• Code: SC 391-01
• Description: Charge AC: output error 391-01: K 391-02: Y 391-03: M 391-04: C The high voltage supply board sends the feedback signal (CN228-2 to 5; MCYK). The BCU monitors these feedback signals every 8 ms. If the average of the sampled data is not within the control target 30 consecutive times, this SC code is generated.
• Causes: • Power pack disconnected • Charge receptacle or terminal • Defective PCU bias input terminal • Incorrect power pack B/C output • Damaged cable • Defective BCU
• Remedy: 1. Turn the main switch off and on. 2. Check the connector. 3. Check the PCU charge voltage input (the spring/conducting shaft) or replace the PCU. 4. Replace the power pack B/C. 5. Replace the cable. 6. Replace the BCU.

• Code: SC 392-001
• Description: Air pump motor error 391-001: MY 391-002: CK Three consecutive errors are detected in motor-driver-signal samples. The samples are collected every 0.01 second.
• Causes: • Damaged cable • Short circuit • Defective motor
• Remedy: 1. Turn the main switch off and on. 2. Replace the air pump. 3. Check the circuit.

• Code: SC 440-001
• Description: Drum motor error 440-001: Black 440-002: Color No drum gear position sensor signal is detected within 0.7 second (185 mm/s), 1.0 second (125 mm/s), or 2.0 seconds (62.5 mm/s).
• Causes: • Defective PCU • Defective drum motor • Defective drum gear position sensor
• Remedy: 1. Turn the main switch off and on. 2. Check and/or replace the PCU. 3. Check and/or replace the sensor.

• Code: SC 460-001
• Description: Thermistor 1 error (open circuit) When the temperature detected by thermistor 1, which is at the left (fusing unit) side of the laser optics unit, is less than -30°C for 10 seconds consecutively, the BCU determines that the circuit is opened and displays this SC code.
• Causes: • Thermistor 1 defective • Cable connection error • BCU defect
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connections. 3. Replace the thermistor. 4. Replace the BCU.

• Code: SC 460-002
• Description: Thermistor 1 error (short circuit) When the temperature detected by the thermistor 1, which is at the left (fusing unit) side of the laser optics unit, is higher than 70°C for 10 seconds consecutively, the BCU determines that the circuit is shorted and displays this SC code
• Causes: • Thermistor 1 defective • Cable connection error • BCU defect
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connections. 3. Replace the thermistor. 4. Replace the BCU.

• Code: SC 461-001
• Description: Thermistor 2 error (open circuit) When the temperature detected by the thermistor 2, which is at the right (paper feed section) side of the laser optics unit, is less than -30°C for 10 seconds consecutively, the BCU determines that the circuit is opened and displays this SC code.
• Causes: • Thermistor 2 defective • Cable connection error • BCU defect
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connections. 3. Replace the thermistor. 4. Replace the BCU.

• Code: SC 461-002
• Description: Thermistor 2 error (short circuit) When the temperature detected by the thermistor 2, which is at the right (paper feed section) side of the laser optics unit, is higher than 70°C for 10 seconds consecutively, the BCU determines that the circuit is shorted and displays this SC code
• Causes: • Thermistor 2 defective • Cable connection error • BCU defect
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connections. 3. Replace the thermistor. 4. Replace the BCU.

• Code: SC 471
• Description: Transfer belt H.P. error The transfer belt HP sensor signal does not change from Low to High (home position) or vice versa 1 second after the transfer belt contact motor turns on.
• Causes: • Transfer belt unit not set properly • Defective transfer belt H.P. sensor and/or transfer belt sensor • Defective transfer belt contact motor • Transfer belt unit problem
• Remedy: 1. Turn the main switch off and on. 2. Reset the transfer belt unit. 3. Clean or replace the transfer belt sensor. 4. Replace the transfer belt contact motor. 5. Check the contact and release mechanism of the transfer belt unit.