• Code: 6901
• Display: Self-Diagnostic Turn the power off, then on again. Leave the machine for 15 min.
• Description: An error occurred in the fuser unit when the power switch was turned ON or sleep mode was released.
• Remedy: 1 Connection failure of each fuser unit harness Reconnect each harness of the fuser unit. 2 Connection failure of the eject sensor PCB flat cable Reconnect the eject sensor PCB flat cable. 3 Fuser unit failure Replace the fuser unit. 4 Eject sensor PCB failure Replace the eject sensor PCB ASSY. 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: 6902
• Display: Self-Diagnostic Will Automatically Restart within 15 minutes.
• 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 each fuser unit harness Reconnect each harness of the fuser unit. 2 Connection failure of the eject sensor PCB flat cable Reconnect the eject sensor PCB flat cable. 3 Fuser unit failure Replace the fuser unit. 4 Eject sensor PCB failure Replace the eject sensor PCB ASSY. 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
• Display: Drum ! Slide the Green tab on Drum Unit.
• Description: Detected discharge that may be attributable to dirty corona wire on the drum unit.
• Remedy: <User Check> • Slide the green tab of the drum unit to left and right for two to three times to clean the corona wire. • Clean the terminal 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 electrodes attachment failure Check if the problem disappears after pressing each electrode. If not, reattach the electrodes. 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: 6F00
• Display: Print Unable ZC Turn the power off and then back on again.
• Description: Detected irregular power supply for less than 100 times.
• Remedy: <User Check> • Turn the power switch OFF and then back ON again. • Put a filter into the power supply. • Install a voltage stabilizer to the power supply unit.

• Code: 7000
• Display: Jam Inside Open the Front Cover, pull out the Drum Unit completely and remove the jammed paper.
• Description: The eject sensor does not detect paper pass after the registration rear sensor detected the paper pass.
• Remedy: <User Check> • Remove the jammed paper. 1 Foreign object inside the machine Remove the foreign object. 2 Connection failure of the eject sensor PCB flat cable Reconnect the eject sensor PCB flat cable. 3 Eject actuator coming off or caught in 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 Fuser unit failure Replace the fuser unit. 7 Damaged gears in the feeding system Replace the main frame L ASSY. 8 Main PCB failure Replace the main PCB ASSY.

• Code: 7100
• Display: Jam Rear Open the Back Cover and remove the jammed paper, then press Start.
• Description: The eject sensor remains ON (paper pass detected) even after the registration rear sensor detected the end of paper pass.
• Remedy: <User Check> • 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 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 Fuser unit failure Replace the fuser unit. 6 Damaged gears in the feeding system Replace the main frame L ASSY. 7 Main PCB failure Replace the main PCB ASSY.

• Code: 7300
• Display: Jam Tray Remove the jammed paper from Tray.
• Description: When printing from the paper tray, the registration front sensor does not detect paper pass within the specified time after the paper feed sensor detected paper pass.
• Remedy: <User Check> • Remove the jammed paper. • Close the paper tray correctly. 1 Foreign object in the front section of the paper tray Remove the foreign object. 2 Paper dust cleaning roller attachment failure Reattach the paper dust cleaning roller. 3 Connection failure of the registration front/rear sensor PCB harness Reconnect the registration front/rear sensor PCB harness. 4 Connection failure of the HVPS flat cable Reconnect the HVPS flat cable. 5 Registration front actuator coming off or caught in some sections of the machine Reattach the registration front actuator. 6 HVPS flat cable breakage Replace the HVPS flat cable. 7 Registration front sensor failure Replace the registration front/rear actuator holder ASSY. 8 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 9 Damaged gears in the feeding system Replace the main frame L ASSY. 10 Main PCB failure Replace the main PCB ASSY.

• Code: 7700
• Display: Jam 2-sided Pull out the Duplex Tray at the back of the machine and remove the jammed paper.
• Description: The registration front sensor does not detect paper pass within the specified time after the first side was printed in duplex printing mode.
• Remedy: <User Check> • Remove the jammed paper. • Close the back cover correctly. • Close the paper tray correctly. 1 Foreign object in the duplex paper feed system Remove the foreign object. 2 Foreign object in the duplex paper feed system of the paper tray Remove the foreign object. 3 Back cover attachment failure Reattach the back cover. 4 Fuser cover attachment failure Reattach the fuser cover. 5 Duplex tray failure Replace the duplex tray. 6 Damaged gears in the feeding system Replace the main frame L ASSY. 7 Main PCB failure Replace the main PCB ASSY.