• Code: 310.369
• Description: IH Driver Communication Fault. Communication error between the IH Driver and the MCU PWB has occurred. (Status code 0xC is received. Or, communication error between the DD and the IH was detected)
• Remedy: 1. Turn the power Off and On. If the error doesn't clear, go to step 2. 2. Turn the power Off and check the connection between the MCU PWB P/J414 and the IH Driver PWB P/J530 for open circuit, short circuit, and poor contact. 3. If no problems are found, replace the following parts in sequence: • IH Driver PWB • MCU PWB

• Code: 310.370
• Description: IH Driver Freeze Fault. The IH Driver Freeze port became Active (Low). (The CPU of the IH Driver has hanged.)
• Remedy: 1. Turn the power Off and On. If the error doesn't clear, go to step 2. 2. Turn the power Off and check the connection between the MCU PWB P/J414 and the IH Driver PWB P/J530 for open circuit, short circuit, and poor contact. 3. If no problems are found, replace the following parts in sequence: • IH Driver PWB • MCU PWB

• Code: 310.371
• Description: Heat Belt STS Center Disconnection Fault. The open circuit AD value of the Center Thermistor was detected 3 times in a row.
• Remedy: • Turn the power Off and remove the Fuser Assembly. Inspect the Drawer Connector between the Fuser Assembly and the Main Unit ( DJ600) for broken/bent pins, foreign substances, burns, and etc. • Check whether the MCU PWB connector P/J431 is connected properly.
  Measure the resistance between Fuser Assembly P600-A7 and P600-A8. Is the resistance infinite? Y↓ N→Check the following connections for open circuits, short circuits, and poor contacts. • Between DJ600-A5 and MCU PWB P/J431-7 • Between DJ600-A4 and MCU PWB P/J431-8 If no problems are found, replace the MCU PWB. Replace the Fuser Assembly.

• Code: 310.372
• Description: Heat Roll STS Center Over Temperature Fault. The AD value of the Center Thermistor was detected to be higher than the defined value 4 times in a row.
• Remedy: • Turn the power Off and remove the Fuser Assembly. Check whether foreign substances or paper is wound around the Heat Roll. • Inspect the Drawer Connector between the Fuser Assembly and the Main Unit ( DJ600) for broken/bent pins, foreign substances, burns, and etc. • Check whether the MCU PWB connector P/J431 is connected properly.
  Check the following connections for short circuits and poor contacts. • Between DJ600-A5 and MCU PWB P/J431-7 • Between DJ600-A4 and MCU PWB P/J431-8 If no problems are found, replace the following parts in sequence: • Fuser Assembly • MCU PWB

• Code: 310.373
• Description: Heat Belt STS Rear Disconnection Fault. The open circuit AD value of the Rear Thermistor was detected 3 times in a row.
• Remedy: • Turn the power Off and remove the Fuser Assembly. Inspect the Drawer Connector between the Fuser Assembly and the Main Unit ( DJ600) for broken/bent pins, foreign substances, burns, and etc. • Check whether the MCU PWB connector P/J431 is connected properly.
  Measure the resistance between Fuser Assembly P600-A9 and P600-A10. Is the resistance infinite? Y↓ N→Check the following connections for open circuits, short circuits, and poor contacts. • Between DJ600-A3 and MCU PWB P/J431-9 • Between DJ600-A2 and MCU PWB P/J431-10 If no problems are found, replace the MCU PWB. Replace the Fuser Assembly.

• Code: 310.374
• Description: Heat Belt STS Rear Over Temperature Fault. The AD value of the Rear Thermistor was detected to be higher than the defined value 4 times in a row.
• Remedy: • Turn the power Off and remove the Fuser Assembly. Check whether foreign substances or paper is wound around the Heat Roll. • Inspect the Drawer Connector between the Fuser Assembly and the Main Unit ( DJ600) for broken/bent pins, foreign substances, burns, and etc. • Check whether the MCU PWB connector P/J431 is connected properly.
  Check the following connections for short circuits and poor contacts. • Between DJ600-A3 and MCU PWB P/J431-9 • Between DJ600-A2 and MCU PWB P/J431-10 If no problems are found, replace the following parts in sequence: • Fuser Assembly • MCU PWB

• Code: 310.375
• Description: Heat Belt STS Center Warm Up Time Fault. When transitioning from the Wait state, the specified Temperature is not reached within the specified time.
• Remedy: Enter dc122 Fault History. Check whether IH Driver Input Low Voltage Fault has occurred. Has Fault 310.361 occurred? Y↓ N→Turn the power Off and check the following: • Remove the Fuser Assembly. Inspect the Drawer Connector between the Fuser Assembly and the Main Unit ( DJ600) for broken/bent pins, foreign substances, burns, and etc. • The connection between the DJ600-A4/A5 and the MCU PWB P/J431-8/7 for open circuit, short circuit, and poor contact If no problems are found, replace the following parts in sequence: • Fuser Assembly • MCU PWB Proceed to the 310.361 RAP.

• Code: 310.376
• Description: Heat Belt STS Rear Warm Up Time Fault. When transitioning from the Wait state, the specified Temperature is not reached within the specified time.
• Remedy: 1. Turn the power Off and On. If the error does not clear, continue to step 2. 2. Turn the power Off and check the following: • Remove the Fuser Assembly. Inspect the Drawer Connector between the Fuser Assembly and the Main Unit ( DJ600) for broken/bent pins, foreign substances, burns, and etc. • The connection between the DJ600-A2/A3 and the MCU PWB P/J431-10/9 for open circuit, short circuit, and poor contact If no problems are found, replace the following parts in sequence: • Fuser Assembly • MCU PWB