Oce 3121 Technical & Service Manual page 866

L-TEST2: Halftone test print
2
Use it to check for transfer faults, black lines, white lines or uneven intervals.
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If transfer faults are noted (vertical white spots), suspect dirt on the transfer
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charging roller or the separation static eliminator.
If black lines are noted, suspect scratches on the drum or dirt on the primary
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charging roller.
L-TEST3: blank test print
3
Use it to check for fogging.
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If fogging is noted, suspect a fault in the photosensitive drum, developing
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system or laser system.
54 TSM Océ 3121 SDS Description