• Code: CD390
• Description: Nonvolatile data checksum error. C-D390 code is normally shown when the MFP board is replaced with a new one.
• Causes:
• Remedy: 1. Wait until “Recover Data” appears. (MFP will reboot maximum 2 times by itself, it may take 5 minutes.) Touch the “Recover Data” button and follow the instructions that appear on the control panel to restore (backup) data.

• Code: CD391
• Description: Nonvolatile data save error (eMMC)
• Causes:
• Remedy: NOTE • Contact the responsible people of KM before taking some countermeasures.

• Code: CD392
• Description: Nonvolatile data save error (EEPROM). The EEPROM is replaced with a new one.
• Causes: • EEPROM/1 • EEPROM/2
• Remedy: 1. Replace the following components with new ones. When the transfer belt unit and the fusing unit have been replaced with new ones, perform [New Release] in the service mode. When the transfer roller has been replaced with a new one, perform [Counter clear]. • Developing unit/Y,M,C,K • Drum unit/Y,M,C,K • Toner cartridge/Y,M,C,K • Transfer belt unit • Fusing unit • Transfer roller • Feed roller, pick-up roller, separation roller (including options) 2. Turn OFF the main power switch, disconnect and then connect the power cord. Wait for 10 sec. or more after connect the power cord, and turn ON the main power switch. 3. Set the various setting values in the service mode again.

• Code: CD3A0
• Description: Counter error. The total counter values provided by the MFP board and the eMMC board are different.
• Causes: • MFP board (MFPB) • eMMC board (eMMC)
• Remedy: 1. If this error occurs temporarily due to the use of the board removed from another machine, reinstall the original board. 2. Replace the current MFPB with a new one. 3. Replace the current eMMC with a new one.

• Code: CD401 ... CD407
• Description: • CD401: NACK command incorrect • CD402: ACK command incorrect • CD403: Checksum error • CD404: Receiving packet incorrect • CD405: Receiving packet analysis error • CD406: ACK receiving timeout • CD407: Retransmission timeout •
• Causes: MFP board (MFPB)
• Remedy: 1. Check whether there is a strong electromagnetic noise source near the main body. 2. Check the connectors on MFPB for proper connection and correct as necessary. 3. Replace MFPB.

• Code: CD411, CD412, CD413
• Description: • CD407: Retransmission timeout • CD411: Touch panel board error • CD412: Touch panel type mismatch • CD413: Electrostatic touch panel operation mode error. When abnormality is found in the communication of controller.
• Causes: MFP board (MFPB)
• Remedy: 1. Check whether there is a strong electromagnetic noise source near the main body. 2. Check the connectors on MFPB for proper connection and correct as necessary. 3. Replace MFPB

• Code: CD601, CD602, CD603
• Description: Trouble related to security
• Causes:
• Remedy: 1. Turn OFF the main power switch, wait for 10 sec. or more, and turn ON the main power switch. If the above actions do not solve the problem, contact KM.

• Code: CD701, CD702, CD703
• Description: • CD701: Mechanical controller flash ROM writing error • CD702: Mechanical controller flash ROM device error • CD703: FW download communication fault. CD701: A mechanical controller flash ROM writing sequence is interrupted in its mid-operation due to, for example, power being shut off. CD702: An erase error or other device fault occurs during mechanical controller flash ROM writing. CD703: Irregular data is received during FW downloading. • Places are changed in the order of write completion pulses. • A write completion pulse is received for a memory for which binary writing is not permitted. • Final checksum mismatch in FW download • Two-minute timeout (no response from CTL, the number of transfer data items less than the specified)
• Causes: MFP board (MFPB)
• Remedy: 1. Turn OFF the main power switch, disconnect and then connect the power cord. Wait for 10 sec. or more after connect the power cord, and turn ON the main power switch. 2. Rewrite the firmware. 3. Replace MFPB.