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3-56 Phaser 8400/8500/8550/8560 Color Printer Service Manual
Error Messages and Codes
N4X Y-Axis Motor stalled while the print exited the printer.
1. Check the media, generally label, trifold or envelopes cause this error.
2. Try running fewer sheets through the tray.
3. Ensure the Process Drive is correctly aligned, refer to “Homing the Process
Drive Train” on page 6-8.
4. Run the Check Y-Axis Motor test, replace if necessary.
5. Run the Belt Slip test.
6. Replace the Tray 1 Separator Pad.
7. Replace the Process Drive.
N5T
Y-Axis motor out of position while the printer transfixed the print.
N5W Y-Axis motor out of position while the printer imaged the Drum.
1. Inspect the Y-Axis drive belt.
2. Run the Check Drum Y-Axis Encoder test.
3. Run the Check Drum Y-Axis Drive test.
4. Run the Check Drum Y-Axis Belt Slip test.
5. Replace the Y-Axis motor or Drum assembly if necessary.
N6T
Y-Axis motor media short during transfix. The media was measured to be
shorter than it was believed to be.
1. Measure the media to verify it matches the selected length.
2. Ensure ground integrity of the printer, see page 4-65.
3. Run the Check Drum Y-Axis Encoder test.
4. Pull the preheater and check the preheater flag for ink or paper interference.
5. Replace the preheater.
Legal size paper from Tray 4 in standard print mode may buckle. Use slower
print mode.
N7T Y-Axis motor media long during transfix. The media was measured to be
longer than it was believed to be.
1. Measure the media to verify it matches the selected length.
2. Try heavier media.
3. Try loading only a few sheets. Some photo media may require running one
sheet at a time.
4. Run the diagnostic Check Drum Y-Axis Encoder test.
5. Replace the Pick Assembly and retard roller.
6. Run the clean ink smears and check the preheater exit flag for debris.
7. Remove the paper preheater and ensure that the exit flag does not interfere
with the assembly. Replace the Paper Preheater if all else checks out.
P4A
Process motor stalled on abnormal shutdown.
P4B Process motor stalled on power-up following a normal printer shutdown.
P4C Process motor stalled during mechanical recovery.
P4D Process motor stalled during an printer warm-up.
P4E Process motor stalled while the printer was in its ready state.
P4F Process motor stalled while the printer was in a fault state.
Jam Code Troubleshooting Procedures (Continued)