Code :

Code: SC 623
Description: Duplex unit communication error While the BCU communicates with an optional unit, an SC code is displayed if one of following conditions occurs. 1. The BCU receives a signal which is generated by the peripherals only just after the main switch is turned on. 2. When the BCU does not receive an OK signal from a peripheral 100ms after sending a command to it. The BCU resends the command. The BCU does not receive an OK signal after sending the command 3 times.
Causes: • Cable problems • BCU problems • PSU problems in the machine • Duplex control board problem
Remedy: 1. Turn the main switch off and on. 2. Check if the cable of the duplex inverter unit is properly connected. 3. Replace the PSU if no power is supplied to the peripherals. 4. Replace the duplex control board in the inverter unit.

Code: SC 640
Description: BCU - Controller communication error (check sum error) The check sum of the interface between the BCU and controller is not the same.
Causes: • Defective controller • Defective PCU
Remedy: 1. Turn the main switch off and on. 2. Replace the controller. 3. Replace the BCU.

Code: SC 641
Description: BCU . Controller communication error (no response) The controller does not receive any response from the BCU three consecutive times when sending a signal every 100ms.
Causes: • Loose connection • Defective controller • Defective BCU
Remedy: 1. Turn the main switch off and on. 2. Check the connection between the BCU and controller. 3. Replace the controller. 4. Replace the BCU.

Code: SC 642
Description: Communication timeout error between controller and operation panel • The operation panel does not respond to the frame sent from the controller.
Causes: • Controller defective • Operation panel defective • External noise • Harness between controller and operation panel disconnected
Remedy: 1. Turn the main switch off an on. 2. Check the cable connection between the controller and the operation panel. 3. Shut out the external noise. 4. Replace the controller. 5. Replace the operation panel.

Code: SC 670
Description: No response from BCU at power on When the main power is turned on or the machine starts warming up from energy-saving mode, the controller does not receive a command signal from the BCU.
Causes: • Loose connection • Defective controller • Defective BCU
Remedy: 1. Turn the main switch off and on. 2. Check the connection between the BCU and controller. 3. Replace the controller. 4. Replace the BCU.

Code: SC 672
Description: Controller-tooperation panel communication error at startup • After the machine is powered on, the communication between the controller and the operation panel is not established, or communication with controller is interrupted after a normal startup. • After startup reset of the operation panel, the attention code or the attention acknowledge code is not sent from the controller. • After the controller issues a command to check the communication line with the controller at 30-second intervals, the controller fails to respond twice.
Causes: • Controller stalled • Controller board installed incorrectly • Controller board defective • Operation panel connector loose or defective
Remedy: 1. Turn the main switch off and on. 2. Check the condition of the controller board. 3. Check the condition of the operation panel. 4. Replace the controller board. 5. Replace the operation panel.

Code: SC 680
Description: BCU/ MUSIC communication error After the engine CPU sends a message, the Music CPU does not respond within five seconds three consecutive times.
Causes: • Toner cartridge memory chip loose connection • Memory chip problem • Memory chip cable wiring problem
Remedy: 1. Turn the main switch off and on. 2. Check if the toner cartridge is installed correctly. 3. Replace the toner cartridge. 4. Check if the harnesses are not damaged. 5. Replace the BCU.

Code: SC 685
Description: SBU-IPU communication error • During data transfer, a checksum error occurs. • During any operation except initialization, the SBU sends a hardware-reset acknowledgement to the IPU.
Causes: • Scanner unit cable connector loose • SBU board defective • IPU board defective • External noise
Remedy: 1. Turn the main switch off and on. 2. Shut out the external noise. 3. Check the cable connection of the scanner unit. 4. Replace the SBU board. 5. Replace the IPU board.