I think I might know what your problem is:
- You need to look at the *left* end of what used to be the rotating paper-exit roller bar (US Screen removes a bunch of stuff from that bar, but it still has to be there so it can rotate during startup to trigger the sensor).
- Power off the printer.
- Remove the front stainless trim panel around the CMYK tanks so that you can more easily get at the sensor inside. Then remove the yellow ink tank.
- If you look in and down just to the right of the yellow ink tank, along the end panel of the printer assembly, you will see a small black rotating cam at the end of that bar which moves a small sensor switch up and down as it rotates. You can easily roll the bar around by hand to see how it works.
- Check for dirt (shirt lint, etc) which might be interfering with the little sensor ... what looks like a small black microswitch with a white arm sticking out of it toward the rear of the printer and up against the rotating cam.
- It might help to hit that sensor with a gentle blast of "canned air". Make sure the sensor arm is free to move up and down. Be *very* careful you don't damage the sensor ... it's rather delicate!
- Make sure that you rotate the bar so it is sitting flat side down and the cam has allowed the sensor arm to move upward.
- Replace the yellow tank and power up the printer. It should be fixed unless the sensor itself has failed for some reason. If things are ok, replace the stainless trim ... be careful not to over-tighten the hex-head bolts or you'll never get them out again
I hope this helps. This is a very rare problem, so not a lot of folks have hit it.
Good luck!
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