• 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: 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 Cooling. 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.

• Code: 6950
• Description: Fuser IH PWB communication error No response is received in 30 ms since a command is sent to IHCPU. A checksum error is detected 10 times in succession.
• Remedy: Power source PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB (YC9) and Feed PWB 1(YC4) Power source PWB (YC3) and Fuser IH PWB (YC1) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the +24V output is not given by the power source PWB (YC9), replace the power source PWB.
  Feed PWB 1 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB (YC3) and Fuser IH PWB (YC1) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the +24V output is not given by the feed PWB1 (YC27), replace the feed PWB1.
  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: 6960
• Description: Current PWB error The power current is greater than 1A for 5 seconds continuously despite that 500W was indicated as the fuser power during power-up. * : 220-240 V model only
• Remedy: Current PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Current PWB(YC17) and Feed PWB2 (YC13) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Current PWB.

• Code: 6980
• Description: Fuser 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. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• 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 Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.