• Code: C3726
• Description: Fusing abnormally high temperature detection (Middle of the heating roller) The heating roller thermistor/2 continues to detect a temperature higher than a predetermined one for a predetermined period of time.
• Causes: • Fusing unit • Heating roller thermistor/2 (TH2) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. 4 Replace the fusing unit 5 Replace IHPU 6 Replace PRCB 7 Replace NF1

• Code: C3822
• Description: Fusing abnormally low temperature detection (Edge of the heating roller) The heating roller thermistor/3 continues to detect a temperature lower than a predetermined one for a predetermined period of time.
• Causes: • Fusing unit • Heating roller thermistor/3 (TH3) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. 4 Replace the fusing unit 5 Replace IHPU 6 Replace PRCB 7 Replace NF1

• Code: C3825
• Description: Fusing abnormally low temperature detection (Main of the heating roller) The heating roller temperature sensor/4 continues to detect a temperature lower than a predetermined one for a predetermined period of time.
• Causes: • Fusing unit • Heating roller temperature sensor/4 (TEMS4) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. 4 Replace the fusing unit 5 Replace IHPU 6 Replace PRCB 7 Replace NF1

• Code: C3903
• Description: Thermostat tripping During warm-up, the thermostat tripping detection signal continues to be H for the set period of time.
• Causes: • Fusing unit • Heating roller thermostat (TS1) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. 4 Replace the fusing unit 5 Replace IHPU 6 Replace PRCB 7 Replace NF1

• Code: C3922
• Description: • Fusing sensor wire breaks detection (Edge of the heating roller) • Fusing unit for incorrect marketing area (The fusing unit for incorrect marketing area is installed) After a predetermined period of time after the warm-up stage is started, the heating roller thermistor/3 voltage does not change by predetermined steps within a predetermined period of time.
• Causes: • Fusing unit • Heating roller thermistor/3 (TH3) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. 4 Check the marketing area of the fusing unit. If the marketing area is incorrect, replace the fusing unit for proper marketing area. 5 Replace the fusing unit 6 Replace IHPU 7 Replace PRCB 8 Replace NF1

• Code: C3925
• Description: Fusing sensor wire breaks detection (Center of the heating roller) After a predetermined period of time after the warm-up stage is started, the heating roller temperature sensor/4 voltage does not change by predetermined steps within a predetermined period of time.
• Causes: • Fusing unit • Heating roller temperature sensor/4 (TEMS4) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. 4 Check the marketing area of the fusing unit. If the marketing area is incorrect, replace the fusing unit for proper marketing area. 5 Replace the fusing unit 6 Replace IHPU 7 Replace PRCB 8 Replace NF1

• Code: C3926
• Description: • Fusing sensor wire breaks detection (Middle of the heating roller) • Fusing unit for incorrect marketing area (The fusing unit for incorrect marketing area is installed) After a predetermined period of time after the warm-up stage is started, the heating roller thermistor/2 voltage does not change by predetermined steps within a predetermined time.
• Causes: • Fusing unit • Heating roller thermistor/2 (TH2) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary. 4 Check the marketing area of the fusing unit. If the marketing area is incorrect, replace the fusing unit for proper marketing area. 5 Replace the fusing unit 6 Replace IHPU 7 Replace PRCB 8 Replace NF1

• Code: C392A
• Description: Heating roller temperature sensor/4 contamination (Center of the heating roller) While checking the contamination on the heating roller temperature sensor/4, detected temperature of the heating roller thermistor/1 exceeded the detected temperature of the heating roller temperature sensor/4 for over the predetermined value for the predetermined period of time.
• Causes: • Fusing unit • Heating roller temperature sensor/4 (TEMS4) • Heating roller thermistor/1 (TH1) • IH power supply (IHPU) • DC power supply (DCPU) • Printer control board (PRCB)
• Remedy: 1 Wipe the TEMS4 clean of dirt if any. <Cleaning procedure> • Clear away a dirt or a foreign object on the sensor with a cotton swab. • When a dirt is left even if you cleaned the sensor by above procedure, clear away a dirt or a foreign object on the sensor using a cotton swab dampened with the alcohol. And, wipe off the sensor with a dry cotton swab afterwards. 2 Check the TEMS4 for installed position and proper connector connection. 3 Check the TH1 for installed position and proper connector connection. 4 Check the connection of the fusing unit. 5 Check the fusing unit, IHPU, PRCB and DCPU for proper connection and correct or change as necessary. 6 Replace the fusing unit 7 Replace PRCB