• Code: C940
• Description: Circuit related service call Engine-CPU abnormality
• Remedy: Is the “Call for Service” displayed even after the power is turned OFF and back ON? NO Leave it and see what happens. YES 1) Check if the circuit pattern between the Engine-CPU and FROM is short circuited or open circuited. 2) Replace the LGC board if this error occurs frequently.

• Code: C970
• Description: Process related service call High-voltage transformer abnormality: Leakage of the main charger is detected.
• Remedy: (1) Is the main charger installed securely? (2) Check if the spring of high-voltage supply contact point is deformed. (3) Check if the needle electrode is broken or the main charger grid is deformed. (4) Check if any foreign matters is on the needle electrode or the main charger grid. (5) Is the transfer/separation charger installed securely? (6) Check if the transfer/separation charger wire is broken or unhooked. (7) Check if any foreign matter is on the transfer/separation charger wire.

• Code: CA10
• Description: Laser optical unit related service call Polygonal motor abnormality: The polygonal motor is not rotating normally.
• Remedy: Is the polygonal motor rotating? NO 1) Check if the connector of the harness is disconnected between LGC board (CN312) and the laser optical unit. 2) Check if the harness is open circuited and the connector pin is disconnected. 3) Check if the conductor pattern on the LGC board is short circuited or open circuited. 4) Replace the laser optical unit. 5) Replace the LGC board. YES 1) Check if the conductor pattern on the LGC board is short circuited or open circuited. 2) Replace the LGC board.

• Code: CA20
• Description: Laser optical unit related service call. H-Sync detection error: H-Sync detection PC board cannot detect laser beams.
• Remedy: Are the harness open circuited and the connectors disconnected between the LGC board (CN313) and LRL board (CN204), and between the LRL board (CN204) and laser optical unit? YES Replace the harness. Connect the disconnected connectors. NO 1) Replace the LGC board. 2) Replace the laser optical unit.

• Code: CB10
• Description: Transport motor abnormality: The transport motor or stack transport roller is not rotating normally. [MJ-1025]
• Remedy: MJ-1025 Is the stack feed roller (upper) home position sensor (PI12) working properly? NO Replace the sensor. YES Is the wiring between the finisher controller PC board and feed motor (M1) correct? NO Correct the wiring. YES Try turning the stack feed roller (upper) shaft by hand. Does the stack feed roller (upper) move up/down normally? NO Fix the mechanism. YES Try replacing the feed motor (M1). Is the problem corrected? YES End. NO Replace the finisher controller PC board.

• Code: CB20
• Description: Delivery motor abnormality: Delivery motor or delivery roller is not rotating normally. [MJ-1022/1025]
• Remedy: MJ-1022 Rotate the delivery roller by hand. Does it rotate smoothly? NO Fix the mechanism. YES Is the wiring between the finisher controller PC board and delivery motor (M1) correct? NO Correct the wiring. YES Is the delivery motor clock sensor (S1) working properly? NO Replace the sensor. YES 1) Replace the delivery motor (M1). 2) Replace the finisher controller PC board. MJ-1025 Is the delivery belt home position sensor (PI7) working properly? NO Replace the sensor. YES Is the wiring between the finisher controller PC board and delivery motor (M3) correct? NO Correct the wiring. YES Rotate the stack delivery roller by hand. Does it rotate smoothly? NO Fix the mechanism. YES Try replacing the delivery motor (M3). Is the problem corrected? YES END. NO Replace the finisher controller PC board.

• Code: CB30
• Description: Tray lift motor abnormality: The tray lift motor is not rotating normally or the delivery tray is not moving normally. [MJ-1025]
• Remedy: MJ-1025 [Procedure 1] Is the paper surface sensor (PI9) working properly? NO Replace the sensor. YES Is the tray up/down mechanism working properly? NO Fix the mechanism. YES Is 24 VDC supplied from the finisher controller PC board to the shift motor as soon as the tray is driven? NO Replace the finisher controller PC board. YES Is the wiring between the finisher controller PC board and shift motor (M6) correct? YES Replace the shift motor. NO Correct the wiring. [Procedure 2] Is the tray as far as the shift upper limit sensor? YES Lower the position of the tray. NO Is the shift upper limit sensor (PI15) working properly? NO Replace the sensor. YES Is the wiring between the finisher controller PC board and shift upper limit sensor (PI15) correct? YES Replace the finisher controller PC board. NO Correct the wiring. [Procedure 3] Does the tray go up? YES NO Is 24 VDC supplied from the finisher controller PCB to the shift motor as soon as the tray is driven? NO Replace the finisher controller PC board. YES Is there any problem with the tray up/down mechanism? YES Fix the lift mechanism. NO Replace the shift motor. Is the shift motor clock sensor (PI7) working properly? YES Replace the finisher controller PC boar NO Replace the sensor.

• Code: CB50
• Description: Staple motor (staple/fold) abnormality: The staple motor is not rotating normally or the stapler is not moving normally. [MJ-1025]
• Remedy: MJ-1025 [Procedure 1] Is the wiring between the finisher controller PC board and the staple/fold motor normal? NO Correct the wiring. YES Try to rotate the staple jam releasing dial. Is there mechanical trapping? YES Fix the mechanism. NO Try replacing the staple/fold motor (M7). Is the problem corrected? YES End. NO Replace the finisher controller PC board. [Procedure 2] Is the staple/fold motor clock sensor (PI14) working properly? NO Replace the sensor. YES Does the staple/fold motor operate at the appropriate timing? YES Replace the finisher controller PC board. NO Is the stapler unit drive mechanism working properly? NO Fix the mechanism. YES Try replacing the staple/fold motor (M7). Is the problem corrected? YES End. NO Replace the finisher controller PC board. [Procedure 3] Is the folding home position sensor (PI11) working properly? NO Replace the sensor. YES Is the wiring between the finisher controller PC board and the staple/fold motor normal? NO Correct the wiring. YES Try to rotate the fold jam releasing dial. Is there mechanical trapping? YES Fix the mechanism. NO Try replacing the staple/fold motor (M7). Is the problem corrected? YES End. NO Replace the finisher controller PC board. [Procedure 4] Is the staple/fold motor clock sensor (PI14) working properly? NO Replace the sensor. YES Does the staple/fold motor operate at the appropriate timing? YES Replace the finisher controller PC board. NO Is the saddle stitch unit drive mechanism working properly? NO Fix the mechanism. YES Try replacing the staple/fold motor (M7). Is the problem corrected? YES End. NO Replace the finisher controller PC board.