• Code: 6200
• Description: Broken fuser heater wire (Sub)
  Fuser thermistor 1 does not reach primary stable temperature even after 30 s during warming up. Fuser thermistor 1 detects a temperature lower than 100°C/212°F for 60 s during ready.
• Causes: Fuser unit. Main/Engine PWB. Fuser thermistor 1
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and main/engine PWB (YC14) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit and execute U167 counter clear.
  Main/Engine PWB 1. Check the main/engine software and upgrade to the latest, if necessary. 2. Replace the main/engine PWB.
  Fuser thermistor 1 1. Replace the Fuser unit and execute U167 counter clear.

• Code: 6220
• Description: Abnormally high fuser thermistor 1 temperature (Edge)
  Fuser thermistor 1 detects a temperature higher than 230°C/446°F.
• Causes: Fuser unit. Main/Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and main/engine PWB (YC14) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit and execute U167 counter clear.
  Main/Engine PWB 1. Check the main/engine software and upgrade to the latest, if necessary. 2. Replace the main/engine PWB.

• Code: 6230
• Description: Broken fuser thermistor 1 wire (Edge)
  Input from fuser thermistor 1 is 1012 or more (A/D value) continuously for 5 s. Input from fuser thermistor 1 is1012 (A/D value) or more whenthe temperature at the fuser thermistor 2 is 70°C/ 158°F or more.
• Causes: Fuser unit. Main/Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and main/engine PWB (YC14) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit and execute U167 counter clear.
  Main/Engine PWB 1. Check the main/engine software and upgrade to the latest, if necessary. 2. Replace the main/engine PWB.

• Code: 6400
• Description: Zero-cross signal error
  While fuser heater ON/OFF control is performed, the zerocross signal is not input within 3 s.
• Causes: Fuser unit.
• Remedy: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB (CN2) and main/ engine PWB (YC14) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the power source PWB.

• Code: 7100
• Description: Toner sensor error
  Sensor output value of 8 or less.
• Causes: Toner sensor. Toner motor. Main/Engine PWB.
• Remedy: Toner sensor 1. Check the toner sensor output by U150. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner sensor and main/engine PWB (YC9) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Check that the gears of the Developer unit are not damaged and the spiral can rotate. 5. Replace the Developer unit.
  Toner motor 1. Draw out the toner container and execute U135 to check the toner motor operation. 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor and main/engine PWB (YC12) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor.
  Main/Engine PWB 1. Check the main/engine software and upgrade to the latest, if necessary. 2. Replace the main/engine PWB.

• Code: 7800
• Description: Broken temperature sensor wire
  Input from temperature sensor is 0.3 V (A/D value) or less
• Causes: Outer temperature sensor. Main/Engine PWB.
• Remedy: Outer temperature sensor 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Temperature sensor and main/engine PWB (YC6) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the temperature sensor.
  Main/Engine PWB 1. Check the main/engine software and upgrade to the latest, if necessary. 2. Replace the main/engine PWB.

• Code: 7810
• Description: Short-circuited temperature sensor wire
  Input from temperature sensor is 0.3 V (A/D value) or more
• Causes: Outer temperature sensor. Main/Engine PWB.
• Remedy: Outer temperature sensor 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Temperature sensor and main/engine PWB (YC6) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the temperature sensor.
  Main/Engine PWB 1. Check the main/engine software and upgrade to the latest, if necessary. 2. Replace the main/engine PWB.

• Code: 7900
• Description: Drum EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively.
• Causes: DR PWB. Main/Engine PWB.
• Remedy: DR PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. DR PWB and main/engine PWB (YC9) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Drum unit.
  Main/Engine PWB 1. Check the main/engine software and upgrade to the latest, if necessary. 2. Replace the main/engine PWB.