As far as I and the rest of the techs here are concerned they are clunkers from day one. The calling for yellow toner problem can't be fixed by firmware as it is a problem with the laser going out of alignment. The check for this problem is to do a yellow skyshot and you will find that the rear side of the image is missing. The official Ricoh fix is to take the y/k laser unit out and re-seat it. The next problem this badly designed box has is that the toner bottle locking lugs break requiring you to strip the back of the copier out to replace the housing. If you are the unlucky sod who gets stuck with this make sure your diary is clear for the rest of the day. The plastic auger in the toner hopper has a much higher then usual failure rate as well.
Tip for young players, if you do have to strip the back of this disaster out to get to a clutch or toner hopper take photos of each part before you remove it. It might save you an hour our two when you go to reassemble it.
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