• Code: E7-21
• Description: LSU laser degradation error
• 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.

• Code: E7-24
• Description: LSU LD driver trouble (K)
• Causes: Reduced laser power, lighting error, laser diode trouble. LSU connector trouble. LD PWB/LSU control PWB trouble.
• Remedy: Use SIM61-01 to check the operations of the LSU. Check or replace the LSU control PWB. Check connection of the LSU harness. Replace the LSU.

• Code: E7-28
• Description: Connection error between PCU and LSU
• 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 trouble. LSU control PWB trouble. LSU trouble.
• Remedy: Check connection of the connector and the harness between the PCU PWB and the LSU control PWB. Replace the LSU control PWB. Replace the PCU PWB. Replace the LSU.

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

• Code: E7-42
• Description: Image data error (ACRE ASIC)
• Causes: An image data error occurs. An image data send error occurs. Scanner expansion PWB (ACRE) connection trouble. Scanner expansion PWB (ACRE) trouble. MFPC PWB trouble
• Remedy: Check connection of the scanner expansion PWB (ACRE). Check the scanner expansion PWB (ACRE), and replace if necessary. Check the MFPC PWB, and replace if necessary.

• Code: E7-46
• Description: Image data decode error (ACRE ASIC)
• Causes: A decode error occurs while high compression PDF images are made. (garbled data) Scanner expansion PWB (ACRE) connection trouble. Scanner expansion PWB (ACRE) trouble. MFPC PWB trouble.
• Remedy: Check connection of the scanner expansion PWB (ACRE). Check the scanner expansion PWB (ACRE), and replace if necessary. Check the MFPC PWB, and replace if necessary.

• Code: E7-47
• Description: Combination error between MFP and ACRE firmware (ACRE ASIC)
• Causes: Connect to the scanner expansion PWB (ACRE) with the firmware which does not support MFP PWB
• Remedy: Update the firmware on SIM49-1 or SIM49-10.

• Code: E7-48
• Description: Scanner expansion (ACRE ASIC) memory error
• Causes: Scanner expansion PWB (ACRE) DIMM trouble, memory slot trouble. Scanner expansion PWB (ACRE) DIMM insertion trouble. Scanner expansion PWB (ACRE) connection trouble. Scanner expansion PWB (ACRE) trouble. MFPC PWB trouble.
• Remedy: Check insertion of the scanner expansion PWB (ACRE) DIMM memory. Check the scanner expansion PWB (ACRE) DIMM memory, and replace if necessary. Check connection of the scanner expansion PWB (ACRE). Check the scanner expansion PWB (ACRE), and replace if necessary. Check the MFPC PWB, and replace if necessary.