• Code: C0450
• Description: Mailbox communication problem
  • Communication errors from the communication microcomputer on the main PCB. No communication: there is no reply after 5 retries. Abnormal communication: a communication error (parity or checksum error) is detected five times in succession.
• Causes: Poor contact in the connector terminals. Defective main PCB. Defective mailbox main PCB.
• Remedy: Check the connection of connectors CN3 on the main PCB and CN1 on the mailbox main PCB, and the continuity across the connector terminals. Repair or replace if necessary. Replace the main PCB and check for correct operation. Replace the mailbox main PCB and check for correct operation.

• Code: C0470
• Description: Switchback unit communication problem
  • Communication errors from the communication microcomputer on the main PCB. No communication: there is no reply after 5 retries. Abnormal communication: a communication error (parity or checksum error) is detected five times in succession.
• Causes: Poor contact in the connector terminals. Defective main PCB. Defective switchback unit main PCB.
• Remedy: Check the connection of connectors CN3 on the main PCB and the continuity across the connector terminals. Repair or replace if necessary. Replace the main PCB and check for correct operation. Replace the switchback unit main PCB and check for correct operation.

• Code: C0600
• Description: DIMM problem The DIMM on the memory PCB does not operate correctly.
• Causes: DIMM installed incorrectly. Defective DIMM.
• Remedy: Check if the DIMM is inserted into the socket on the main PCB correctly. Replace the DIMM and check for correct operation.

• Code: C0610
• Description: Bitmap problem • There is a problem with the data or address bus of the bitmap DRAM.
• Causes: Defective main PCB.
• Remedy: Replace the main PCB and check for correct operation.

• Code: C0620
• Description: Memory input interface problem Reading-in of an image does not complete within 10 s of the start of image transmission.
• Causes: Defective main PCB.
• Remedy: Replace the main PCB and check for correct operation.

• Code: C0630
• Description: DMA problem • DMA transmission of compressed, decompressed, rotated, relocated or blanked-out image data does not complete within the specified period of time.
• Causes: Defective main PCB.
• Remedy: Replace the main PCB and check for correct operation.

• Code: C1010
• Description: Upper lift motor problem
  • When the upper drawer is inserted, the upper lift limit switch does not turn on within 6 s of the upper lift motor turning on and the upper lift limit switch does not turn on by turning off the upper lift motor for 200 ms and retrying twice.
  • During copying, the upper lift limit switch does not turn on within 200 ms of the upper lift motor turning on.
• Causes: Broken gears or couplings of the upper lift motor. Defective upper lift motor. Poor contact of the upper lift motor connector terminals. Defective upper lift limit switch. Poor contact of the upper lift limit switch connector terminals.
• Remedy: Replace the upper lift motor. Check for continuity across the coil. If none, replace the upper lift motor. Reinsert the connector. Also check for continuity within the connector cable. If none, repair or replace the cable. Check if CN13-B9 on the main PCB goes low when the upper lift limit switch is turned off. If not, replace the upper lift limit switch. Reinsert the connector. Also check for continuity within the connector cable. If none, repair or replace the cable.

• Code: C1020
• Description: Lower lift motor problem
  • When the lower drawer is inserted, the lower lift limit switch does not turn on within 6 s of the lower lift motor turning on and the lower lift limit switch does not turn on by turning off the lower lift motor for 200 ms and retrying twice.
  • During copying, the lower lift limit switch does not turn on within 200 ms of the lower lift motor turning on.
• Causes: Broken gears or couplings of the lower lift motor. Defective lower lift motor. Poor contact of the lower lift motor connector terminals. Defective lower lift limit switch. Poor contact of the lower lift limit switch connector terminals.
• Remedy: Replace the lower lift motor. Check for continuity across the coil. If none, replace the lower lift motor. Reinsert the connector. Also check for continuity within the connector cable. If none, repair or replace the cable. Check if CN13-B15 on the main PCB goes low when the lower lift limit switch is turned off. If not, replace the lower lift limit switch. Reinsert the connector. Also check for continuity within the connector cable. If none, repair or replace the cable.