• Code: 391
• Description: TD sensor error: Auto adjust error At initialization of the TD sensor, VT < 1.8 V or VT > 4.8 V.
• Causes: • TD sensor abnormal • TD sensor disconnected • Poor TD sensor connection • I/O board (IOB) defective • Toner supply defective

• Code: 395
• Description: Development bias abnormal A development bias leak signal is detected. High voltage output to the development unit exceeded the upper limit (65%) for 60 ms.
• Causes: • High voltage supply board defective • Poor connection at the development bias terminal • Poor connection at the high voltage supply board

• Code: 401
• Description: Transfer roller bias output abnormal A transfer roller current leak signal is detected.
• Causes: • High voltage supply board defective • Poor cable connection or defective cable • Transfer connector defective

• Code: 402
• Description: Transfer roller open error The transfer roller current feedback signal is not detected.
• Causes: • High voltage supply board defective • Transfer connector cable defective • Transfer connector defective • Poor PCU connection

• Code: 403
• Description: Transfer belt H.P. abnormal H.P. is not detected after the T/S clutch is switched on twice.
• Causes: • Main motor/drive malfunction • Transfer belt contact clutch defective • Transfer belt position sensor defective • Harness disconnected

• Code: 405
• Description: Transfer belt position abnormal The transfer belt does not separate from the drum during ID sensor pattern checking.
• Causes: • Main motor/drive malfunction • Transfer belt position sensor defective • Poor transfer belt position sensor connection • Transfer belt contact clutch defective

• Code: 440
• Description: Main motor abnormal (1) During motor rotation before the start of printing, the H.P. of the T/S clutch is detected, the main motor lock signal (PLL) goes low, and 5 retries are not successful, resulting in an internal lock. (2) A main motor lock signal is not detected within 2 seconds after the main motor turns on.
• Causes: • Too much load on the drive mechanism • Main motor defective

• Code: 450
• Description: Feed/Development motor abnormal (1) During motor rotation before the start of printing, the motor lock signal (PLL Lock) goes low, 5 retries are not successful, resulting in an internal lock. (2) A motor lock signal is not detected within 2 s after the main motor turns on.
• Causes: • Feed/development motor defective