• Code: C16
• Description: 4th cassette tray operation abnormal
• Remedy: Is the cassette pushed in properly to the copier? N: Push in the cassette properly to the copier. Y: Is the harness between the LGC board and the cassette tray-up limit sensor open-circuited? Is the harness between the LGC board and the cassette tray-up motor open-circuited? Is the cassette tray-up limit sensor connector, cassette tray-up motor connector, or connector J106 on the LGC board disconnected? Y: 1. Reconnect the connector. 2. Replace the harness. N: Is the gear of the cassette tray-up motor unit broken? Y: Replace the gear. N: 1. Replace the cassette tray-up motor. 2. Replace the cassette tray-up limit sensor. 3. Replace the paper feed unit. 4. Replace the LGC board.

• Code: C18
• Description: LCF tray operation abnormal
• Remedy: Is the harness between the LGC board and the LCF unit open-circuited? Is the relay connector of the harness between the LGC board and the LCF unit or the connector J105 on the LGC board disconnected? Y: Reconnect the connector. Replace the harness. N: Are the switches and sensors in the LCF unit working properly? Y: 1. Replace the LCF tray motor. 2. Replace the LGC board. N: 1. Replace the sensors and switches. 2. Replace the LCF drive PC board or the LCF tray-down switch PC board. 3. Replace the LGC board.

• Code: C27
• Description: Carriage home position sensor not turning OFF within a fixed time
• Remedy: Are the carriages stuck at a point other than the home position? Y: Check the SCM and SDV boards for any abnormal circuit. N: 1. Check if any connector pin is disconnected, or any harness is open- or short-circuited. 2. Check the scan motor drive pulley if its screws are loose. 3. Check if any conductor pattern on the SDV board is open- or short-circuited. 4. Check if any conductor pattern on the SCM board is open- or short-circuited. 5. Replace the SDV board. 6. Replace the SCM board.

• Code: C28
• Description: Carriage home position sensor not turning ON within a fixed time
• Remedy: Do the carriages, after arriving at its home position, make a big noise? Y: Since the carriage home position sensor has not been turned ON, 1. Check if the sensor connector is disconnected. 2. Check the SDV and SCM boards for any abnormal circuit. N: Since the carriages do not move, 1. Check if any connector pin is disconnected, or any harness is open- or short-circuited. 2. Check if any conductor pattern on the SDV board is open- or short-circuited. 3. Check if any conductor pattern on the SCM board is open- or short-circuited. 4. Replace the SDV board. 5. Replace the SCM board

• Code: C29
• Description: Exposure lamp disconnection detected
• Remedy: Does the exposure lamp light? Y: 1. Check the CCD and SCM boards for any disconnected connector. 2. Check the shading correction plate of the original-width indicator unit if it is dusty. 3. Check the CCD board for any open- or short-circuited conductor pattern. 4. Check the SCM board for any open- or short-circuited conductor pattern. 5. Replace the SCM board. 6. Replace the lens unit. N: 1. Check if the lamp connector is disconnected. 2. Check the SCM board if any pin of connectors J7-1, -2 and -3 is disconnected or any harness is open- or short-circuited. 3. Check the SCM board for any open- or short-circuited conductor pattern. 4. Replace the SCM board. 5. Replace the inverter. 6. Replace the exposure lamp.

• Code: C31
• Description: Used toner transport motor rotation abnormal
• Remedy: Is the harness between the LGC board and the used toner transport motor open-circuited? Is the connector J123 or J102 on the LGC board, the relay connector or the used toner transport motor connector disconnected? Y: Replace the harness. Reconnect the connector. N: Is used toner jammed? Is any abnormal mechanical load found? Y: 1. Remove the jammed used toner. 2. Check for any foreign matter in the drive system. 3. Check the bearing of the used toner transport auger for any abnormality. 4. Check if the toner bag is covered with used toner. N: 1. Replace the used toner transport motor. 2. Replace the LGC board.

• Code: C33
• Description: Developer removal shutter abnormal
• Remedy: Reduce the mechanical load by adjusting the drive system. Remove any foreign matter. Is the connector J115 on the LGC board disconnected? Y: Reconnect the connector. N: Replace the LGC board.

• Code: C35
• Description: Transfer belt unit contact/release operation abnormal
• Remedy: Reduce the mechanical load by adjusting the drive system. Remove any foreign matter. Is the harness between the LGC board and the transfer/transport unit drawer connector, or the harness inside the transfer/transport unit open-circuited? Is the transfer belt contact/release drive motor connector, LGC board connector J115 or J102, transfer belt home position switch connector, or transfer belt limit switch connector disconnected? Is the transfer belt home position switch or the transfer belt limit switch defectively installed? Y: 1. Replace the harness. Reconnect the connector. 2. Reinstall the transfer belt home position switch or the transfer belt limit switch securely. N: 1. Replace the transfer belt home position switch and the transfer belt limit switch. 2. Replace the transfer belt contact/release drive motor. 3. Replace the LGC board.