IBM LA75P - Manual (Page 26)

There is a paper skew.
i If the paper is damaged, replace with new paper.
ii If the paper bin is not properly adjusted, readjust, then reload the bin.
iii The feeder pick-up rollers may not be gripping the paper properly.
Check the paper surface for defects. Clean the pick-up rollers.
Note: If the feeder inserts paper correctly on to the printer platen
but the paper then skews, there is a printer fault. In such a case,
refer to the Maintenance chapter in the LA75 Plus Companion
Printer Installation and User Guide EK-LA75S-UG-001.
There is a paper eject malfunction.
i Check the state of the output stacker. If it is full, empty it.
ii If the printhead has been incorrectly adjusted for paper thickness,
readjust the printhead adjustment lever. (See Section 3.3 in the LA75
Plus Companion Printer Installation and User Guide.)
iii Check that the paper conforms to the required specifications.
If it does not conform, replace with new paper that does conform to the
specifications.
4–4 Maintaining the Sheet Feeder