Step
Check description
Assumed cause
Measures
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 5 s 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 before and
2. Replace the EEPROM on the engine PWB. C8990 appears when turning the power on. Execute U169 at that state.
3. Then, print Maintenance Report at U000. Compare the setting up to the 100 mm FFC, the 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
2. Replace the EEPROM on the engine PWB. C8990 appears when turning the power on. Execute U169 at that state.
3. Then, print Maintenance Report at U000. Compare the setting up to the 100 mm FFC, the 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