• Code: E7-A1
• Description: LSU EEP ROM/LD-driver read/write error (C)
• Causes: EEPROM/LD-driver trouble. EEPROM/LD-driver access circuit trouble.
• Remedy: Check connection between PCU PWB and LSU PWB. Check the LSU PWB and replace the PCU PWB. Replace the LSU.

• Code: E7-A2
• Description: LSU EEP ROM/LD-driver read/write error (M)
• Causes: EEPROM/LD-driver trouble. EEPROM/LD-driver access circuit trouble.
• Remedy: Check connection between PCU PWB and LSU PWB. Check the LSU PWB and replace the PCU PWB. Replace the LSU.

• Code: E7-A3
• Description: LSU EEP ROM/LD-driver read/write error (Y)
• Causes: EEPROM/LD-driver trouble. EEPROM/LD-driver access circuit trouble.
• Remedy: Check connection between PCU PWB and LSU PWB. Check the LSU PWB and replace the PCU PWB. Replace the LSU.

• Code: E7-A7
• Description: mSATA SSD trouble
• Causes: mSATA SSD trouble. Improper connection of mSATA SSD. SCN-MFP PWB trouble. Data error of the file system management part.
• Remedy: Remove and insert the mSATA SSD. Replace the mSATA SSD. Replace the SCN-MFP PWB.

• Code: EE-EC
• Description: Automatic toner density adjustment error
• Causes: Toner density sensor trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the PCU PWB.

• Code: EE-EL
• Description: Automatic toner density adjustment error (Over toner)
• Causes: Toner density sensor trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the PCU PWB.

• Code: EE-EU
• Description: Automatic toner density adjustment error (Under toner)
• Causes: Toner density sensor trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the PCU PWB.

• Code: F1-00
• Description: Finisher - PCU PWB communication error
• Causes: Connection trouble of the connector and the harness between the finisher and the PCU PWB. Finisher control PWB trouble. PCU PWB trouble.
• Remedy: Check the connector and the harness between the finisher and the PCU PWB. Replace the finisher control PWB. Replace the PCU PWB.