• Code: 231
• Description: FGATE OFF error
  The FGATE signal does not assert within the prescribed time. (The BICU generates the FGATE signal and sends it to the LD unit when the registration sensor switches on.)
• Causes: • BICU defective • BICU, Controller board harness loose or broken • Controller board defective.

• Code: 240
• Description: LD error
  The IPU detected a problem at the LD unit.
• Causes: • Worn-out LD • Disconnected or broken harness of the LD.

• Code: 270
• Description: X The I2C bus device ID is not identified during initialization.
  X A device-status error occurs during I2C bus communication.
  X The I2C bus communication is not established due to an error other than a buffer shortage
• Causes: Loose connection
  Defective IPU
  Defective LD controller board

• Code: 302
• Description: Charge roller bias leak
  A charge roller bias leak signal was detected.
• Causes: • Charge roller damaged • High voltage supply board defective • PCDU harness defective or disconnected

• Code: 304
• Description: Charge roller bias correction leak
  The charge roller bias correction is performed twice even if the maximum charge roller bias (-2000V) is applied to the roller.
• Causes: • ID sensor defective • Worn charge roller • Charge roller damaged

• Code: 320
• Description: Development roller bias leak
  The maximum PMW duty (65%) is detected for 60 ms after the high voltage has been supplied to the development unit.
• Causes: • Development bias leak • Broken harness • Defective high voltage power supply, voltage supply • Defective high voltage supply unit

• Code: 324
• Description: Development paddle motor error
  The machine detects a lock signal error from the development puddle motor for 2 seconds after the drum motor has turned on.
• Causes: • Overload on the development puddle motor • Defective development puddle motor • Defective harness • Defective IOB

• Code: 350
• Description: ID sensor pattern test error
  One of the following readings occurred 10 times in the ID sensor output when the ID sensor pattern was checked:
  1) Vsp < 2.5V
  2) Vsg > 2.5V
  3) Vsp = 0V
  4) Vsg = 0V
• Causes: • ID sensor connector defective • Poor ID sensor connector connection • I/O board (IOB) defective • Poor writing of ID sensor pattern on the drum • High voltage supply board defective