• Code: 6230
• Description: Broken fuser edge thermistor wire Fuser edge thermistor detects low temperature for 1.6 s.
• Causes:
• Remedy: Fuser unit 1. Check there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit and Exit PWB (YC2) Exit PWB (YC1) and Main/Engine PWB (YC11) 3. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 4. Replace the fuser unit. Exit PWB Replace the Exit PWB. Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.

• Code: 6250
• Description: Abnormally low fuser edge thermistor temperature During the warming up and the printing, the edge thermistor has detected less than 100 °C/212.0 °F for 1 s successively.
• Causes:
• Remedy: Reduction of the power supply voltage 1. Check that no voltage drop of more than 10% of the rated is caused during printing. 2. If the power is overloaded, change the AC outlet that supplies power. Fuser unit 1. Check there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit and Exit PWB (YC2) Exit PWB (YC1) and Main/Engine PWB (YC11) 3. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 4. If the fuser heater is not turned on (broken thermostat wire), replace the fuser unit. Power source PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Power source PWB (YC105) and Main/ Engine PWB (YC20) 2. Replace the power source PWB. Exit PWB Replace the Exit PWB. Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.

• Code: 6400
• Description: Zero-cross signal error During the fuser heater on, and no detection the disconnection 24V, the zero-cross signal is not input for 1 s successively.
• Causes:
• Remedy: Power source PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Power source PWB (YC105) and Main/ Engine PWB (YC20) 2. Replace the power source PWB. Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.

• Code: 6610
• Description: The fuser pressure release error The fuser release sensor does not turn on or off, after 30 s from starting pressurization or depressurization operation.
• Causes:
• Remedy: Fuser unit 1. Check there is no paper jam. 2. Check if the fuser pressure can be reduced by inverse rotation of the fuser gear by hand. 3. Check if the envelope sensor light is blocked out by the actuator during depressurization operation. 4. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit (Envelope sensor) and Exit PWB (YC2) Exit PWB (YC1) and Main/Engine PWB (YC11) 5. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 6. Replace the fuser unit. Fuser motor 1. Check if the fuser motor is rotating. 2. When turning the power on, check if the fuser motor rotates reversely. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser motor and Engine relay PWB (YC20) 4. If the wiring is disconnected, short-circuited or has ground fault, replace the wire. 5. Replace the fuser motor. Exit PWB Replace the Exit PWB. Engine relay PWB Replace the engine relay PWB. Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.

• Code: 6910
• Description: Engine firmware unexpected error The drum motor drive continued more than 60 minutes except during printing. (engine lock) The charge bias is turned off, during the developer bias is on. If the writing operation to the EEPROM is locked for 30 sec. Fuser temperature is abnormal, for more than a predetermined time.
• Causes: Main/Engine PWB
• Remedy: 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug the power cord and then turn on the power switch. 2. Check if the Main/Engine PWB is properly secured with screws. (Grounding check) 3. Check that the connectors on the Main/ Engine PWB are properly connected, and if not, re-connect them. 4. Check the engine firmware and upgrade to the latest version if necessary. 5. Replace the Main/Engine PWB.

• Code: 7001
• Description: Toner motor K error During driving the toner motor, an over-current detection signal is detected for 40 ms successively. When detected during warming up The message of "Shake the toner container (K)" is displayed. (exited by the opening and closing of the inner tray) Repeat the operation above, for three times. Four times or more, if an over-current detection signal is detected for 5 s successively, a service call error message appears.
• Causes:
• Remedy: Toner container Black 1. Check that the spiral of the toner container can be rotated by hand 2. Replace the toner container. Drive transmission system for the toner motor 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check broken couplings and gears, and replace if any. Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by other component, or has defect conduction, replace it. Toner motor and Engine relay PWB (YC18) Engine relay PWB (YC1) and Main/Engine PWB (YC4) Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor. Engine relay PWB Replace the engine relay PWB. Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.

• Code: 7002
• Description: Toner motor C error During driving the toner motor, an over-current detection signal is detected for 40 ms successively. When detected during warming up The message of "Shake the toner container (C)" is displayed. (exited by the opening and closing of the inner tray) Repeat the operation above, for three times. Four times or more, if an over-current detection signal is detected for 5 s successively, a service call error message appears.
• Causes:
• Remedy: Toner container Cyan 1. Check that the spiral of the toner container can be rotated by hand 2. Replace the toner container. Drive transmission system for the toner motor 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check broken couplings and gears, and replace if any. Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by other component, or has defect conduction, replace it. Toner motor and Engine relay PWB (YC18) Engine relay PWB (YC1) and Main/Engine PWB (YC4) Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor. Engine relay PWB Replace the engine relay PWB. Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.

• Code: 7003
• Description: Toner motor M error During driving the toner motor, an over-current detection signal is detected for 40 ms successively. When detected during warming up The message of "Shake the toner container (M)" is displayed. (exited by the opening and closing of the inner tray) Repeat the operation above, for three times. Four times or more, if an over-current detection signal is detected for 5 s successively, a service call error message appears.
• Causes:
• Remedy: Toner container Magenta 1. Check that the spiral of the toner container can be rotated by hand 2. Replace the toner container. Drive transmission system for the toner motor 1. Check if the couplings and gears rotate smoothly, and if not, clean or grease the gears. 2. Check broken couplings and gears, and replace if any. Defective connector cable or poor contact in the connector 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by other component, or has defect conduction, replace it. Toner motor and Engine relay PWB (YC18) Engine relay PWB (YC1) and Main/Engine PWB (YC4) Toner motor 1. Check how the toner motor is attached. 2. Replace the toner motor. Engine relay PWB Replace the engine relay PWB. Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the Main/Engine PWB.