• Code: C72
• Description: Error of aligning sensor adjustment
• Remedy: (1) Check between the aligning sensor and the reflection mirror for foreign objects, and the reflection mirror for dirt. (2) Check the harness between the aligning sensor and the LGC board for breaks. (3) Check mainly IC4, IC5 and CN6 on the LGC board for breaks and short-circuits. (4) Replace the aligning sensor. (5) Replace the LGC board. (6) Initialize the ADF EEPROM, and perform automatic sensor adjustment.

• Code: C73
• Description: EEPROM initializing error
• Remedy: (1) Check mainly IC1 on the LGC board for breaks and short-circuits. (2) Replace the LGC board. (3) Initialize the ADF EEPROM, and perform automatic sensor adjustment.

• Code: C74
• Description: Error of exit sensor adjustment
• Remedy: (1) Check between the exit sensor and the reflection mirror for foreign objects, and the reflection mirror for dirt. (2) Check the harness between the exit sensor and the LGC board for breaks. (3) Check mainly IC4, IC5 and CN7 on the LGC board for breaks and short-circuits. (4) Replace the exit sensor. (5) Replace the LGC board. (6) Initialize the ADF EEPROM, and perform automatic sensor adjustment.

• Code: C76
• Description: Transmission time-out error
• Remedy: (1) Check the harness between the ADF control PC board and the scanner control PC board for disconnections or breaks. (2) Check mainly the IC2, IC3, IC14, CN1 on the ADF control PC board for breaks and shortcircuits. (3) Check mainly the IC1, IC7, J8 on the scanner control PC board for disconnections and shortcircuits. (4) Replace the ADF control PC board. (5) Replace the scanner control PC board (SLG board).

• Code: C77
• Description: Transmission buffer full
• Remedy: (1) Check the harness between the ADF control PC board and the scanner control PC board for disconnections or breaks. (2) Check mainly the IC2, IC3, IC14, CN1 on the ADF control PC board for breaks and shortcircuits. (3) Check mainly the IC1, IC7, J8 on the scanner control PC board for disconnections and shortcircuits. (4) Replace the ADF control PC board. (5) Replace the scanner control PC board (SLG board).

• Code: C78
• Description: ADF power ON I/F error
• Remedy: (1) Check the harness between the ADF control PC board and the scanner control PC board for disconnections or breaks. (2) Check mainly the IC2, IC3, IC14, CN1 on the ADF control PC board for breaks and shortcircuits. (3) Check mainly the IC1, IC7, J8 on the scanner control PC board for disconnections and shortcircuits. (4) Replace the ADF control PC board. (5) Replace the scanner control PC board (SLG board).

• Code: C79
• Description: Reception time-out error
• Remedy: (1) Check the harness between the ADF control PC board and the scanner control PC board for disconnections or breaks. (2) Check mainly the IC2, IC3, IC14, CN1 on the ADF control PC board for breaks and shortcircuits. (3) Check mainly the IC1, IC7, J8 on the scanner control PC board for disconnections and shortcircuits. (4) Replace the ADF control PC board. (5) Replace the scanner control PC board (SLG board).

• Code: C80
• Description: Error of timing sensor adjustment
• Remedy: (1) Check between the timing sensor and the reflection mirror for foreign objects, and the reflection mirror for dirt. (2) Check the harness between the timing sensor and the LGC board for breaks. (3) Check mainly IC4, IC5 and CN6 on the LGC board for breaks and short-circuits. (4) Replace the timing sensor. (5) Replace the LGC board. (6) Initialize the ADF EEPROM, and perform automatic sensor adjustment. [Procedure 3] Check safety area detection switch (MS3). Is the switch normal? No Replace the switch. Yes Is safety area detection switch (MS3) correctly pressed? No Correct the mechanical mechanism. Yes Is shutter close detection switch (MS4) normal? No Replace the switch. Yes Is shutter close detection switch (MS4) correctly pressed? No Correct the mechanical mechanism. Yes Replace the finisher controller board.