• Code: 300
• Description: Charge corona output error
  The feedback voltage from the charge corona unit is detected too high 9 times.
• Causes: • Charge corona power pack defective • Charge corona harness disconnected • Poor charge corona unit connection

• Code: 303
• Description: When the high voltage is output to the corona grid, feedback voltage exceeds the prescribed value 9 times.
• Causes: • Charge corona power pack defective • Charge corona harness disconnected • Poor charge corona unit connection

• Code: 304
• Description: Charge grid circuit open
  When high voltage goes to the corona grid, feedback voltage is more than the set value 9 times. This feedback voltage is used to update PWM for output control.
• Causes: • Charge corona unit defective or disconnected • Charge corona harness defective • Charge corona power pack is defective.

• Code: 305
• Description: Charge corona wire cleaner error 1
  The charge cleaner pad does not arrive at the home position: Motor locked within 4 s after switching on, or does not lock within 30 s. Motor locked within 10 s after reversing, or does not lock within 30 s.
• Causes: • Charge corona wire cleaner motor defective • Motor driver defective

• Code: 306
• Description: Charge corona wire cleaner error 2
  Charge coronal motor is disconnected. (The current at the charge corona motor is detected less than 83 mA.)
• Causes: • Charge corona wire cleaner motor connector is defective, connected

• Code: 310
• Description: Potential sensor calibration error 1
  During drum potential sensor calibration, the drum potential sensor output voltage does not meet specification when test voltages (–100V, –800V) are applied to the drum
• Causes: • IOB defective • OPC connector defective • Development power pack defective

• Code: 311
• Description: Potential sensor calibration error 2
  During drum potential sensor calibration, the drum potential sensor output voltage does not meet specification when test voltages (–100V, –800V) are applied to the drum.
• Causes: • Potential sensor defective • Potential sensor harness disconnected • Potential sensor connector defective or disconnected • IOB defective • OPC connector defective • Development power pack defective

• Code: 312
• Description: Potential sensor calibration error 3
  During drum potential sensor calibration when adjusting the drum potential (VD), the drum potential sensor detects VD higher than VG (grid voltage). -or- When adjusting VD (drum surface potential of black areas after exposure), even after 5 adjustments of VG (charge corona grid potential), VD could not be set in the target range (–800+-10 +- VL + 130V)
• Causes: • Potential sensor defective • Potential sensor harness disconnected • Potential sensor connector defective or disconnected • IOB defective • OPC connector defective • Development power pack defective • Charge corona unit worn out, dirty