• Code: 498
• Description: Temperature and humidity sensor error The output of the temperature sensor was not within the prescribed range (0.5V to 4.2V) for 3 minutes.
• Causes: • Temperature and humidity sensor harness disconnected, loose, defective • Temperature and humidity sensor defective
• Remedy: 1. Check the connector and harness. Replace the temperature/humidity sensors below the black PCDU and yellow PCDU.

• Code: 501
• Description: Tray 1 (tandem tray) feed error • The tray 1 lift sensor does not switch on 10 s after the tray lift motor switches on and starts lifting the bottom plate. • When the tray lowers, the tray lift sensor does not go off within 1.5 sec.
• Causes: • Tray lift motor 1 defective or disconnected • Paper or other obstacle trapped between tray and motor • Pick-up solenoid 1 disconnected or blocked by an obstacle
• Remedy: 1. Check the harness connection. 2. Check or clear obstacles between tray and motor.

• Code: 502
• Description: Tray 2 (universal tray) feed error • The lift sensor is not activated within 10 seconds after the tray lift motor starts lifting the bottom plate. • When the tray lowers, the tray lift sensor does not go off within 1.5 sec.
• Causes: • Tray lift motor 2 defective or disconnected • Paper or other obstacle trapped between tray and motor • Pick-up solenoid 2 disconnected or blocked by an obstacle
• Remedy: 1. Check the harness connection. 2. Check or clear obstacles between tray and motor. 3. Check or clear obstacles around the pick-up solenoid.

• Code: 503
• Description: Tray 3 (A4 LCT) feed error (G178/M078 only) One of the following conditions is detected in tray 3, 4 or 5 of the A4 LCT: The tray 3, 4 or 5 lift sensor is not activated for 10 s after the tray 3, 4 or 5 lift motor turned on. Upper limit is not detected within 10 s while the paper tray is lifting during paper feed. The tray 3, 4 or 5 lift sensor is already activated when tray 3, 4 or 5 is placed in the machine
• Causes: • Poor connection or defective tray 3, 4 or 5 lift motor • Poor connection or defective tray 3, 4 or 5 lift sensor • Remaining paper or another obstruction has stopped the tray and motor. • Pick-up solenoid 3, 4 or 5 connector is loose. • Pick-up solenoid 3, 4 or 5 is blocked by an obstruction.
• Remedy: 1. Replace the tray 3, 4 or 5 lift motor. 2. Replace the tray 3, 4 or 5 lift sensor. 3. Check or clear obstacles around pick-up solenoid 3, 4, or 5.

• Code: 504
• Description: Tray 4 (A4 LCT) feed error (G178/M078 only) One of the following conditions is detected in tray 3, 4 or 5 of the A4 LCT: The tray 3, 4 or 5 lift sensor is not activated for 10 s after the tray 3, 4 or 5 lift motor turned on. Upper limit is not detected within 10 s while the paper tray is lifting during paper feed. The tray 3, 4 or 5 lift sensor is already activated when tray 3, 4 or 5 is placed in the machine
• Causes: • Poor connection or defective tray 3, 4 or 5 lift motor • Poor connection or defective tray 3, 4 or 5 lift sensor • Remaining paper or another obstruction has stopped the tray and motor. • Pick-up solenoid 3, 4 or 5 connector is loose. • Pick-up solenoid 3, 4 or 5 is blocked by an obstruction.
• Remedy: 1. Replace the tray 3, 4 or 5 lift motor. 2. Replace the tray 3, 4 or 5 lift sensor. 3. Check or clear obstacles around pick-up solenoid 3, 4, or 5.

• Code: 505
• Description: Tray 5 (A4 LCT) feed error (G178/M078 only) One of the following conditions is detected in tray 3, 4 or 5 of the A4 LCT: The tray 3, 4 or 5 lift sensor is not activated for 10 s after the tray 3, 4 or 5 lift motor turned on. Upper limit is not detected within 10 s while the paper tray is lifting during paper feed. The tray 3, 4 or 5 lift sensor is already activated when tray 3, 4 or 5 is placed in the machine
• Causes: • Poor connection or defective tray 3, 4 or 5 lift motor • Poor connection or defective tray 3, 4 or 5 lift sensor • Remaining paper or another obstruction has stopped the tray and motor. • Pick-up solenoid 3, 4 or 5 connector is loose. • Pick-up solenoid 3, 4 or 5 is blocked by an obstruction.
• Remedy: 1. Replace the tray 3, 4 or 5 lift motor. 2. Replace the tray 3, 4 or 5 lift sensor. 3. Check or clear obstacles around pick-up solenoid 3, 4, or 5.

• Code: 506
• Description: Tray 3 (1st A3 LCT) feed error. One of the following conditions is detected in tray 3 or 4 of the 1st A3 LCT: The tray 3 or 4 lift sensor is not activated for 10 s after the tray 3 or 4 lift motor turned on. Upper limit is not detected within 10 s while the paper tray is lifting during paper feed. The tray 3 or 4 lift sensor is already activated when tray 3 or 4 is placed in the machine
• Causes: • Poor connection or defective tray 3 or 4 lift motor • Poor connection or defective tray 3 or 4 lift sensor • Remaining paper or another obstruction has stopped the tray and motor. • Pick-up solenoid 3 or 4 connector is loose. • Pick-up solenoid 3 or 4 is blocked by an obstruction.
• Remedy: 1. Replace the tray 3 or 4 lift motor. 2. Replace the tray 3 or 4 lift sensor. 3. Check or clear obstacles around pick-up solenoid 3 or 4.

• Code: 507
• Description: Tray 4 (1st A3 LCT) feed error. One of the following conditions is detected in tray 3 or 4 of the 1st A3 LCT: The tray 3 or 4 lift sensor is not activated for 10 s after the tray 3 or 4 lift motor turned on. Upper limit is not detected within 10 s while the paper tray is lifting during paper feed. The tray 3 or 4 lift sensor is already activated when tray 3 or 4 is placed in the machine
• Causes: • Poor connection or defective tray 3 or 4 lift motor • Poor connection or defective tray 3 or 4 lift sensor • Remaining paper or another obstruction has stopped the tray and motor. • Pick-up solenoid 3 or 4 connector is loose. • Pick-up solenoid 3 or 4 is blocked by an obstruction.
• Remedy: 1. Replace the tray 3 or 4 lift motor. 2. Replace the tray 3 or 4 lift sensor. 3. Check or clear obstacles around pick-up solenoid 3 or 4.