• Code: E7-20
• Description: LSU laser detection error
• Causes: Laser optical axis misalignment Reduced laser power, lighting error, laser diode trouble. LSU harness, connector trouble LSU trouble
• Remedy: Use SIM61-1 to check the operation of the LSU. Check or replace the LSU control PWB. Check connection of the LSU harness. Replace the LSU.

• Code: E7-21
• Description: LSU LD deterioration trouble
  Laser trouble
• Causes: Laser deterioration, power reduction Disconnection or improper connection of harness and connector between LD PWB and MFPC PWB.
• Remedy: Use SIM61-1 to check the operation of the LSU. Check connection of the harness of each PWB inside the LSU. Replace the MFPC PWB. Replace the LSU.

• Code: E7-28
• Description: LSU control Asic connection error
  Access error between the CPU in the PCU PWB and the LSU control ASIC.
• Causes: Improper connection of the communication connector between the PCU PWB and the MFPC PWB (interface PWB). Harness trouble between the PCU PWB and the MFPC PWB (interface PWB) PCU PWB or MFPC PWB (interface PWB) trouble.
• Remedy: Check connection of the connector and the harness between the PCU PWB and the MFPC PWB (interface 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
  Unknown PWB identification information is detected in the PCU PWB.
• 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
  PCU EEPROM 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
  Unknown PWB identification information is detected in the MFPC PWB.
• 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)
  MFP connection trouble
  Compatibility trouble between MFP - 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.