• Code: E7-20
• Description: LSU laser detection error
• Causes: Optical axis shift. Reduced laser power, lighting error, laser diode trouble. Harness and connector trouble between the LD/BD PWB and the LSU control PWB.
• Remedy: Use SIM61-1 to check the operation of the LSU. Check the PWB and connection of the harness in the LSU. Replace the LSU.

• Code: E7-21
• Description: LSU laser deterioration trouble
• Causes: Power reduction due to laser deterioration. Harness and connector disconnection/insertion trouble between the LD PWB and the LSU control PWB.
• Remedy: Use SIM61-1 to check the operation of the LSU. Check the PWB and connection of the harness in the LSU. Replace the LSU.

• Code: E7-28
• Description: LSU-PCU connection error
• Causes: Communication error between the CPU in the PCU PWB and the LSU control ASIC. Improper connection of the communication connector between the PCU PWB and the LSU control PWB (interface PWB). Harness trouble between the PCU PWB and the LSU control PWB (interface PWB) PCU PWB or LSU control PWB (interface PWB) trouble
• Remedy: Check connection of the connector and the harness between the PCU PWB and the LSU control PWB (interface PWB). Replace the LSU control PWB. Replace the PCU PWB.

• Code: E7-29
• Description: LSU ASIC frequency error
• Causes: Oscillation abnormality of the external oscillator and the internal oscillating circuit used in the LSU ASIC. LSU ASIC abnormality on the LSU ASIC PWB.
• Remedy: Replace the LSU control PWB.

• Code: E7-31
• Description: MFP Flash memory access error
• Causes: Read/write error for the MFP Flash memory Target data • Address book data • Part of the key operator program • Copy job program • Part of the user authentication data • Sender record, etc. MFP Flash memory error MFP Flash memory contact error Malfunctions caused by noises Saved data are garbled.
• Remedy: Check the following data for any abnormality. If there is any abnormality, reset and register the content. • Part of the key operator program • Copy job program • Part of the user authentication data • Image send series registration data (Sender record) Replace the MFP PWB. When the main power is turned OFF/ON in a machine without HDD installed, if an error occurs again, execute SIM62-01. If the trouble is not canceled by this procedure, replace the MFP PWB.

• Code: E7-42
• Description: Data error (ACRE ASIC)
• Causes: Image transfer trouble.
• Remedy: Check the connection state of the ACRE ASIC PWB connector. Replace the ACRE ASIC PWB.

• Code: E7-46
• Description: Decode error (ACRE ASIC)
• Causes: Compression data abnormality. Garbled data are produced in image compression/ transmission. ACRE ASIC PWB trouble.
• Remedy: Check the installation state of the PWB. Check connection of the ACRE ASIC PWB. Replace the ACRE ASIC PWB.

• Code: E7-48
• Description: Memory error (ACRE ASIC)
• Causes: DIMM trouble, memory slot trouble. DIMM insertion trouble, different DIMM inserted.
• Remedy: DIMM trouble. Replace the PWB.