Xerox Phaser 8400 Service Manual page 130

Jam Code Troubleshooting Procedures
M4H Paper path motor stalled while the printer performed printhead maintenance.
M4J Paper path motor stalled while the printer performed printhead purge.
M4K Paper path motor stalled while the printer performed an oil transfix roller cycle.
M4L Paper path motor stalled while the printer was in standby mode.
M4M Paper path motor stalled while the printer picked from Tray 2.
M4N Paper path motor stalled while the printer picked from Tray 3.
M4P Paper path motor stalled while the printer picked from Tray 4.
M4Q Paper path motor stalled while the printer picked from Tray 1.
M4R Paper path motor stalled while the printer duplexed the print.
M4S Paper path motor stalled while the printer staged the print for transfix.
M4T Paper path motor stalled during transfix.
1. Verify the media in the tray is supported by the printer.
2. Inspect the paper path for obstructions.
3. Run the Paper Drive Power test.
4. Run the Media Path Motor and Shafts test.
5. Replace the media path drive assembly.
N2T Y-Axis motor event during transfix (Tray 1 only - probably a multi-pick).
1. Verify the media in the tray is supported by the printer.
2. Try a heavier media.
3. Inspect Tray 1 separator pad. Replace if necessary.
4. Send a snippet to turn off the multi-pick detection code.
5. Run the Y-Axis Motor test, replace if necessary.
6. Run the Voltages test, replace the power supply if necessary.
N2W Y-Axis motor event during imaging. Probably a software fault.
1. Ensure ground integrity of the printer, see page 4-77.
N4A Y-Axis motor stalled on power-up following an abnormal printer shutdown.
N4B Y-Axis motor stalled on power-up following a normal printer shutdown.
N4C Y-Axis motor stalled during mechanical recovery.
N4D Y-Axis motor stalled during an printer warm-up.
NFE Y-Axis motor stalled while the printer was in its ready state.
N4F Y-Axis motor stalled while the printer was in a fault state.
N4G Y-Axis motor stalled while the printer performed an auto drum maintenance cycle.
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Phaser 8400/8500/8550 Color Printer