Clean the sensor surface with a cotton swab or a soft cloth. Slide the sensor shutter so that the sensor surface can be seen.Check the connector and the harness between the sensor shutter solenoid and the LGC board.(Opening: 03-125 / Closing: 03- 175) If the sensor shutter is not opening or closing, check if it is damaged or there is any abnormality in the sensor shutter solenoid. Check if the sensor shutter is opening or closing normally.Is the sensor surface of the image quality sensor clean? Yes 8 No 6 6 Sensor unit Take off the transfer belt unit so that you can see the sensor unit.Is the sensor shutter of the image quality sensor opening or closing normally? Or is it normal without any damage?.(ON: 03-101 / OFF: 03-151) If they are not rotating normally, check if their drive gears are damaged or if they contact the equipment. 4 4 Drum and transfer belt Check if the drum and the transfer belt are properly operated. If there is any abnormality, correct it, and clean the transfer belt. If any, check the installation status of the TBU cleaner unit. 3 3 Transfer belt Check if any toner image remains on the transfer belt surface. Are the drum and the transfer belt rotating? Yes 5 No 2 2 Transfer belt unit Check if the transfer belt unit is securely installed.Are there any abnormal stains (cleaning defects), large scratches or breaking on the transfer belt surface?.Is the transfer belt or the transfer belt unit securely installed?.Description: Image quality sensor abnormality (no pattern level): The output value of this sensor is out of a specified range when the image quality control test pattern is not formed.Check if the +12V voltage is normally output by the CN345- 7pin on the LGC board.Check the harnesses between the LGC board and the switching power supply.
Check the harnesses between the LGC board and the image quality sensor.Remedy: Image quality sensor Connector check LGC board.Causes: Switching power supply Image quality sensor LGC board.Description: Image quality sensor abnormality (OFF level): The output value of this sensor is out of a specified range when sensor light source is OFF.
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