Oce 3121 Technical & Service Manual page 867

17-gradation test print
4
Use it to check gradation and check for fogging, white lines and uneven
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(left/right) density.
If gradation is not good, suspect a fault in the laser system.
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If fogging is noted, suspect a fault in the photosensitive drum, developing as-
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sembly or laser system.
If white bands are noted, suspect a fault in the developing system or dirt on
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the transfer charging roller.
If white lines are noted, suspect a shading fault because of dirt on the stand-
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ard white plate.
If uneven density (left/right) is noted, suspect dirt on the primary charging
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roller or a fault in the developing system.
L-TEST5: grid test print
5
Use it to check straight line and angles.
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If a discrepancy is noted, suspect a displaced laser beam or a fault in beam
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detection.
ed.1 SDS Description 55