• Code: C3A1
• Description: Auto-toner sensor-M abnormality (lower limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: Developer unit mixer motor-K/YMC • Motor check (Perform the output check: K: 03-114 TMC: 03-115) EPU tray (process unit) • Connection check (05-2788) • Connector check • Harness check EPU board • Connector check (CN550, CN551, CN553,CN554, CN555, CN556) • Board check LGC board • Connector check (CN308, CN310) • Board check

• Code: C3A2
• Description: Auto-toner sensor-M connection error
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: Developer unit mixer motor-K/YMC • Motor check (Perform the output check: K: 03-114 TMC: 03-115) EPU tray (process unit) • Connection check (05-2788) • Connector check • Harness check EPU board • Connector check (CN550, CN551, CN553,CN554, CN555, CN556) • Board check LGC board • Connector check (CN308, CN310) • Board check

• Code: C3B0
• Description: Auto-toner sensor-Y abnormality (upper limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: Developer unit mixer motor-K/YMC • Motor check (Perform the output check: K: 03-114 TMC: 03-115) EPU tray (process unit) • Connection check (05-2788) • Connector check • Harness check EPU board • Connector check (CN550, CN551, CN553,CN554, CN555, CN556) • Board check LGC board • Connector check (CN308, CN310) • Board check

• Code: C3B1
• Description: Auto-toner sensor-Y abnormality (lower limit)
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: Developer unit mixer motor-K/YMC • Motor check (Perform the output check: K: 03-114 TMC: 03-115) EPU tray (process unit) • Connection check (05-2788) • Connector check • Harness check EPU board • Connector check (CN550, CN551, CN553,CN554, CN555, CN556) • Board check LGC board • Connector check (CN308, CN310) • Board check

• Code: C3B2
• Description: Auto-toner sensor-Y connection error
• Causes: Auto-toner sensor-K/-C/-M/-Y Developer unit mixer motor-K/YMC EPU board LGC board
• Remedy: Developer unit mixer motor-K/YMC • Motor check (Perform the output check: K: 03-114 TMC: 03-115) EPU tray (process unit) • Connection check (05-2788) • Connector check • Harness check EPU board • Connector check (CN550, CN551, CN553,CN554, CN555, CN556) • Board check LGC board • Connector check (CN308, CN310) • Board check

• Code: C3C0
• Description: Process unit connection error
• Causes: EPU board LGC board
• Remedy: EPU tray (process unit) • Connection check (05-2788) • Connector check • Harness check EPU board • Connector check (CN551) • Board check LGC board • Connector check (CN308) • Board check

• Code: C411
• Description: Thermistor or IH abnormality at power-ON
• Causes: Thermopiles Fuser unit IH coil IH board LGC board
• Remedy: Power voltage • Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) Error detection history Check the error detection history of each temperature detecting element when the error occurred. If any of the elements detects an abnormal temperature, check step 3. • 08-4530: Fuser belt center thermopile temperature • 08-4532: Fuser belt edge thermistor temperature • 08-4533: Pressure roller center thermistor temperature • 08-4545: Pressure roller rear thermistor temperature Thermopiles • Check if the fuser belt center and side thermopiles (front, rear) are installed properly. • Check if the harnesses of the fuser belt center and side thermopiles (front, rear) are open circuited. Fuser unit • Unit check • Connector check • Harness check IH coil • Connector check • Harness check IH board • Connector check • Harness check LGC board • Connector check (CN305, CN306) • Harness check Status counter 1. [0], [8] Power ON. 2. Key in “2002”, 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.

• Code: C412
• Description: Thermistor/IH abnormality at power-ON
• Causes: Thermopiles Fuser unit IH coil IH board LGC board
• Remedy: Power voltage • Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) Error detection history Check the error detection history of each temperature detecting element when the error occurred. If any of the elements detects an abnormal temperature, check step 3. • 08-4530: Fuser belt center thermopile temperature • 08-4532: Fuser belt edge thermistor temperature • 08-4533: Pressure roller center thermistor temperature • 08-4545: Pressure roller rear thermistor temperature Thermopiles • Check if the fuser belt center and side thermopiles (front, rear) are installed properly. • Check if the harnesses of the fuser belt center and side thermopiles (front, rear) are open circuited. Fuser unit • Unit check • Connector check • Harness check IH coil • Connector check • Harness check IH board • Connector check • Harness check LGC board • Connector check (CN305, CN306) • Harness check Status counter 1. [0], [8] Power ON. 2. Key in “2002”, 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.