• Code: 6902
• Description: Rechecking the error after the power switch was turned OFF and then ON again because an error was detected in the fuser unit. (This message is displayed for approximately 15 minutes when the machine is restarted after error code 6901 has occurred.)
• Remedy: 1 Connection failure of a fuser unit harness Reconnect the fuser unit harness. 2 Connection failure of the eject sensor harness Reconnect the eject sensor harness. 3 Eject sensor PCB failure Replace the eject sensor PCB ASSY. 4 Fuser unit failure Replace the fuser unit. 5 Low-voltage power supply PCB failure Replace the low-voltage power supply PCB ASSY. 6 Main PCB failure Replace the main PCB ASSY. Note: • Turn OFF the power switch. After the fuser unit has cooled sufficiently, turn ON the power switch again and leave the machine for 15 minutes. This problem may then be cleared. • To release the fuser unit error after taking appropriate measures, enter the maintenance mode once and quit it with the function code 99.

• Code: 6A00
• Description: Detected discharge that may be attributable to dirty corona wire on the drum unit.
• Remedy: • Slide the green tab of the drum unit to left and right for two to three times to clean the corona wire. • Clean the electrode of the drum unit. • Replace the drum unit.
  1 Dirt on the high-voltage power supply PCB terminal Clean the electrodes of the machine. 2 High-voltage power supply PCB attachment failure Check if each electrode comes back smoothly after pressing it. If not, reattach each electrode. 3 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.

• Code: 6D00
• Description: Detected more LTs than connectible limit.
• Remedy: • Reduce LTs to acceptable numbers. • Reconnect LTs.
  1 Dust around the LT/TT connector Clean the LT/TT connector. 2 Malfunction of the LT control PCB Install the latest main firmware. 3 Machine or LT/TT connector failure Replace the machine or LT/TT connector. 4 LT control PCB failure Replace a LT control PCB ASSY. 5 Main PCB failure Replace the main PCB ASSY.

• Code: 6F00
• Description: Detected irregular power supply for less than 100 times.
• Remedy: • Turn the power switch OFF and then back ON again. • Use a noise filter on the power supply. • Install a voltage stabilizer to the power supply unit.

• Code: 7000
• Description: The eject sensor does not detect paper pass after the registration rear sensor detected the paper pass.
• Remedy: • Remove the jammed paper. • Replace the drum unit with a new one.
  1 Foreign object inside the machine Remove the foreign object. 2 Connection failure of the eject sensor harness Reconnect the eject sensor harness. 3 Eject actuator coming off or caught in some sections of the machine Reattach the eject actuator. 4 Fuser cover attachment failure Reattach the fuser cover. 5 Eject sensor failure Replace the eject sensor PCB ASSY. 6 high-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 7 Fuser unit failure Replace the fuser unit. 8 Damaged fuser gears or drum gears Replace the main frame L ASSY. 9 Main PCB failure Replace the main PCB ASSY.

• Code: 7100
• Description: The eject sensor remains ON (paper pass detected) even after the registration rear sensor detected the end of paper pass.
• Remedy: • Remove the jammed paper. • Check if the back cover is open during duplex printing.
  1 Foreign object in the rear of the machine Remove the foreign object. 2 Eject actuator caught in some sections of the machine Reattach the eject actuator. 3 Fuser cover attachment failure Reattach the fuser cover. 4 Eject sensor failure Replace the eject sensor PCB ASSY. 5 high-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 6 Fuser cover failure Replace the fuser cover. 7 Damaged eject roller 1 drive gears Replace the main frame L ASSY. 8 Main PCB failure Replace the main PCB ASSY.

• Code: 7200
• Description: When feeding from the MP tray, the registration rear sensor does not detect paper pass within the specified time after the registration front sensor detected paper pass.
• Remedy: • Remove the jammed paper. • Add the paper properly using the MP tray paper guide. • Close the front cover correctly.
  1 Foreign object in the front of the machine Remove the foreign object. 2 Registration rear actuator coming off or caught in some sections of the machine Reattach the registration rear actuator. 3 Connection failure of the registration front/rear sensor harness Reconnect the registration front/rear sensor harness. 4 Connection failure of the registration clutch harness Reconnect the registration clutch harness. 5 MP feed frame attachment failure Reattach the MP feed frame. 6 Registration rear sensor failure Replace the registration front/rear sensor PCB ASSY. 7 Registration clutch failure Replace the registration clutch. 8 high-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 9 Damaged gears in the paper feeding system Replace the main frame L ASSY. 10 Main PCB failure Replace the main PCB ASSY.

• Code: 7301
• Description: When printing from the paper tray 1, the T1 paper feed sensor does not detect paper pass within the specified time while the T1 paper empty sensor detects some paper set.
• Remedy: • Remove the jammed paper. • Add the paper properly using the paper tray 1 paper guide.
  1 Foreign object in the front of the machine Remove the foreign object. 2 T1 paper pick up roller holder attachment failure Reattach the T1 paper pick up roller holder. 3 T1 paper feed actuator attachment failure Reattach the T1 paper feed actuator. 4 Connection failure of the T1 pickup clutch harness Reattach the T1 pickup clutch harness. 5 Connection failure of the T1 paper feed sensor harness Reconnect the T1 paper feed sensor harness. 6 Connection failure of the HVPS flat cable Reconnect the HVPS flat cable. 7 PF kit 1 failure Replace the PF kit 1. 8 T1 pickup clutch failure Replace the T1 pickup clutch. 9 T1 paper feed sensor PCB failure Replace the T1 paper feed sensor PCB ASSY. 10 T1 paper empty sensor PCB failure Replace the T1 paper empty sensor PCB ASSY. 11 Damaged gears in the paper feeding system Replace the main frame L ASSY. 12 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 13 Main PCB failure Replace the main PCB ASSY.