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Home / Articles posted by Md Ashraful Islam (Page 36)
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Call for Service CE40

  • Code: CE40
  • Description:Image quality control test pattern abnormality: The test pattern is not formed normally.
  • Causes:Main charger cleaner Drum cleaner unit LED printer head Image quality sensor (Rear) Transfer belt Spring 1st transfer contact/release clutch 1st transfer roller status detection sensor Image quality sensor LGC board High-voltage transformer (HVT)
  • Remedy:1 Check if there is any abnormality on the hand grips and rods of the main charger cleaner. Correct if there is. 2 Check if the drum is rotated properly by turning the coupling of the cleaner unit. Correct the auger and the surrounding hardware if not. 3 LED printer head • Check the connectors and harnesses between the LGC board (CN357, CN359, CN356, CN358, CN331, CN332, CN329, CN330, CN788, CN787, CN790, CN789, CN792, CN791, CN794 and CN793) and the LED printer head. • Check if there is any stain or scratch on the LED printer head. Clean or correct if there is. 4 Check if there is any stain on the image quality sensor (Rear). 5 Check if the sensor shutter is working properly. 6 Transfer belt Check if the transfer belt is installed in the transfer belt unit properly. Check if the transfer belt is loose or heaving, and correct it if needed. Check if the transfer belt unit is installed in the equipment properly. Check if the transfer belt is properly operated. (ON: FS-03-101 / OFF: FS- 03-151) If the transfer belt rotates normally, check if any abnormal stains (cleaning defects), large scratches or breaking are on the surface of transfer belt by making full rotation of transfer belt. Replace the transfer belt if any. If the transfer belt is not rotating normally, check if the drive gears are damaged or if it contacts the equipment or if the transfer belt cleaning unit is normal. Correct it if needed. 17* 7 Check if any of the springs for supplying power to the transfer belt unit is deformed. Replace the spring if it is deformed. 8 Use “Image quality control abnormal detection counter Y to K display/0 clearing (FS-08-2528 to 2531)” to check the abnormal occurring condition for each color. 9 Check the first pattern detection value for each color of image quality sensor detection value (FS- 05-2758-2 to 5), and identify the color of unit which causing test pattern abnormality. Identify the color of unit by check the value which exceeds “600”. (Sub-code 2: Y, 3: M, 4: C, 5: K) If the detected value of K is normal but that for only Y, those for Y and M, or those for Y, M and C is abnormal, perform the following procedure. -> Check that the phenomenon can be recovered by replacing the 1st transfer contact/release clutch or the 1st transfer roller status detection sensor. 10 Check if the developer unit identified in step 9 has been installed properly. Visually check the installation and assembly status of the developer unit, and correct it if there is any abnormality. 17* 11 Set the values of “Image quality closed-loop control / Contrast voltage (FS-08-2486)” to “0” (Invalid). 12 Perform “Enforced performing of image quality open-loop control (FS-05-2740)”. 13 Output several number of sheets of the image quality control test pattern (FS-04-270) and the list print (FS-30-101), and check the pattern of the color identified in step 9. Is the image normal? Yes 15 No 14 14 Abnormal image Correct the abnormal image. Blank print, Solid print, White banding, Color banding, White spots, Poor transfer, Uneven image density, Faded image (low density), Uneven light distribution, Blotched image. Notes: • Refer to the each troubleshooting for the image. • Blank print: including when one of the YMCK colors is not printed. 16 15 Replace the image quality sensor or LGC board. 16 Set the values of “Image quality closed-loop control / Contrast voltage (FS-08-2486)” to “1” (Valid). 17 Perform “Forced performing of image quality closed-loop control (FS-05-2742).” Is it completed normally? Yes 19 No 18 18 Check and correct it accordingly. 19 Perform “Automatic gamma adjustment”. 20 Clear all “Image quality control abnormal detection counter Y to K display/0 clearing (FS-08-2528 to 2531)”.
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