• Code: 546
• Description: Unstable fusing temperature (center)
  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: 547
• Description: Zero cross signal malfunction
  Zero cross signals are not detected within 5 seconds after the main power switch is turned on, or are not detected within 1 second after operation begins.
• Causes: • Power supply board defective
  • BICU 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: 591
• Description: Rear 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: 620
• Description: Communication error between BICU and ADF
  The BICU does not receive a response from the ADF main board for 4 seconds or more. The BICU receives a break signal from the ADF main board.
• Causes: • Poor connection between the BICU and
  ADF main board (DF connector)
  • ADF main board defective
  • BICU defective

• 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/B259/ B260/B261 is installed on a B282/B283)
  • The connector of the ADF is removed while the machine is in the energy saver mode

• Code: 692
• Description: Controller board communication abnormal
  Communication error between the printer part of the controller board and BICU.
• Causes: • The connector is abnormal between the controller board and the BICU board.