• Code: 490
• Description: Exhaust fan motor lock An exhaust fan motor lock signal is 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 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 Paper height sensor does not activate after the tray lift motor is on for 10 s. If the main power switch is turned on when the paper is already at feed height, the paper height position is detected again, and the paper height sensor should deactivate within 5 s after the paper bottom plate starts to drop. If it does not deactivate within 5 s after 4 consecutive attempts, a message prompts the user to reset Tray 1. After two attempts to release the error by re-setting the paper tray, then this SC is issued.
• 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 Paper height sensor does not activate after the tray lift motor is on for 10 s. If the main power switch is turned on when the paper is already at feed height, the paper height position is detected again, and the paper height sensor should deactivate within 5 s after the paper bottom plate starts to drop. If it does not deactivate within 5 s after 4 consecutive attempts, a message prompts the user to reset Tray 1. After two attempts to release the error by re-setting the paper tray, then this SC is issued.
• 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) Paper height sensor does not activate after the tray lift motor is on for 13 s. If the main power switch is on when the paper is already at the feed height, the paper height position is detected again, and the paper height sensor should de-activate within 5 s after the paper bottom plate starts to drop. If it does not deactivate within 5 s after four consecutive attempts, the tray lift motor halts. After two attempts to reset the paper tray, this SC is issued 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) Paper height sensor does not activate after the tray lift motor is on for 13 s. If the main power switch is on when the paper is already at the feed height, the paper height position is detected again, and the paper height sensor should de-activate within 5 s after the paper bottom plate starts to drop. If it does not deactivate within 5 s after four consecutive attempts, the tray lift motor halts. After two attempts to reset the paper tray, this SC is issued 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 (optional LCT) 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