The DE-20 and 21 are the new tandem trays that are installed on the smaller models; where trays 3 & 4 would normally be. The default with these new tandems is tray 3. The bigger Sharps have always had the tandem trays as 1 & 2; tray 1 being default. Same thing just on the bottom.
That being said, these things are troublesome. So much so that we prefer to sell the LCC instead.
A few things I have noticed:
-Be sure to adjust the paper guide in the trays as they are a lot more sensitive to skewing.
-Remove the rear cover and inspect the longer belt of the two. They are extremely loose and cause timing issues. So loose that you can easily squeeze both sides together. The same belt can also have a "bubble" of the belt surface where it is stretched.
-Had an instance, 5141, where the tandem was a constant issue. No big whoop, swapped it out with a brand new one, turn it on and the tandem trays were grayed out. Odd thing was I could configure and print from the tandem, but no copy. Tried everything including a full wipe, nothing touched it. I went out the next day, put in a DE-14 and haven't heard from them since.
-565 family has an issue with the trays when running 50-28 tray adjustments. The machine thinks that trays 3 & 4 are tray 1 and prints the one block scan pattern. Didn't think a 5 digit registration value was possible; I was wrong.
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