• Code: C74
• Description: Reverse sensor adjustment error
• Remedy: (1) Check if there is any foreign object between the reverse sensor and reflecting mirror. Check if the reflecting mirror is dirty. (2) Check if the harness connecting the reverse sensor and ADF control board is open-circuited. (3) Check the circuits and connectors on the ADF control board, mainly IC3, IC4 and CN4, for short- and open-circuits. (4) Replace the reverse sensor. (5) Replace the ADF control board. (6) Initialize the EEPROM and perform the automatic sensor adjustment of the ADF.

• Code: C81
• Description: Fan motor is abnormal
• Remedy: (1) Check if the load on the motor shaft is normal. (2) Remove foreign objects. (3) Check if the harness connecting the fan motor and ADF control board is open-circuited. (4) Check if the power is supplied to the pin 1 of the CN9 on the ADF control board during the operation. (5) Check the circuits and connectors on the ADF control board, mainly Q12 and Q16, for open-and shortcircuits. (6) Replace the ADF control board. (7) Replace the fan motor.

• Code: C82
• Description: Read sensor adjustment error
• Remedy: (1) Check if there is any foreign object between the read sensor and the reflecting mirror. Check if the reflecting mirror is dirty. (2) Check if the harness connecting the read sensor and the ADF control board is open-circuited. (3) Check the circuits and connectors on the ADF control board, mainly IC3, IC4 and CN6, for short- and open-circuited. (4) Replace the read sensor. (5) Replace the ADF control board. (6) Initialize the EEPROM and perform automatic sensor adjustment of the ADF.

• Code: C83
• Description: Original length sensor adjustment error
• Remedy: (1) Check if there is any foreign object between the original length sensor and reflecting mirror. Check if the reflecting mirror is dirty. (2) Check if the harness connecting the original length sensor and the ADF control board is open-circuited. (3) Check the circuits and connectors on the ADF control board, mainly IC3, IC4 and CN3, for short- and open-circuits. (4) Replace the original length sensor. (5) Replace the ADF control board. (6) Initialize the EEPROM and perform the automatic sensor adjustment of the ADF.

• Code: C94
• Description: Main CPU is abnormal
• Remedy: Is the “Call for Service” displayed even after the main switch is turned OFF and back ON ? NO Leave it and see what happens. YES 1. Check if the circuit pattern between the main CPU and MROM is short- or open-circuited. 2. Replace the LGC board if this error occurs frequently.

• Code: CA1
• Description: Polygonal motor is abnormal
• Remedy: Is the polygonal motor rotating? NO 1. Check if the connector J302 on the LGC board is disconnected. 2. Check if the connector J203 on the POL board is disconnected. 3. Check if the harness is open-circuited and the connector pin is disconnected. 4. Check if the conductor pattern on the LGC board is short- or open-circuited. 5. Replace the laser optical unit. 6. Replace the LGC board. YES Are the pins-3 and -4 of the connector J203 on the POL board always level “L”? NO 1. Check if the conductor pattern on the LGC board is short- or open-circuited. 2. Replace the laser optical unit. 3. Replace the LGC board. YES 1. Check if the conductor pattern on the LGC board is short- or open-circuited. 2. Replace the LGC board.

• Code: CA2
• Description: H-Sync detection error
• Remedy: Are the harness connecting the connector (J308) on the LGC board and connector (J202) on the SNS board open-circuited? Are the connectors disconnected? YES Replace the harness. Connect the disconnected connectors. NO 1. Replace the LGC board. 2. Replace the laser optical unit.

• Code: CB1
• Description: Feed motor is abnormal
• Remedy: MJ-1012/1013 (Finsher section) [Procedure 1] Is second feed motor (M8) rotating in reverse at the fixed timing? NO Replace second feed motor or finisher controller PC board. YES Is the shutter securely attached to the shutter upper/lower bars? NO Attach it securely. YES Turn the feed roller-2 in reverse by hand. Do the shutter upper/lower bars move up and down? NO Fix the mechanism including the shutter upper/lower bars and gears of the feed roller-2. YES Is the shutter closed detecting switch (MS4) working normally? NO Replace the switch. YES Replace the finisher controller PC board. [Procedure 2] Is second feed motor (M8) rotating in reverse at the fixed timing? NO Replace second feed motor or finisher controller PC board. YES Is the shutter securely attached to the shutter upper/lower bars? NO Attach it securely. YES Turn feed roller-2 in reverse by hand. Do the shutter upper/lower bars move up and down? NO Fix the mechanism including the shutter upper/lower bars and gears of the feed roller-2. YES Is the shutter open sensor (PI5) working normally? NO Replace the sensor. YES Replace the finisher controller PC board. [Procedure 3] Check the safety zone switch (MS3). Is the switch working normally? NO Replace the switch. YES Is the safety zone switch (MS3) correctly pressed? NO Fix the mechanism. YES Is the shutter closed detecting switch (MS4) working normally? NO Replace the switch. YES Is the shutter closed detecting switch (MS4) correctly pressed? NO Fix the mechanism. YES Replace the finisher controller PC board.