Lexmark T630 - Printer - B/w, Service Manual

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Diagnostic information
2-77
4060-xxx
Double feeding paper
Note: If double feeding paper occurs mostly from the bottom of the stack, check for missing or
damaged restraint pads in the tray.
Multipurpose tray. Paper fails to feed from the multipurpose tray.
The pick roll should make one complete revolution and stop with the flat side down. If the pick
roll turns but does not pick paper, check the roll for signs of wear, oil or grease on the surface of
the pick roll or slick spots. If you find a problem, replace the pick roll assembly. Check to ensure
the media that is being fed through the multipurpose tray assembly meets recommended paper
specifications.
Parallel port service check
Run the “Parallel Wrap Test” on page 3-9 .
Note: The Parallel Wrap Test is designed to check the parallel port hardware by using a wrap plug
(P/N 1319128) and invoking the Parallel Diagnostic Test. This test helps isolate the printer from the
parallel cable and host. The test provides failure information on the display for approximately three
seconds. If the test indicates that a problem is detected, replace the controller board.
FRU Action
1 Paper Paper is usually the primary cause of a double feeding paper
problem. Flex the paper before placing the paper in the tray. Edge-
welded paper is the most common cause of double feeding. Loading
the paper in the tray in different locations and directions and using
rough paper and short grain paper also causes double feeding.
2 Autocompensator Make sure the counterbalance spring is not missing, loose, or broken
at the top of the autocompensator arm assembly. If you find a
problem, replace the autocompensator assembly.