Oki ML490 User Manual page 46

8 Place continuous forms paper on the first two pins of either
tractor.
Important!
You must keep the number of paper holes engaged on either
pin the same. If you don't the paper will skew and jam.
9 Close the right tractor cover.
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Microline 490/491 User's Guide
10 Adjust the left tractor until the holes in the paper are
centered on the pins then lock the lever and close the left
tractor cover.
Note: If the paper is too loose or too tight it can cause jams.