• Code: E7-10
• Description: Shading trouble (Black correction)
  CCD black scan level abnormality when the copy lamp is turned off.
• Causes: Installation error of the CCD unit flat cable CCD unit abnormality SCU PWB abnormality
• Remedy: Case 1 Cause Installation error of the CCD unit flat cable Check and remedy Check the installing state of the flat cable to the CCD unit. Case 2 Cause CCD unit abnormality Check and remedy Check the CCD unit. Case 3 Cause SCU PWB abnormality Check and remedy Check the SCU PWB.

• Code: E7-11
• Description: Shading trouble (White correction)
  CCD white scan level abnormality when the copy lamp is on.
• Causes: Installation error of the CCD unit flat cable Dirt on the mirror, the lens, or the reference white plate. Copy lamp lighting trouble CCD unit abnormality SCU PWB abnormality
• Remedy: Case 1 Cause Installation error of the CCD unit flat cable Check and remedy Check the installing state of the flat cable to the CCD unit. Case 2 Cause Dirt on the mirror, the lens, or the reference white plate. Check and remedy Clean the mirror, the lens, or the reference white plate. Case 3 Cause Copy lamp lighting trouble Check and remedy Check the installing state of the flat cable to the copy lamp unit. Case 4 Cause CCD unit abnormality Check and remedy Check the CCD unit. Case 5 Cause SCU PWB abnormality Check and remedy Check the SCU PWB.

• Code: E7-14
• Description: SCAN-ASIC trouble
  Written register value cannot be read correctly
• Causes: SCU PWB abnormality
• Remedy: Check the SCU PWB.

• Code: E7-20
• Description: LSU BD detection trouble
  LSU BD signal is not detected.
• Causes: Disconnection or improper connection of harness and connector between LD/BD PWB and LSUcnt PWB
  1) Optical axis shift 2) BK laser deterioration, power reduction 3) BD PWB trouble
• Remedy: Case 1 Cause Disconnection or improper connection of harness and connector between LD/BD PWB and LSUcnt PWB Check and remedy Check connection of the harness of each PWB inside the LSU. Case 2 Cause 1) Optical axis shift 2) BK laser deterioration, power reduction 3) BD PWB trouble Check and remedy 1) Use SIM61-1 to check the LSU operation. 2) Replace the LSUcnt/BD PWB. 3) If the trouble cannot be removed by the above 1) to 2), replace the LSU.

• Code: E7-21
• Description: LSU LD deterioration trouble
  The color laser does not light up normally.
• Causes: Disconnection or improper connection of harness and connector between LD PWB and LSUcnt PWB Y/M/C laser deterioration
• Remedy: Case 1 Cause Disconnection or improper connection of harness and connector between LD PWB and LSUcnt PWB Check and remedy Check connection of the harness of each PWB inside the LSU. Case 2 Cause Y/M/C laser deterioration Check and remedy 1) Use SIM61-1 to check the LSU operation. 2) Replace the LSUcnt PWB. 3) If the trouble cannot be removed by the above 1) to 2), replace the LSU.

• Code: E7-28
• Description: LSU control ASIC connection abnormality
  Access error between the CPU of the PCU PWB and the LSU control ASIC
• Causes: <When this trouble occurs in the initial process on turn on the power> Communication connector trouble between the PCU PWB and the LSUcnt PWB (interface PWB). Harness trouble.
  <When this trouble occurs on starting printing/during printing, and SIM61-1 is used to check the LSU unit operation for each of B/W and COLOR and the judgment is NG.> Connected the connector between the PCU PWB and the LSUcnt PWB (interface PWB) / Harness trouble
  PCU PWB or LSUcnt PWB (interface PWB) trouble
• Remedy: Case 1 Cause <When this trouble occurs in the initial process on turn on the power> Communication connector trouble between the PCU PWB and the LSUcnt PWB (interface PWB). Harness trouble. Check and remedy Check the connector connection between the PCU PWB and the LSUcnt PWB (interface PWB). Check the harness. If the trouble cannot be removed, replace the LSUcnt PWB or the PCU PWB. Case 2 Cause <When this trouble occurs on starting printing/during printing, and SIM61-1 is used to check the LSU unit operation for each of B/W and COLOR and the judgment is NG.> Connected the connector between the PCU PWB and the LSUcnt PWB (interface PWB) / Harness trouble Check and remedy Check the harness between the PCU PWB and the LSUcnt PWB (interface PWB). If the trouble cannot be removed, replace the LSUcnt PWB or the PCU PWB. Case 3 Cause PCU PWB or LSUcnt PWB (interface PWB) trouble Check and remedy Replace the PCU PWB or the LSUcnt PWB (interface PWB).

• Code: E7-29
• Description: LSU-ASIC frequency abnormality
  Oscillation trouble of the external oscillator used in LSU-ASIC and the internal oscillation circuit
• Causes: Trouble of the oscillator on the LSU-ASIC PWB, the resistor and capacitor for the oscillation circuit, and the LSU-ASIC itself.
• Remedy: Replace the LSUcnt PWB.

• Code: E7-50
• Description: Engine connection trouble
  Unknown PWB identification information is detected in the PCU PWB.
• Causes: A PWB which is incompatible with the machine specifications is connected. A firmware which is incompatible with the machine specifications is used.
• Remedy: Case 1 Cause A PWB which is incompatible with the machine specifications is connected. Check and remedy 1) Replace the PCU PWB. 2) Replace the LSU PWB. Case 2 Cause A firmware which is incompatible with the machine specifications is used. Check and remedy Check the kind and the version of the firmware.