How-to: Convert Z-type Color Drums
Hold down the left and right position arrows while turning on the power. For MZ machines, use first position drum arrows
This tells it that it is a ledger size drum
This tells the Riso to recognize newly installed ink tube
A "sky shot" is simply a scan with nothing on it. Sometimes it helps to put a 1" - 2" strip of paper on the feed side of the scanner to help prevent the printed image from wrapping around the drum because of too much ink on the lead edge.
Usually more than 500.