• Code: A0-22
• Description: Conflict firmware and EEPROM data version (SCU)
• Causes: Inconsistency between the SCU firmware version and the EEPROM data version.
• Remedy: Check the combination of the firmware.

• Code: C1-10
• Description: Main charger trouble (Monochrome)
• Causes: The main charger unit (BK) is not installed properly. There is an abnormality in the main charger unit (BK). The developer unit (KCMY) is not installed properly. There is an abnormality in the developer unit (KCMY). Disconnection of the high voltage MC PWB connector. Breakage of the high voltage harness. High voltage MC PWB trouble. PCU PWB trouble.
• Remedy: Check the output of the main charger with SIM8-2. Check the output of the developing bias with SIM8-1. Check disconnection of the main charger./Replace. Check disconnection of the developer unit./Replace. Check disconnection of the high voltage MC PWB connector./Replace. Replace the high voltage MC PWB. Replace the PCU PWB.

• Code: C1-14
• Description: Main charger trouble (Color)
• Causes: The main charger unit (CMY) is not installed properly. There is an abnormality in the main charger unit (CMY). Disconnection of the high voltage MC PWB connector. Breakage of the high voltage harness. High voltage MC PWB trouble. PCU PWB trouble.
• Remedy: Check the output of the main charger with SIM8-2. Check disconnection of the main charger./Replace. Check disconnection of the high voltage MC PWB connector./Replace. Replace the high voltage MC PWB Replace the PCU PWB.

• Code: C4-00
• Description: PTC trouble (TC high pressure trouble)
• Causes: PTC unit is not properly installed. Primary/Secondary transfer PWB trouble.. Primary/Secondary transfer unit is not installed properly. High pressure TC PWB trouble. PCU PWB trouble. Connector, harness connection trouble.
• Remedy: Replace the PTC unit. Replace the secondary transfer PWB. Replace the secondary transfer unit. Replace the PCU PWB. Check connection of the connector and the harness. NOTE: When the PTC unit is broken down and repair cannot be made because of no replacement part: To use the machine continuously, make the setting to ignore the PTC trouble, and the machine can be operated tentatively. Set the engine soft SW8-3 in SIM55-1 to "1". This setting disables the PTC output, the heater control, and the error detection. After completion of repair, set the engine soft SW8-3 in SIM55-1 to "0".

• Code: C4-02
• Description: PTC heater open trouble
• Causes: The PTC unit is not installed, or the eater line conduction trouble. PCU PWB trouble. Connector, harness connection trouble.
• Remedy: Replace the PTC unit. Replace the PCU PWB. Check connection of the connector and the harness. NOTE: When the PTC unit is broken down and repair cannot be made because of no replacement part: To use the machine continuously, make the setting to ignore the PTC trouble, and the machine can be operated tentatively. Set the engine soft SW8-3 in SIM55-1 to "1". This setting disables the PTC output, the heater control, and the error detection. After completion of repair, set the engine soft SW8-3 in SIM55-1 to "0".

• Code: C4-03
• Description: PTC heater short trouble
• Causes: PTC unit trouble. PCU PWB trouble. Connector, harness connection trouble.
• Remedy: Replace the PTC unit. Replace the PCU PWB. Check connection of the connector and the harness. NOTE: When the PTC unit is broken down and repair cannot be made because of no replacement part: To use the machine continuously, make the setting to ignore the PTC trouble, and the machine can be operated tentatively. Set the engine soft SW8-3 in SIM55-1 to "1". This setting disables the PTC output, the heater control, and the error detection. After completion of repair, set the engine soft SW8-3 in SIM55-1 to "0".

• Code: C4-10
• Description: PTC no control
• Causes: The engine soft SW8-3 in SIM55-1 is set to "1". The PTC control is not executed. (The PTC does not operate.) When the engine soft SW8-3 in SIM55-1 is set to "1", the PTC output, the heater control, and the error detection are disabled. When this setting is made in case of a PTC unit trouble, the PTC function is disabled regardless of the PTC trouble and printing operation can be performed.
• Remedy: Set the engine soft SW8-3 in SIM55-1 to "0". (The mode returns to the normal PTC control mode.)

• Code: C4-20
• Description: Primary transfer output trouble
• Causes: The primary transfer unit is not installed properly./ Trouble. High voltage 1TC PWB trouble. High voltage MC PWB trouble. PCU PWB trouble. Connector, harness connection trouble.
• Remedy: Replace the primary transfer unit. Check disconnection of the high voltage 1TC PWB connector./Replace. Check disconnection of the high voltage MC PWB connector./Replace. Replace the PCU PWB.