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Code :

Code: U2 12
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.

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