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Check for some obstruction in the paper path where the paper stops. There can also be paper cuts in some of the sensor arms that may be giving hesitation delys csusing the jams. Jam codes in service mode will also help isolate the problem to a more specific area.
It's hard to say without more details, but two things come up quickly to mind. 1) is the paper only meant to be printed on one side? Some are, and should indicate so (i.e. 'load this side up'). 2) the paper is goofed up (bent, flexed, twisted, loosened up, etc.) by the first printing and therefore is getting jammed.
I'd suggest changing brand of paper and / or be very careful loading, as this seems like a pretty regular paper jam situation.
1-you need to determine if the two are part of the same problem
If the jamming occured first with no signs of copy quality issues then, it depends on where it's jamming. Locate the 1st jammed paper, the one that is furthest towards the exit. this stops all other paper after it. for example if there are papers in the fuser -by the drum and coming out if the tray the problem is most likely in the fuser area. Are the papers being crumbled? or just stop at that location?
2-the half dark copies could be a couple of things
a) the seperation unit is going bad and making the copies rise up against the drum
b)does the lamp that come on to scan the original stay on the whole lenght of the paper or does it turn off half way down the page? if yes the cable that connects to the lamp is probably broken and not making contact at the half way point as it is scanning.
Have you tried to run copies from both paper trays? Will it jam in the same spot with both trays? If one works, but the other jams, it may be as simple as making sure the paper tray is set to the correct paper size? Is it set up in the paper tray as LTR, but the tray is saying LTR-R on the display. If so just change the paper size knob to the correct size. Also, if it stops in the same spot with all of the trays, look for something blocking it. Also, try to cheat the side door and make sure everthing is turning correctly.. Good Luck...
Is it looking for toner or is there still a jam in it. You may want to try to turn it off and unplug the sorter and turn it back on. If that dose not work turn off again and unplug the adf and turn it on again. If that dose not work if you have unplug the bottom 2 trays. If one of those is causing the problem look deeper in to one of those units. Also, will it showw or flash a error code on the display?