Description: Adjustment value check sum error (EEPROM). Check sum error of the adjustment value area in the EEPROM
Causes: EEPROM abnormality
Remedy: Check that the EEPROM is properly set. Use SIM 16 to cancel the trouble. Replace the MCU PWB.
Code: U2 40
Description: CRUM chip communication error. An error occurs during communication between the MCU and the CRUM chip. The CRUM identification error occurs.
Causes: CRUM chip abnormality Developing unit disconnection MCU PWB abnormality
Remedy: Replace the toner cartridge. Check installation of the developing unit. Use SIM16 to cancel. Replace the MCU PWB.