• 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. 1 Volt (or more) returns for 300 milliseconds.
• Causes: • Short circuit in the charge corona unit • Defective high voltage supply board • Defective harness (BICU - high voltage supply board)

• Code: 302
• Description: Charge grid electrical leak
  The returning voltage N from the OPC unit is detected for 60 ms. N >= 1/2 output value
• Causes: • Defective PCU installation (OPC belt) • Short circuit in the charge grid • Defective high voltage supply board • Defective harness (BICU - high voltage supply board)

• Code: 305
• Description: Charge corona unit cleaner error
  • Cleaning starts. The lock signal is not detected within 30 seconds. • Cleaning starts. The cleaner starts to turn. The lock signal is detected within 6 seconds. • The lock signal is detected while the unit is moving away from the home position. The next lock signal is detected within 6 seconds after the unit has turned toward the home position.
• Causes: • Defective PCU installation (OPC belt) • Defective cleaner • Incorrect charge corona unit installation • Toner fallen into the cleaner drive mechanism

• Code: 350
• Description: Development short circuit error
  A development process starts. The returning voltage stays at 1V or less within 0.48 seconds.
• Causes: • Short circuit in the development unit • Defective high voltage supply board • Defective harness (BICU - high voltage supply board)

• Code: 352
• Description: Development motor 1 error
  • Development motor 1 changes its speed from half to normal. 1) Motor 1 does not detect a 0.3second lock signal within 0.9 seconds. 2) Motor 1 does not detect the lock signal for 0.3 seconds after it detected a 0.3-second lock signal before. • The development motor starts 3) Motor 1 does not detect a 1second lock signal within 3 seconds. 4) Motor 1 does not detect the lock signal for 0.3 seconds after it detected a 1-second lock signal before.
• Causes: • Defective development motor (Y & M) • Too much load on the development unit (Y & M) • Defective harness connection

• Code: 353
• Description: Development motor 2 error
  • Development motor 2 changes its speed from half to normal. 3) Motor 2 does not detect a 0.3second lock signal within 0.9 seconds. 4) Motor 2 does not detect the lock signal for 0.3 seconds after it detected a 0.3-second lock signal before. • The development motor starts 5) Motor 2 does not detect a 1second lock signal within 3 seconds. 6) Motor 2 does not detect the lock signal for 0.3 seconds after it detected a 1-second lock signal before.
• Causes: • Defective development motor (K & C) • Too much load on the development unit (K & C) • Defective harness connection

• Code: 401
• Description: 1st transfer (image transfer) circuit open
  The returning voltage N from the image transfer unit is detected for 60 ms. N >= 1/2 output value
• Causes: • Open circuit in the image transfer belt • Defective high voltage supply board • Defective harness (BICU - high voltage supply board)

• Code: 410
• Description: 2nd transfer (paper transfer) electric leakage (+)
  Paper transfer starts. The positive (+) output is at the minimum PWM duty value. The returning voltage does not reach 4.29 V or less for 60 milliseconds.
• Causes: • Short circuit in the paper transfer unit • Defective high voltage supply board • Defective harness (BICU - high voltage supply board)