• Code: E7-28
• Description: LSU control Asic connection error
• Causes: Improper connection of the communication connector between the PCU PWB and the MFPC PWB. Harness trouble between the PCU PWB and the MFPC PWB PCU PWB or MFPC PWB trouble.
• Remedy: Check connection of the connector and the harness between the PCU PWB and the MFPC PWB. Replace the MFPC PWB. Replace the PCU PWB.

• Code: E7-49
• Description: Water Mark data error
• Causes: Watermark data trouble. HDD trouble. * When the wartermark data is not installed, U2-60 error occurs in booting.
• Remedy: Use SIM62-02/SIM62-03 to check HDD read/write. If the result is NG, a remedy corresponding to E7-03 is required. Use SIM49-05 to update the watermark data. (Reinstallation)

• Code: E7-50
• Description: PCU connection trouble
• Causes: A PWB/firmware which does not comply with the machine specifications is connected.
• Remedy: Check the kind and the version of the firmware. LSU connection trouble. PCU PWB trouble. LSU trouble.

• Code: E7-55
• Description: PCU PWB information sum error
• Causes: PCU EEPROM sum check error. PCU EEPROM trouble. PCU EEPROM contact trouble.
• Remedy: Replace the PCU PWB. Replace the PCU EEPROM.

• Code: E7-60
• Description: MFP connection trouble
• Causes: A PWB/firmware which does not comply with the machine specifications is connected.
• Remedy: Check the kind and the version of the firmware. MFPC PWB trouble.

• Code: E7-61
• Description: MFP connection trouble (PCU)
• Causes: Combination error between the MFPC PWB and the PCU.
• Remedy: Check the MFPC PWB. Check the combination between the MFPC PWB and the PCU.

• Code: E7-62
• Description: MFP connection trouble
• Causes: Combination error between the MFPC PWB and the SCU.
• Remedy: Check the MFPC PWB. Check the combination between the MFPC PWB and the SCU.

• Code: E7-80
• Description: MFP - SCU PWB communication error
• Causes: SCU PWB - MFPC PWB connection trouble. SCU PWB trouble. MFPC PWB trouble.
• Remedy: Check connection of the SCU PWB and the MFPC PWB. Check the ground. Replace the SCU PWB. Replace the MFPC PWB.