• Code: 220
• Description: 1st beam synchronization error
  A polygon motor lock is detected; the LD door is closed; and the LD remains on. → The LD error (1st beam synchronization error) continues for 0.5 seconds.
• Causes: • Disconnected synchronization detector board • Defective LD unit • Defective BICU

• Code: 221
• Description: 2nd beam synchronization error
  A polygon motor lock is detected; the LD door is closed; and the LD remains on. → The LD error (2nd beam synchronization error) continues for 0.5 seconds.
• Causes: • Disconnected synchronization detector board • Defective LD unit • Defective BICU

• Code: 230
• Description: FGATE on error
  A transfer belt mark is detected. → No FGATE on signal is detected within 1 second.
• Causes: • Defective BICU

• Code: 231
• Description: FGATE off error
  An FGATE assert signal is detected. → The FGATE negate signal is not detected within 30 seconds.
• Causes: • Defective BICU

• Code: 241
• Description: LD error
  An LD error continues for 0.5 seconds. (After an LD error is detected, an LD error release is written to the GAVD chip during monitoring.)
• Causes: • Defective LD unit

• Code: 280
• Description: Image transfer belt mark detection error
  • An imaging process starts. → No belt mark is detected within 1 revolution. • A color imaging process starts. → A mono color image is transferred. → FGATE becomes active. → No belt mark is detected within 1 revolution. • Thick paper or OHP film is used. → The belt slows down. → No belt mark is detected within 1 revolution.
• Causes: • Defective BICU • Poor electrical connection between sensor and BICU

• Code: 282
• Description: GAVD communication error
  Data is transferred. → The CPU does not detect the communication signal from GAVD.
• Causes: • Defective BICU

• Code: 300
• Description: Charge corona unit electrical leak
  The supply to the charge corona unit is continuously output, and the unit is operating at the minimum PWM duty value. → 4.5 Volts (or more) returns for 60 milliseconds.
• Causes: • Short circuit in the charge corona unit • Defective high voltage supply board • Defective harness (BICU -high voltage supply board)