• Code: C410
• Description: Fuser unit related service call Thermistor or heater abnormality at power-ON: Abnormality of service call the thermistor is detected when power is turned ON or the temperature of the fuser roller does not rise in a specified period of time after power is turned ON.
• Causes: LGC board
• Remedy: 1. Check the thermistors 1. Check if the connectors are disconnected. 2. Check if the center, side and edge thermistors are in contact with the surface of the fuser roller properly? 3. Check if the center, side and edge thermistors are not deformed or dirty. 4. Check if the harnesses of the center, side and edge thermistors are open circuited. 2. Check the heater 1. Check if the heater is broken. 2. Check if the connector of the heater is disconnected. 3. Check if the harnesses are connected properly to the terminals of the heater lamp. 4. Check if the thermostat is blown. 3. Check the LGC board 1. Check if the connectors CN308 are disconnected. 2. Check if the conductor pattern on the LGC board is short circuited or open circuited. 3. Replace the LGC board. 4. Clear the status counter After repairing the matter which caused the error [C410], perform the following: 1. Turn ON the power while [0] and [8] are pressed simultaneously. 2. Key in "2002", then press [START]. 3. Change the current status counter value "1" or "2" to "0", then press [OK] or [INTERRUPT] (to cancel [C410]). 4. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C430
• Description: Fuser unit related service call Thermistor abnormality: Abnormality of the thermistor is detected after a specified period of time has passed from power-ON (including ready state).
• Causes: Switching regulator
• Remedy: 1. Check the thermistors 1. Check if the connectors are disconnected. 2. Check if the center, side and edge thermistors are in contact with the surface of the fuser roller properly? 3. Check if the center, side and edge thermistors are not deformed or dirty. 4. Check if the harnesses of the center, side and edge thermistors are open circuited. 2. Check the heater 1. Check if the heater is broken. 2. Check if the connector of the heater is disconnected. 3. Check if the harnesses are connected properly to the terminals of the heater lamp. 4. Check if the thermostat is blown. 3. Check the LGC board 1. Check if the connectors CN308 are disconnected. 2. Check if the conductor pattern on the LGC board is short circuited or open circuited. 3. Replace the LGC board. 4. Check the ground connection of the heat roller 1. Check if the fuser unit is tightly screwed to the equipment with no gap. Notes: • Tighten the screws while pressing the fuser unit with your hand. • Using a driver is reccomended to fix the fuser unit. 2. Check if the grounding leaf spring in the fuser unit is in contact due to deformation. Fig.8-1 5. Check the power supply Replace the switching regulator. 6. Clear the status counter • Change the current status counter value (08-2002) "4" to "0" for [C430] and "5", "7" or "9" to "0" for [C440], taking the same procedure as that for [C410]. * The status counter value is as follows in the following c ases. Change them to “0” respectively. - The error occurred during warming-up: “4” or “5” - The error occurred after the equipment has become ready: “7” - The temperature detected by the center thermistor is 240°C or higher: “9” - The temperature detected by the side thermistor is 240°C or higher: “9” - The temperature detected by the edge thermistor is 240°C or higher: “9” only during printing.

• Code: C440
• Description: Fuser unit related service call Fuser roller abnormality: The temperature of the fuser roller has exceeded the range of control or does not even reach the range.
• Causes: Switching regulator
• Remedy: 1. Check the thermistors 1. Check if the connectors are disconnected. 2. Check if the center, side and edge thermistors are in contact with the surface of the fuser roller properly? 3. Check if the center, side and edge thermistors are not deformed or dirty. 4. Check if the harnesses of the center, side and edge thermistors are open circuited. 2. Check the heater 1. Check if the heater is broken. 2. Check if the connector of the heater is disconnected. 3. Check if the harnesses are connected properly to the terminals of the heater lamp. 4. Check if the thermostat is blown. 3. Check the LGC board 1. Check if the connectors CN308 are disconnected. 2. Check if the conductor pattern on the LGC board is short circuited or open circuited. 3. Replace the LGC board. 4. Check the ground connection of the heat roller 1. Check if the fuser unit is tightly screwed to the equipment with no gap. Notes: • Tighten the screws while pressing the fuser unit with your hand. • Using a driver is reccomended to fix the fuser unit. 2. Check if the grounding leaf spring in the fuser unit is in contact due to deformation. Fig.8-1 5. Check the power supply Replace the switching regulator. 6. Clear the status counter • Change the current status counter value (08-2002) "4" to "0" for [C430] and "5", "7" or "9" to "0" for [C440], taking the same procedure as that for [C410]. * The status counter value is as follows in the following c ases. Change them to “0” respectively. - The error occurred during warming-up: “4” or “5” - The error occurred after the equipment has become ready: “7” - The temperature detected by the center thermistor is 240°C or higher: “9” - The temperature detected by the side thermistor is 240°C or higher: “9” - The temperature detected by the edge thermistor is 240°C or higher: “9” only during printing.

• Code: C450
• Description: Fuser unit related service call Thermistor abnormality during printing: Abnormality of the thermistor is detected during printing.
• Causes: LGC board
• Remedy: 1. Check the edge thermistor 1. Check if the connector is disconnected. 2. Check if the edge thermistor is in contact with the surface of the fuser roller properly. 3. Check if the harness of the edge thermistor is open circuited. 2. Check the LGC board 1. Check if the connector CN308 is disconnected. 2. Check if the conductor pattern on the board is short circuited or open circuited. 3. Replace the LGC board. 3. Clear the status counter 1. Change the current status counter value (08-2002) "6" to "0".

• Code: C4C0
• Description: Fuser unit related service call Fuser unit new/old detection fuse abnormality
• Causes: Fuser unit. PC board
• Remedy: 1. Check the fuser unit. 1. Are the connectors disconnected? 2. Are the harnesses open circuited? 3. Replace the fuser unit. 2. Check the PC board 1. Are the connectors disconnected? 2. Are the harnesses short circuited or open circuited? 3. Replace the board.

• Code: C550
• Description: RADF I/F error: Communication error has occurred between the RADF and the scanner.
• Causes: RADF board SLG board
• Remedy: RADF board • Check if the harness connecting the RADF board and SLG board is disconnected or open circuited. • Check if the conductor pattern on the RADF board is short circuited or open circuited. SLG board Check if the conductor pattern on the SLG board is short circuited or open circuited.

• Code: C551
• Description: Document feeder model detection error: An optional document feeder that is not compatible to this equipment is installed.
• Causes:
• Remedy: RADF Check if the installed RADF is an option exclusively set for the model. Replace the RADF with the one exclusively set for the model.

• Code: C570
• Description: Communication error between Engine-CPU and CNV board
• Causes: LGC board CNV board
• Remedy: LGC board • Check if the LGC board and CNV board are connected properly. • Check if the conductor pattern on the LGC board is short circuited or open circuited. CNV board Check if the conductor pattern on the CNV board is short circuited or open circuited.