• Code: 552
• Description: Fusing temperature warm-up error (rear)
  The fusing temperature rises less than 7 degrees in 2 seconds, and this continues 5 times consecutively. The fusing temperature is not detected in 25 or 35 seconds.
• Causes: - Fusing thermistor defective or out of position
  - Fusing lamp open
  - Power supply board defective

• Code: 553
• Description: Fusing overheat error (rear)
  The fusing temperature is over 230°C for 1 second (detected by the thermistor).
• Causes: - Fusing thermistor defective
  - Power supply board defective

• Code: 555
• Description: Fusing lamp overheat error (rear)
  After the fusing temperature reaches the target temperature, the fusing lamp does not turn off for 20 consecutive seconds.
• Causes: - Fusing thermistor defective or out of position
  - Power supply board defective

• Code: 556
• Description: Unstable fusing temperature (rear)
  The fusing temperature varies 50° C or more within 1 second, and this occurs 2 consecutive times.
• Causes: - Thermistor defective or out of position
  - Power supply unit defective

• Code: 559
• Description: Jam error detected 3 times in succession
  The exit sensor and the duplex sensor detect a paper jam 3 times in succession This condition can occur when SP 1159 1 is set to 'on'. The default is 'off'.
• Causes: - Paper jams can occur for the following reasons.
  - Dampness
  - Paper curl
  - Incorrect paper setting in the paper tray
  - Stripper pawls coming apart

• Code: 590
• Description: Left exhaust fan motor error
  The CPU detects an exhaust fan lock signal for more than 5 seconds.
• Causes: - Loose connection of the exhaust fan motor
  - Too much load on the motor drive

• Code: 621
• Description: ADF connection error
  An incorrect ADF (an ADF for some other copier) is detected.
• Causes: ADF incorrect (The ADF for B039/B040/B043 or B121/B122/B123 is installed on this machine.)

• Code: 760
• Description: ADF gate abnormal 1
  The ADF Gate signal line between the ADF main board and the BICU is disconnected.
• Causes: - ADF main board defective
  - Input/output board defective
  - Poor connection (ADF Gate line) between the
  - ADF main board and the BICU.