• Code: E7 23
• Description: LED controller initial trouble (Yellow)
• Causes: The initial process of the LED controller cannot be completed properly.
• Remedy: Case 1 Cause Disconnection of the LED head connector Check & Remedy Check connection of the LED head connector. Case 2 Cause Disconnection of the harness inside the LED head. Check & Remedy Replace the LED head unit. Case 3 Cause ICU PWB abnormality Check & Remedy Replace the ICU PWB.

• Code: E7 24
• Description: LED controller output trouble (Black)
• Causes: When printing, the print end signal for each page is not properly provided
• Remedy: Case 1 Cause Disconnection of the LED head connector. Check & Remedy Check connection of the LED head connector. Case 2 Cause Disconnection of the harness inside the LED head. Check & Remedy Replace the LED head unit. Case 3 Cause ICU PWB abnormality Check & Remedy Replace the ICU PWB.

• Code: E7 25
• Description: LED controller output trouble (Cyan)
• Causes: When printing, the print end signal for each page is not properly provided.
• Remedy: Case 1 Cause Disconnection of the LED head connector. Check & Remedy Check connection of the LED head connector. Case 2 Cause Disconnection of the harness inside the LED head. Check & Remedy Replace the LED head unit. Case 3 Cause ICU PWB abnormality Check & Remedy Replace the ICU PWB.

• Code: E7 26
• Description: LED controller output trouble (Magenta)
• Causes: When printing, the print end signal for each page is not properly provided.
• Remedy: Case 1 Cause Disconnection of the LED head connector. Check & Remedy Check connection of the LED head connector. Case 2 Cause Disconnection of the harness inside the LED head. Check & Remedy Replace the LED head unit. Case 3 Cause ICU PWB abnormality Check & Remedy Replace the ICU PWB.

• Code: E7 27
• Description: LED controller output trouble (Yellow)
• Causes: When printing, the print end signal for each page is not properly provided.
• Remedy: Case 1 Cause Disconnection of the LED head connector Check & Remedy Check connection of the LED head connector. Case 2 Cause Disconnection of the harness inside the LED head. Check & Remedy Replace the LED head unit Case 3 Cause ICU PWB abnormality Check & Remedy Replace the ICU PWB.

• Code: E7 28
• Description: LED control ASIC connection abnormality
• Causes: Access error between the PCU PWB CPU and the LED control ASIC
• Remedy: Case 1 Cause Disconnection of the ICU/ PCU PWB communication connector Check & Remedy Check connection of the ICU/PCU PWB communication connector Case 2 Cause ICU/PCU PWB communication harness trouble. Check & Remedy Check the ICU/PCU PWB communication harness. Case 3 Cause ICU PWB/PCU PWB trouble Check & Remedy Check grounding of the machine. Replace the IC

• Code: E7 40
• Description: Color correction data write error
• Causes: Data write error to the Nand-Flash for holding color correction data
• Remedy: Case 1 Cause Color correction data rewrite error Check & Remedy Perform rewriting of color correction data again. Case 2 Cause MFP PWB trouble Check & Remedy Replace the MFP PWB.

• Code: E7 41
• Description: Color correction data transfer abnormality
• Causes: Data transfer error from the Nand-Flash for holding color correction data to the FC-RAM for holding color correction image process
• Remedy: Replace the MFP PWB.