• Code: C447, C449
• Description: Heater temperature abnormality after abnormality judgment
• Causes:
• Remedy: 1 Power voltage Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) 2 Thermistor • Check if the center and edge thermistor are installed properly. • Check if the harnesses of the center and edge thermistor are open circuited. • Check if the connectors of the center and edge thermistor are disconnected (CN306, J608). 3 Switching regulator and fuser unit • Is the fuser unit installed correctly? • Check if the IH-COIL is broken. • Check if the terminal of the IH-COIL is attached securely. • Check if the thermostat is blown • Check if the drawer connector is damaged or its connection is detected. • Check if the connectors of the power supply unit are disconnected (CN504, CN505, CN56, CN564, CN565). • Check if the power supply unit is abnormal. 4 LGC board • Check if the connectors CN306 and CN302 are disconnected. • Check if the conductor pattern on the LGC board is short circuited or open circuited. 5 Clear the status counter 1. Perform FS-08-2002. 2. Change the current status counter value "5", "6", "7", "9", "10", "22", "23", "24", "25", "27", "29", or "63 to 70". * The status counter value is as follows in the following cases. - The error occurred during warming-up: "5" or "6" The error occurred after the equipment has become ready: "7". - The temperature detected by the center thermistor is 220°C or higher, the temperature detected by the edge thermistor is 237°C or higher: "9", "10", "22", "23", "25", "27" or "29" - The error occurred during printing: "24", "25", or "64 to 70". - The error occurred during energy saving: "27". - A paper jam occurred: "29".

• Code: C471, C472
• Description: [C471] IH board initialization abnormality [C472] Power supply abnormality
• Causes: Side cover interlock switch. LGC board FIL board IH board. Power supply
• Remedy: Power supply • Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) Side cover interlock switch • Connector check (CN514, J519) • Harness check Fuser unit • Drawer connector check • Thermostat check • Unit check LGC board • Connector check (CN302, CN306) • Board check IH board • Connector check (CN561, CN562, CN563) • Board check Status counter 1. Perform FS-08-2002. Change the current status counter value "11" to "0". 2. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state. Connector and harness • Check the connectors and harnesses of the parts replaced just before C471 occurred. • Check the connectors which connect the equipment and LCF/PFP.

• Code: C473, C474
• Description: [C473] Surge pressure detection / power and voltage upper limit abnormality [C474] Power and voltage lower limit abnormalityThe power voltage supplied to the IH board is higher than upper limit (C473). The power voltage supplied to the IH board is lower than upper limit (C474)
• Causes: Power supply IH board LGC board
• Remedy: Power supply • Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) Fuser unit • Drawer connector check • Thermostat check • Unit check IH board • Connector check (CN561, CN562, CN563) • Board check LGC board • Connector check (CN302, CN306) • Board check Status counter 1. Perform FS-08-2002. Change the current status counter value "13" or "16" to "0". 2. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C480
• Description: IGBT high temperature abnormality/Thermistor breaking abnormality. 1. Perform FS-08-2002. Change the current status counter value "15" to "0". 2. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.
• Causes: IH board cooling fan LGC board IH board Power supply
• Remedy: IH board cooling fan • Fan motor check (Perform the output check: FS-03-442) • Connector check (J601) • Harness check LGC board • Connector check (CN302) • Harness check IH board • Connector check (CN561, CN562, CN563, CN564, CN565) • Harness check

• Code: C4B0
• Description: Fuser unit counter abnormality
• Causes: LGC board
• Remedy: LGC board • Check if the conductor pattern on the board is short circuited or open circuited. • Check if EEPROM is mounted. Status counter 1. Perform FS-08-2002. 2. Reset the displayed current status counter value "1 to 4", "8", "17 to 21", "26", "28", "30 to 62", or "67 or more" to "0". 3. Turn the power OFF and then back ON. Make sure that the equipment enters the normal status.

• Code: C4B1
• Description: Fuser unit voltage judgment abnormality. Errors in the IH board when the destination selection of the equipment is incorrect.
• Causes: LGC board IH board
• Remedy: LGC board • Connector check (CN302) • Board check IH board • Connector check (CN561, CN562, CN563) • Board check

• Code: C4C0
• Description: Fuser unit new/old detection fuse abnormality
• Causes: Fuser unit LGC board
• Remedy: Fuser unit • Connector check (J608) • Check if the harness of fuser unit new/old detection fuse is caught or open circuited / short circuited. Fig.8-3 • Unit check LGC board • Connector check (CN306) • Harness check • Board check

• Code: C4E0, C4E1
• Description: [C4E0] Fuser pressure roller release abnormality [C4E1] Fuser pressure roller contact/semi-contact abnormality. The releasing behavior of the pressure roller cannot be detected/the abnormality of the sensor of the fuser unit. (C4E0) The contacting/semi-contacting behavior of the pressure roller cannot be detected/the abnormality of the sensor of the fuser unit. (C4E1
• Causes: Pressure roller contact/release detection sensor Pressure roller contact/release motor LGC board
• Remedy: Pressure roller contact/release detection sensor (S29) • Sensor check (Perform the input check: FS-03-[F3]ON/[2]/[H]) • Connector check (CN306, J605) • Harness check Pressure roller contact/release motor (M13) ¡E Motor check (Perform the output check: FS-03-272) ¡E Connector check (CN305, J602) ¡E Harness check Fuser unit ¡E Drawer connector check ¡E Thermostat check ¡E Unit check Check if the adjustment value for the tilting of the fuser unit is aligned to the uppermost line of the scale. Refer to P. 8-371 "8.5.36 Image Skewing on Paper Trailing Edge". LGC board E Connector check (CN305, CN306) ¡E Board check