• Code: 341.325, 341.330
• Description: MCU PWB F2 Open. Fuse 2 on the MCU PWB has blown.
• Remedy: 1. Check the following parts circuits for overcurrent and overvoltage, and then replace the faulty parts or repair the circuits. • Suction Fan • Bottom Fan • M Fan • 1st BTR Contact Retract Clutch (PL 3.2 Item 12) 2. Turn the power Off and replace the MCU PWB.

• Code: 341.326, 341.331
• Description: MCU PWB F3 Open. Fuse 3 on the MCU PWB has blown.
• Remedy: 1. Check the following parts circuits for overcurrent and overvoltage, and then replace the faulty parts or repair the circuits. • IH Exhaust Fan • Process 2 Fan • Erase Lamp Unit (C, M, Y, K) • MOB ADC Assembly 2. Turn the power Off and replace the MCU PWB.

• Code: 341.327, 341.332
• Description: MCU PWB F4 Open. Fuse 4 on the MCU PWB has blown.
• Remedy: 1. Check the C Fan circuits for overcurrent and overvoltage, and then replace the faulty part or repair the circuits. 2. Turn the power Off and replace the MCU PWB.

• Code: 341.328, 341.333
• Description: MCU PWB F5 Open. Fuse 5 on the MCU PWB has blown.
• Remedy: 1. Check the following parts circuits for overcurrent and overvoltage, and then replace the faulty parts or repair the circuits. • HVPS (1st/2nd/DTC) • HVPS (BCR) • HVPS (Dev) 2. Turn the power Off and replace the MCU PWB.

• Code: 341.340
• Description: MCU NVM (EEPROM) Data Fault. The specific values of the NVM (EEPROM) data are not in their specified addresses.
• Remedy: 1. Turn the power Off and On. 2. Install the correct version of the IOT firmware. 3. Initialize the IOT NVM (includes writing back the adjustment NVM). If the problem persists, replace the MCU PWB.

• Code: 341.341
• Description: MCU NVM (EEPROM) Access Fault. NVM (EEPROM) access error (The read values are different from those that were written, or there is I2C communication error).
• Remedy: 1. Turn the power Off and check whether there is poor connection between the EEPROM and the MCU PWB. If no problems are found, replace the MCU PWB.

• Code: 341.342
• Description: MCU NVM (EEPROM) Buffer Fault. NVM (EEPROM) buffer Fault (The write buffer has overflowed).
• Remedy: 1. Turn the power Off and check whether there is poor connection between the EEPROM and the MCU PWB. If no problems are found, replace the MCU PWB.

• Code: 341.345
• Description: MD PWB F2 Open. Fuse 2 on the MD PWB has blown.
• Remedy: 1. Check the following parts circuits for overcurrent and overvoltage, and then replace the faulty parts or repair the circuits. • LPH Unit (Y, M, C, K) • LPH Rear PWB (Y, M, C, K) 2. Turn the power Off and replace the MD PWB.