Chapter 3 Troubleshooting
3-44
Phenomenon: Faint black steak
3.4.7 Quasi-Contour in the Image
3.4.8 Jitter (Jagged Vertical Line) in the Image
3.4.9 Image Size is Different (Vertically)
No.
Cause
Response
1
When there is no streak by reading
without any correction
Correction could of been made with a
dust on the CY2 mirror.
Redo the unevenness calibration.
2
White steak is at the same position by
reading without any correction
Could be a dust inside the optical unit.
Replace the optical unit.
See
"5.2.5 Removing/Installing the Optical Unit (Page
for the procedure to replace the optical unit.
3
There is a possibility of vignetting of the
laser or a ghost.
Phenomenon
Cause/Response
Only occur on the film output.
Confirm the imager.
Quasi-contour is visible even when image data
is confirmed on the service tool.
Bit fallout in the image data after LMC.
•
Replace the LMC.
See
"5.6.2 Replacing the LMC (Page 5-79)"
for
the procedure to replace the LMC.
•
Replace the CIU.
See
"5.10.1 Replacing the CIU (Page 5-115)"
for
the procedure to replace the CIU.
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
Rotation failure of the polygon if it is in 6
line cycle.
Replace the optical unit.
See
"5.2.5 Removing/Installing the Optical Unit (Page
for the procedure to replace the optical unit.
2
Synchronization to the H-sync signal is
not correct.
Confirm the input timing of the H-sync signal is not
changed, and the pulse wave is not blunt.
Replace the optical unit if you find any problem.
•
"3.2.19 Confirm the H-sync Signal (Page 3-
for the procedure to confirm the H-sync.
•
"5.2.5 Removing/Installing the Optical Unit
for the procedure to replace the
optical unit.
No.
Cause
Response
1
Pixel size of the printer (40 µm) is not
setup correctly.
Confirm the setup and correct.
2
Set the wrong printer type by mistake.
Confirm the setup and correct.
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