• Code: C-6722
• Description: A PWM gamma curve is not created properly.
• Causes: Toner control sensor board (TCSB)

• Code: C-6801
• Description: The communication between the overall control board (OACB) and the operation board /1 (PWB1) does not start after the power switch (SW2) turns ON.
• Causes: Overall control board (OACB) Operation board /1 (PWB1)

• Code: C-8101
• Description: The conveyance roller pressure/ release home sensor (PS308) does not turns OFF within a specified period of time after the conveyance roller pressure/ release motor (M4) starts its operation.
• Causes: Scanner drive board (SDB) Conveyance roller pressure/ release motor (M4) Conveyance roller pressure/ release home sensor (PS308)

• Code: C-8301
• Description: The EM signal of the cooling fan (FM1) shows an abnormal condition when a specified period of time elapses after FM1 turns ON. This abnormal condition recurs when a specified period of time elapses after FM1 is turned OFF and then ON again.
• Causes: Scanner drive board (SDB) Cooling fan (FM1)

• Code: C-B001 ... C-B188
• Description: FAX breakdown
• Causes: FK-502

• Code: C-C101
• Description: The printer control board (PRCB) does not answer after a specified period of time when the power switch (SW2) is ON.
• Causes: Printer control board (PRCB)

• Code: C-C102
• Description: Printer control board (PRCB) communication error.
• Causes: Printer control board (PRCB)

• Code: C-C103
• Description: Operation panel communication error.
• Causes: Operation board /1 (PWB1)