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ERROR CODE AND TROUBLESHOOTING
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6.2.14 Fuser unit related service call
[C411/C412] Thermistor/heater lamp abnormality at power-ON
1.Check the power voltage
(1) Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated
voltage?)
2.Check the thermopiles
(1) Check if the fuser belt center and side thermopiles (front, rear) are installed properly.
(2) Check if the harnesses of the fuser belt center and side thermopiles (front, rear) are open
circuited.
3. Check the power supply unit and fuser unit
(1) Is the fuser unit installed correctly?
(2) Check if the heater lamp is broken.
(3) Check if the connector of the heater lamp is disconnected.
(4) Check if the thermostat is blown.
(5) Check if the connectors of the power supply unit are disconnected (power supply unit AC output
connector CN408, CN409 and LGC I/F connector CN404 CN405).
(6) Check if the power supply unit is abnormal.
• Replace the power supply unit.
4. Check the LGC board
(1) Check if the connectors CN333, CN345 and CN361 are disconnected.
(2) Check if the conductor pattern on the LGC board is short circuited or open circuited.
(3) Replace the LGC board.
5. Clear the status counter
After repairing the matter which caused the error [C411/C412], perform the following:
(1) Turn ON the power while [0] and [8] are pressed simultaneously.
(2) Key in “400”, then press [START].
(3) Change the current status counter value “1” or “2” to “0”, then press [ENTER] or [INTERRUPT]
(to cancel [C411/C412]).
(4) Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready
state.
Be sure to turn OFF the power and unplug the power cable beforehand when checking the power supply
unit and fuser unit.
The fuser unit itself or the part of the unit remains heated and the capacitors are still charged after a while
the power cable is unplugged. So make sure the unit is cooled down enough before checking.
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