Help needed on ricoh ft 4015 copier

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.