alignment page, quick feed through and "paper size mismatch" error.
AND
When copying directly from the glass panel,it will only print a quarter of
the page -however it prints and coorectly if we print directly from the
computer.
The problem is the paper size sensors. Remove the plastic access panel that
is for access to the rollers in the back and has 4 rollers on it. There are two
papaer sensors attached to the printer circuit board (PCB). The control arm for
the sensor is a small plastic piece that extends slightly into the paper path
above the PCB. The plastic can be broken when you are removing a paper jam. I
stuck a small piece of a match stick in the sensor to keep it open (as though a
wider piece of paper was passing throught the printer). I can't switch to
smaller card stock, etc, but who cares, it works.
The copying problem is caused because the C4280 will not scan correctly until
after it does the alignment phase.
There are possible 2 places for the paper jam, either the Feeder has jammed or from the input tray. For Feeder, you just have to open the feeder from the top and see if there are any pieces sticking in. Else, you can open the print head cover and look for pieces of paper jammed in it. Another place you may see is by removing the rear of the printer, it is called a duplexor which can be taken off easily. You may find some bits of pieces in rear of the printer. To avoid getting another jam, try to keep the paper in a cool and dry place. If the paper absorbs any humidity, it starts crumpling which results in paper jam. You can also try fanning the papers before putting in a bunch and use a recommended paper for the printer. Hope this helps. Cheers...
OK it seems to be a problem with pick up clutch and vertical feed rollers ( When you open the left door and hinge in level of cass you will see axis with the tree little rollers- clean it with alcohol or water).Pick up clutch is better to replace it FK2-1068 (europe code).
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