• Code: 6750
• Description: Fuser IH output over-current error
  The output current of IH CPU is higher than 90A for 10 ms in succession.
• Remedy: Fuser IH PWB: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser IH PWB( YC4) and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the fuser IH PWB.
  Fuser IH unit: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser IH unit and Fuser IH PWB (YC9 and 10) Fuser IH PWB( YC4) and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the fuser IH unit.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6760
• Description: Fuser IH input over-current error
  The input current of IH CPU is higher than 20A(100V/120V), 10A(200V) for 100 ms in succession.
• Remedy: Fuser IH PWB: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser IH PWB( YC4) and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the fuser IH PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6770
• Description: Fuser IH low electric power error
  Less than 0.6 times of the preset power is detected for 120 ms in succession after the IH heater remote has turned on.
• 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 Fuser IH PWB (YC6) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser IH unit.
  Fuser IH PWB: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser IH PWB( YC4) and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser IH PWB.
  Fuser IH unit: 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser IH unit and Fuser IH PWB (YC9 and 10) Fuser IH PWB( YC4) and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the fuser IH unit.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6900
• Description: Fuser belt cooling fan error
  When the fuser edge fan motor 1 , 2 is driven, alarm signal is detected for 5 s continuously.
• Remedy: Fuser edge fan motor 1, 2: 1. To check the fan motor operation, execute U037 Fuser Edge. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser edge fan motor 1 and Engine PWB (YC26) Fuser edge fan motor 2 and Fuser PWB (YC2) Fuser PWB (YC1) and Engine PWB (YC26) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the fuser unit and execute U167 counter clear.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6910
• Description: Engine software ready error
  The device won’t engage in ready state in 60 minutes after warming-up has began. (A previous timeout process has not been cancelled.)
• Remedy: Engine PWB: 1. Turn the main power switch off and after 5 seconds, turn it on. 2. Reinstall the engine software. 3. Replace the engine PWB.

• Code: 6920
• Description: Fuser front fan motor error
  When the fuser front fan motor is driven, alarm signal is detected for 5 s continuously.
• Remedy: Fuser front fan motor: 1. To check the fan motor operation, execute U037 IH Coil. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser front fan motor and Front PWB (YC4) Front PWB (YC3) and Engine PWB (YC7) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the fuser front fan motor.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6930
• Description: Fuser rear fan motor error
  When the fuser rear fan motor is driven, alarm signal is detected for 5 s continuously.
• Remedy: Fuser rear fan motor: 1. To check the fan motor operation, execute U037 Fuser Coling. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser rear fan motor and Engine PWB (YC26) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the fuser rear fan motor.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6940
• Description: IH PWB cooling fan motor error
  When the IH fan motor is driven, the alarm signal is detected for 5 s continuously.
• Remedy: IH fan motor: 1. To check the fan motor operation, execute U037 IH Pwb. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. IH fan motor and Feed PWB 1(YC11) Feed PWB 1(YC2) and Engine PWB (YC5) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the IH fan motor.
  Feed PWB 1: Replace the Feed PWB1.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB