• Code: C9070
• Description: DP - SHD communication error Object: Dual scan DP
• Causes: The communication error between the DP main PWB and the DPSHD PWB was detected during communication.
• Remedy: 1 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• DPSHD PWB - DP main PWB Electrical Diagram of PWBs 2 Replacing the DPSHD PWB The DPSHD PWB is faulty. Replace the DPSHD PWB. 3 Replacing the DP main PWB The DP main PWB is faulty. Replace the DP main PWB. DP Main PWB Replacement

• Code: C9080
• Description: LED failure detection Object: Dual scan DP
• Causes: After 4 blocks of the LED lamps of the DPCIS are lit when turning on the power, the acquired peak value of some blocks is the reference value or less.
• Remedy: 1 Checking the LED lamp The LED lamp of the DPCIS does not light. Execute U203 to confirm that the LED lamp of the DPCIS does not light. Go to the next step. U203 Execution 2 Checking the DPSHD PWB The DPSHD PWB is not properly connected. Reconnect the DPSHD PWB to the DPCIS. 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• DPSHD PWB - DP main PWB Electrical Diagram of PWBs 4 Executing U411 DP scanning is not properly adjusted. Execute U411 [DP FD(ChartB)] and [DP FD(ChartA)]. U411 Execution 5 Replacing the DPCIS The DPCIS is faulty. Replace the DPCIS, and then execute U091 and U411. DP CIS Replacement 6 Replacing the DPSHD PWB The DPSHD PWB is faulty. Replace the DPSHD PWB.

• Code: C9180
• Description: DP reverse motor error Object: Automatic duplex DP with the DP feed belt
• Causes: The home position cannot be detected even if executing the retry of the home position detection 3 times continuously. [Note]Home position detection: When shifting the DP reverse motor to the home position, the retry will be executed if the home position could not be detected after driving the DP reverse motor 1-round.
• Remedy: 1 Resetting the main power The DP reverse motor is not controlled properly. Turn the power switch and the main power switch off . After 5s passes, turn the main power switch and the power switch on. 2 Checking the DP reverse motor The DP reverse motor does not rotate properly or the excessive load is applied to it. Remove the DP reverse motor and fix it by rotating the drive components manually. Then, reattach it. 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wires if there is no continuity.• DF reverse motor - DP main PWB• DP timing sensor - DP main PWB Electrical Diagram of PWBs 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 5 Checking the DP reverse motor The DP reverse motor is faulty. Reconnect the DP reverse motor. Replace it if it is not fixed. 6 Checking the DP timing sensor The DP timing sensor is not properly attached, or it is faulty. Reattach the DP timing sensor. Replace it if it is not fixed. 7 Checking the DP main PWB The connectors on the DP main PWB are not properly connected, or the wires are faulty. Reconnect the connectors on the DP main PWB. Then, fix or replace them if they are pinched by the other part or if they have any damage. When the issue is not resolved, replace the DP main PWB. DP Main PWB Replacement

• Code: C9500
• Description: Image processing PWB error (Scanner)
• Causes: Scanner
• Remedy: 1 Checking the FFC The FFC is not properly connected, or it is faulty. Reconnect the following FFC. When the FFC terminals are peeled off or deformed or the FFC is broken, replace the FFC.• Engine PWB - Main PWB Electrical Diagram of PWBs 2 Replacing the main PWB The main PWB is faulty. Replace the main PWB. Main PWB Replacement 3 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C9510
• Description: Image processing circuit error (DP)
• Causes: DP
• Remedy: 1 Checking the DP relay PWB The DP relay PWB is not properly attached. Reattach the DP relay PWB. 2 Checking the SATA cable The SATA cable is not properly connected, or it is faulty. Reinsert the connectors of the SATA cable between the DPSHD PWB and the DP relay PWB. If the issue is not resolved, check the continuity, and replace the SATA cable if there is no continuity. Electrical Diagram of PWBs 3 Replacing the DPSHD PWB The DPSHD PWB is faulty. Replace the DPSHD PWB. 4 Replacing the DP relay PWB The DP relay PWB is faulty. Replace the DP relay PWB. 5 Replacing the main PWB The main PWB is faulty. Replace the main PWB. Main PWB Replacement

• Code: C9540
• Description: Backup data error
• Causes: When multiple parts are replaced at the same time, the internal data is changed and it interferes with the machine operation. Consequently, the main unit cannot recover.
• Remedy: 1 Checking the PWB Multiple PWBs were replaced at the same time. Recover to the original, if 2 or more of the following related parts were replaced at the same time.• Related parts: Memory, each PWB 2 Checking the unit Multiple units were replaced at the same time. Be sure not to perform the following works at the same time when the memory or each PWB is replaced.• Replacing the drum unit or the developer unit• Relocating the drum units to other colorspositioninsideamainunit'

• Code: F000
• Description: CF000 will be displayed if * notes progress is carried out for a definite period of time with a Welcome screen.The communication fault between Panel-Main boardsCommunication fault between Panel Core-Main Core Notes 2
• Causes:
• Remedy: (1) Check the harness of * (between Main board <=>HDD), and the connection state of a connector between Panel<=>Main boards, and perform an operation check. (2) Check contact of a DDR memory (extracting) and perform an operation check. If exchangeable, it will exchange and will perform an operation check. (3) Initialize HDD and perform an operation check. (FULL of U024) * ( 4) U021 Controller backup initialization is carried out and an operation check is performed. (5) Exchange a Main board and perform an operation check. (6) Exchange a PanelMain board and perform an operation check. (7) It will get, if USBLOG is obtainable, and contact service headquarters. * : only HDD standard model * Note 2 : Only Dual Core CPU model

• Code: F12X
• Description: Abnormality detecting in a Scan control section
• Causes:
• Remedy: (1) Check the harness between Scan/DP<=>Main boards, and the connection state of a connector, and perform an operation check. (2) Initialize HDD and perform an operation check. (FULL of U024) * ( 3) U021 Controller backup initialization is carried out and an operation check is performed. (4) Exchange a Scan/DP board and perform an operation check. (5) Exchange a Main board and perform an operation check. (6) Get USBLOG and contact service headquarters. * Only HDD standard model