• Code: 503-00
• Description: 3rd paper tray lift motor malfunction (optional paper feed unit) When the tray is lifted up, the tray lift motor error, or sensor error is detected.
• Causes: • Tray Lift Motor disconnection or loose harness • Tray Bottom Plate Pressure Sensor disconnection or loose harness • Tray Bottom Plate HP Sensor disconnection or loose harness • Other defective mechanical parts
• Remedy: Do the following steps. Cycle the power off/on after doing each step to check if the SC occurs. 1. Reconnect the connector of the Tray Bottom Plate HP Sensor. 2. Reconnect the connector of the Tray Bottom Plate Pressure Sensor. 3. Replace the Lift Lever Encoder, gear encoder for tray lift unit (‘rising unit’ in the parts catalog), and the tension spring for paper feed. 4. Replace the tray lift motor. 5. Replace the harness. 6. Replace the board in the tray.

• Code: 508-00
• Description: Bypass bottom plate error The signal from the bypass tray HP sensor does not change for 2 seconds after the bypass bottom plate clutch was activated. If this condition occurs three consecutive times, this SC is generated.
• Causes: • Disconnected or defective connectors of the bypass bottom plate clutch • Disconnected or defective bypass HP sensor • Defective bypass bottom plate detection filler
• Remedy: 1. Check or replace the connectors of the bypass bottom plate clutch. 2. Check or replace the bypass HP sensor.

• Code: 524-00
• Description: Transport motor error The machine detects a LOCK signal from Transport motor for 2 seconds when the motor is activated.
• Causes: • Paper exit unit overload • Defective transport motor
• Remedy: • Replace the paper exit unit. • Replace the transport motor.

• Code: 525-00
• Description: Transport motor error: bank 1 The machine detects a Lock signal from a bank 1 transport motor after the motor turned on.
• Causes: • Motor overload • Defective motor • Disconnected connectors • Damaged harness
• Remedy: Do the following steps. Check if the SC reoccurs by cycling the power after each step. 1. Reconnect the connector. 2. Replace the harness. 3. Replace the transport motor.

• Code: 526-00
• Description: Transport motor error: bank 2 The machine detects a Lock signal from a bank 2 transport motor after the motor turned on.
• Causes: • Motor overload • Defective motor • Disconnected connectors • Damaged harness
• Remedy: Do the following steps. Check if the SC reoccurs by cycling the power after each step. 1. Reconnect the connector. 2. Replace the harness. 3. Replace the transport motor.

• Code: 530-00
• Description: Fusing heater exhaust fan motor error. The motor lock signal error is detected 50 consecutive times (5 seconds) after the motor lock signal was first detected.
• Causes: • Defective fan motor • Disconnected or defective harness • Defective BiCU
• Remedy: 1. Check or replace the harness. 2. Replace the fan motor. 3. Replace the BiCU.

• Code: 531-00
• Description: Development cooling fan motor error. The motor lock signal error is detected 50 consecutive times (5 seconds) after the motor lock signal was first detected.
• Causes: • Defective fan motor • Disconnected or defective harness • Defective BiCU
• Remedy: 1. Check or replace the harness. 2. Replace the fan motor. 3. Replace the BiCU.

• Code: 532-00
• Description: Writing cooling fan motor error. The motor lock signal error is detected 50 consecutive times (5 seconds) after the motor lock signal was first detected.
• Causes: • Defective fan motor • Disconnected or defective harness • Defective BiCU
• Remedy: 1. Check or replace the harness. 2. Replace the fan motor. 3. Replace the BiCU.