• Code: C-3905
• Description: Thermistor /1 (TH1) low temperature abnormality 1 (hardware). TH1 detects the fusing abnormality detection signal 3.
• Causes: Fusing temperature sensor /1 (TH1) Fusing heater lamp /1 (L1) Fusing heater lamp /2 (L2) Printer control board (PRCB) AC drive board (ACDB)
• Remedy: 1 Check the fusing rollers /Up (L1 and L2), and clean/repair them if any abnormality. 10-N 2 Check the connector connection and the wiring between PRCB and TH1, and repair it if any abnormality. - 3 Check the connector connection and the wiring between ACDB and L1/L2, and repair it if any abnormality. - 4 Check TH to see the installed position or distance to the fusing roller /Up, and adjust/ replace it if any abnormality. 14-F 5 Replace TH1. - 6 Replace L1 and L2. - 7 Replace PRCB. - 8 Replace ACDB. - *After replacing the defective parts, be sure to set the DIPSW 3-1 to 0. If DIPSW3-1 is set to 0 before defective parts are fixed, it causes fire.

• Code: C-3906
• Description: Thermistor /3 (TH3) high temperature abnormality (hardware). TH3 detects the fusing abnormality detection 6
• Causes: Fusing temperature sensor /3 (TH3) Fusing heater lamp /3 (L3) Printer control board (PRCB) AC drive board (ACDB)
• Remedy: 1 Check the fusing heating roller /Up (L3), and repair it if any abnormality. 10-N 2 Check the connector connection and the wiring between PRCB and TH1, and repair it if any abnormality. - 3 Check the connector connection and the wiring between ACDB and L3, and repair it if any abnormality. - 4 Check TH3 installed condition or the distance between TH3 and the fusing roller /Up, and adjust/replace it if any abnormality. 13-F 5 Replace TH3. - 6 Replace L3. - 7 Replace PRCB. - 8 Replace ACDB. - * After replacing the defective parts, be sure to set the DIPSW 3-1 to 0. DIPSW3-1 is set to 0 before defective parts are fixed, it causes fire.

• Code: C-4301
• Description: Image processing cooling fan (FM12) rotation abnormality + 24V power abnormality. The abnormal status is detected twice in succession after FM12 was turned ON. At this time, an error detection signal (24V cut off) is detected.
• Causes: DC power supply /2 (DCPS /2) AC drive board (ACDB)
• Remedy: 1 Check the connector connection and the wiring between ACDB and DCPS /2, and repair it if any abnormality. - 2 Replace DCPS /2. - 3 Replace ACDB.

• Code: C-4302
• Description: Image processing cooling fan (FM12) power abnormality. The FM12EM error detection signal is detected twice in succession within a specified period of time after FM12 was turned ON. At this time, 24V is normal, but an error detection signal (blowout of ICP) is detected
• Causes: Image processing cooling fan (FM12) AC drive board (ACDB)
• Remedy: 1 Check the connector connection and the wiring between ACDB and the fun, and repair it if any abnormality. - 2 Rotate the fan by I/O or hand, and repair/replace it if any abnormality. 7-L 3 Replace FM12 and ACDB at a time.

• Code: C-4303
• Description: Image processing cooling fan (FM12) rotation abnormality 1. The FM12EM error detection signal is detected twice in succession within a specified period of time after FM12 was turned ON. However, error detection signals (24V cut off/blowout of ICP) are not detected.
• Causes: Image processing cooling fan (FM12) Printer control board (PRCB) AC drive board (ACDB)
• Remedy: 1 Check the connector connection and the wiring between PRCB and the fun, and repair it if any abnormality. - 2 Check the connector connection and the wiring between ACDB and the fun, and repair it if any abnormality. - 3 Rotate the fan by I/O or hand, and repair/replace it if any abnormality. 7-L 4 Replace FM12. - 5 Replace PRCB. - 6 Replace ACDB.

• Code: C-4304
• Description: Image processing cooling fan (FM12) rotation abnormality 2. When the print is started, the EM signal of FM12 turns ON.
• Causes: Image processing cooling fan (FM12) Printer control board (PRCB) AC drive board (ACDB)
• Remedy: 1 Check the connector connection and the wiring between PRCB and the fun, and repair it if any abnormality. - 2 Check the connector connection and the wiring between ACDB and the fun, and repair it if any abnormality. - 3 Rotate the fan by I/O or hand, and repair/replace it if any abnormality. 7-L 4 Replace FM12. - 5 Replace PRCB. - 6 Replace ACDB.

• Code: C-4305
• Description: LPH fan (FM3) rotation abnormality + 24V power abnormality. The abnormal status is detected twice in succession after FM3 was turned ON. At this time, an error detection signal (24V cut off) is detected.
• Causes: DC power supply /2 (DCPS /2) AC drive board (ACDB)
• Remedy: 1 Check the connector connection and the wiring between ACDB and DCPS /2, and repair it if any abnormality. - 2 Replace DCPS /2. - 3 Replace ACDB.

• Code: C-4306
• Description: LPH fan (FM3) power abnormality. The FM3EM error detection signal is detected twice in succession within a specified period of time after FM3 was turned ON. At this time, 24V is normal, but an error detection signal (blowout of ICP) is detected.
• Causes: LPH fan /1 (FM3) AC drive board (ACDB)
• Remedy: 1 Check the connector connection and the wiring between ACDB and the fun, and repair it if any abnormality. - 2 Rotate the fan by I/O or hand, and repair/replace it if any abnormality. 5-L 3 Replace FM3 and ACDB at a time.