Konica Minolta 0902, Руководство по обслуживанию

Страница: 97 / 302

Chapter 3 Troubleshooting
3-43
Phenomenon: Horizontal streaks of 20 ~ 60 steps in 4 ~ 5 line cycle all over the image
3.4.6 Vertical Streak
Phenomenon: Sharp white streak (width of 5 ~ 10 pixels)
Phenomenon: Sharp black streak (width of 5 ~ 10 pixels)
Phenomenon: Faint white streak (width of 20 ~ 100 pixels)
No. Cause Response
1 Under effect of the radiofrequency
treatment equipment. Confirm if the horizontal streaks disappear by turning
OFF the radiofrequency treatment equipment or point
the antenna away from the equipment.
Increase the distance between the equipment and the
radiofrequency treatment equipment or point the
antenna of the radiofrequency treatment equipment
away from the equipment if the streaks disappear.
Important
Always perform the image size adjustment, the image position adjustment, the unevenness
calibration, and the sensitivity calibration after replacing the optical unit.
No. Cause Response
1 There is vertical scratch on the plate. Replace the plate.
2 Vignetting might be happening to the
laser by the dust stuck on the tip of the
condensing unit of the optical unit. Clean the light condenser of the optical unit using a
cleaning brush.
No. Cause Response
1 Unevenness calibration was performed
with a plate with scratch or dust on the
tip of the condensing unit in the optical
unit. Redo the unevenness calibration with a plate without
any scratch.
2 If there is a partial black steak with low
dosage image like shown below, and not
in the high dosage image, exciting light
leakage. Replace the optical unit.
See
"5.2.5 Removing/Installing the Optical Unit (Page
5-11)" for the procedure to replace the optical unit.
No. Cause Response
1 Could be a dust inside the optical unit. Replace the optical unit.
See
"5.2.5 Removing/Installing the Optical Unit (Page
5-11)" for the procedure to replace the optical unit.
2 Vignetting of the laser ray could be
happening if there are several streaks all
over the image.