• Code: 490
• Description: Exhaust fan motor lock
  An exhaust fan motor lock signal is not detected within 5 seconds after the exhaust fan motor turns on.
• Causes: • Too much load on the drive mechanism • Exhaust fan motor defective or a loose object is interfering with the fan • Poor fan motor connector connection

• Code: 492
• Description: Cooling fan motor lock
  A cooling fan motor lock signal is not detected within 5 seconds after the cooling fan motor turns on.
• Causes: • Too much load on the drive mechanism • Cooling fan motor defective or a loose object is interfering with the fan • Poor fan motor connector connection

• Code: 501
• Description: 1st tray lift malfunction
  The paper height sensor is not activated after the tray lift motor has been on for 10 seconds. If the main power switch is turned on when the paper is already at the feed height, the paper height position is detected again. At this time, the paper height sensor should de-activate within 5 seconds after the paper bottom plate starts to drop. If it does not deactivate within 5 s four times consecutively, a message will prompt the user to reset Tray 1. After two attempts to release the error by re-setting the paper tray, if this does not solve the problem then this SC is displayed.
• Causes: • Lift motor malfunction or disconnected • Height sensor abnormal, or connector loose • Loose paper or object between the tray and motor • Pick-up arm malfunction

• Code: 502
• Description: 2nd tray lift malfunction
  The paper height sensor is not activated after the tray lift motor has been on for 10 seconds. If the main power switch is turned on when the paper is already at the feed height, the paper height position is detected again. At this time, the paper height sensor should de-activate within 5 seconds after the paper bottom plate starts to drop. If it does not deactivate within 5 s four times consecutively, a message will prompt the user to reset Tray 2. After two attempts to re-set the paper tray, if this does not solve the problem then this SC is displayed.
• Causes: • Lift motor abnormal or disconnected • Height sensor defective or disconnected • Loose paper or object between the tray and motor • Pick-up arm malfunction

• Code: 503
• Description: 3rd tray lift malfunction (optional paper tray unit)
  The paper height sensor is not activated after the tray lift motor has been on for 13 seconds. If the main power switch is turned on when the paper is already at the feed height, the paper height position is detected again. At this time, the paper height sensor should de-activate within 5 seconds after the paper bottom plate starts to drop. If it does not deactivate within 5 s four times consecutively, the tray lift motor halts. After two attempts to re-set the paper tray, if this does not solve the problem, then this SC is displayed and tray control halts.
• Causes: • Tray lift motor defective or disconnected • Height sensor defective or disconnected

• Code: 504
• Description: 4th tray lift malfunction (optional paper tray unit)
  The paper height sensor is not activated after the tray lift motor has been on for 13 seconds. If the main power switch is turned on when the paper is already at the feed height, the paper height position is detected again. At this time, the paper height sensor should de-activate within 5 seconds after the paper bottom plate starts to drop. If it does not deactivate within 5 s four times consecutively, the tray lift motor halts. After two attempts to re-set the paper tray, if this does not solve the problem, then this SC is displayed and tray control halts.
• Causes: • Tray lift motor defective or disconnected • Height sensor defective or disconnected

• Code: 506
• Description: Paper tray unit main motor lock (optional paper tray)
  A main motor lock signal is detected for more than 50 ms during rotation.
• Causes: • Paper tray unit main motor defective • Paper tray unit main motor connection loose • Too much load on the drive mechanism

• Code: 507
• Description: LCT main motor lock
  A main motor lock signal is detected for more than 50 ms during rotation.
• Causes: • LCT main motor defective • Paper tray unit main motor connection loose • Too much load on the drive mechanism