Chapter 1515-315.2.4 16-Gradation (TYPE=4) 0014-3135Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080i / iR C2550Use this test print to check gradation, fogging, white line, and uneven density at the front/rear.- GradationIf the 16-gradation[1] is not properly produced, suspect a fault in the drum unit or the laser exposure system.- FoggingIf fogging is found only in the white area[2], suspect a fault in the drum unit or the laser exposure system.- White LineIf a white line is found in the image, suspect a fault in the developing system.- Uneven Density at the Front/RearIf uneven density is found at the front/rear, suspect a fault in the drum unit, laser exposure system, or transfer system.F-15-115.2.5 Full Page Halftone (TYPE=5) 0014-3136Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080i / iR C2550Use this test print to check a transfer fault, black line, white line, and uneven density at specific intervals.MEMO:- You can print out test prints for individual colors by making the following selections in service mode: COPIER>TEST>PG and then COLOR-Y/M/C/K.- You can also change the density of the test prints by making the following selections in service mode: TEST>PG>DENS>Y/M/C/K.(1) Transfer FaultIf a transfer fault (white spot) occurs, suspect a fault in the ITB unit or the secondary transfer outside roller.(2) Black LineIf a black line occurs, suspect a scratch in the photosensitive drum or dirt on the primary charging roller.(3) White LineIf a white line occurs, suspect a fault in the ITB unit, secondary transfer outside roller, or laser exposure system.(4) Uneven DensityIf the density is uneven at specific intervals, suspect the following:(a) photosensitive drum (if at 94.2 mm)(b) developing cylinder (if at 28mm)(C) Charging roller(if at 42.7 mm)(5) Uneven DensityIf uneven density occurs, suspect dirt on the dust-blocking glass of the laser unit or deterioration of the ITB.[1][2]
