Causes: Abnormal detection of FAX control PWB incompatibility in the initial communication with the FAX control PWB, any normal communication command is not transmitted.
Remedy: 1 Checking the FAX PWB The incompatible FAX PWB is installed. Install the FAX PWB for the applicable model. 2 Firmware upgrade The FAX firmware is faulty. Reinstall the FAX firmware. 3 Replacing the main PWB The main PWB is faulty. Replace the main PWB.
Code: C0100
Description: Backup memory device error
Causes: An abnormal status is output from the flash memory.
Remedy: 1 Resetting the main power The flash memory does not operate properly. Turn off the power switch and unplug the power plug. After 5s passes, reconnect the power plug and turn on the power switch. 2 Checking the main PWB The connector or the FFC is not connected properly. Or, the wire, FFC, the PWB is faulty. Clean the terminal of the connectors on the main PWB, reconnect the connector of the wire, and reconnect the FFC terminal. If the wire or the FFC is faulty, repair or replace them. If not resolved, replace the main PWB.
Code: C0120
Description: MAC address data error
Causes: The MAC address data is incorrect.
Remedy: 1 Resetting the main power The flash memory does not operate properly. Turn off the power switch and unplug the power plug. After 5s passes, reconnect the power plug and turn on the power switch. 2 Checking the MAC address The MAC address is incorrect. Replace the main PWB when the MAC address is not indicated on the network status page.
Code: C0130
Description: Backup memory reading/writing error
Causes: The reading or writing into the flash memory is unavailable.
Remedy: 1 Resetting the main power The flash memory does not operate properly. Turn off the power switch and unplug the power plug. After 5s passes, reconnect the power plug and turn on the power switch. 2 Checking the main PWB The connector or the FFC is not connected properly. Or, the wire, FFC, the PWB is faulty. Clean the terminal of the connectors on the main PWB, reconnect the connector of the wire, and reconnect the FFC terminal. If the wire or the FFC is faulty, repair or replace them. If not resolved, replace the main PWB.
Code: C0140
Description: Backup memory data error
Causes: The flash memory data read at the initial start-up is faulty
Remedy: 1 Resetting the main power The flash memory does not operate properly. Turn off the power switch and unplug the power plug. After 5s passes, reconnect the power plug and turn on the power switch. 2 Checking the main PWB The connector or the FFC is not connected properly. Or, the wire, FFC, the PWB is faulty. Clean the terminal of the connectors on the main PWB, reconnect the connector of the wire, and reconnect the FFC terminal. If the wire or the FFC is faulty, repair or replace them. If not resolved, replace the main PWB.
Causes: 1. Continuous five times detection of no response from the device for 5ms or more on reading / writing. 2. Data read twice do not match continuous 8 times. 3. Writing data and reading data do not match continuous 8 times.
Remedy: 1 Resetting the main power The EEPROM on the engine PWB does not operate properly. Turn off the power switch and unplug the power plug. After 5s passes, reconnect the power plug and turn on the power switch. 2 Checking the EEPROM on the engine PWB The EEPROM is not properly attached. Reattach the EEPROM on the engine PWB. 3 Replacing the EEPROM The EEPROM is faulty. 1. Print Maintenance Report at U000 beforehand. 2. Replace the EEPROM on the engine PWB. C6990 appears when turning the power on. Execute U169 at that state. 3. Then, print Maintenance Report at U000. Compare the setting values with Maintenance Report printed before and change the different values. (Target maintenance mode: U063, U100, U127, U140, U161, U465, U468 and U901, etc.) 4. Check the output image and adjust the image at U410, U411, etc. if necessary. 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB.