3 Is the drum old/new detection switch of the drum cleaner unit normal? Yes 4 No Replace the drum old/new detection switch. Yes 4 No 2 2 Check if the harness of the drum old/new detection switch in the drum cleaner unit is open circuited. Remedy: 1 Check if the old/new detection bar of the drum cleaner unit is being ejected.Causes: Drum old/new detection switches Drum TBU motor LGC board.Description: Drum/cleaner/charger unit replacement (old- new) detection abnormality.12 Is the LGC board normal? Replace the LGC board. 11 Is the harness of the LGC board normal? Yes 12 No Replace the harness. No 10 10 Check that the connector of the LGC board (CN310) is connected properly. Yes Correct the engagement of the couplings in the drum TBU drive unit and the developer unit. 9 Check that the coupling of the drum TBU drive unit is driven properly. Yes 9 No Replace the paper feeding/developer unit drive motor. Yes 9 No 8 8 Check if the harness of the paper feeding/developer unit drive motor is open circuited. (Input check: 03-112) Yes 9 No 7 7 Check that the connector of the paper feeding/developer unit drive motor is connected properly. 9 No 6 6 Check that the paper feeding/ developer unit drive motor rotates properly. Yes Correct the engagement of the couplings in the paper feed developer drive unit and the developer unit. 5 Check that the coupling of the paper feed developer drive unit is driven properly. (Is the driving in the old/new detection pusher section transmitted?) Yes 3 No Correct the old/new detection pusher so that it is moved to the escape position. 4 Check if the old/new detection pusher is moved to the escape position while the coupling of the developer unit is rotated by hand.
3 Is the old/new detection switch of the developer unit normal? Yes 4 No Replace the old/new detection switch. Yes 4 No 2 2 Check if the harness of the old/ new detection switch in the developer unit is open circuited. Remedy: 1 Check if the old/new detection bar of the developer unit is being ejected.
Causes: Developer unit old/new detection switches Paper feeding/developer unit drive motor LGC board.Description: Developer unit replacement (old-new)detection abnormality.Description: Auto-toner sensor-Y abnormality (lower limit).Description: Auto-toner sensor-Y abnormality (upper limit).Check if the developer material is too light visually.Description: Auto-toner sensor-M abnormality (lower limit).Check if there is any foreign matter such as toner in the connector of the auto toner sensor.Check the connectors and harnesses between the auto toner sensor and LGC board (CN364).Remove any toner or dust on the EPU sensor connector and the drawer connector on the equipment side.Remove any toner or dust on the ATC sensor connector and the drawer connector of the process cover.Check if the amount of the developer material is too large or too small.Check if the developer material is too dark visually.Check that the mixer of the developer unit is rotated.Check that the developer unit and coupling on the equipment side are properly engaged.
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