Chapter 3 Troubleshooting
3-42
Phenomenon: 1 to few lines of horizontal line looking digital
3.4.5 Horizontal Streak All Over the Image
Phenomenon: Horizontal streak in 7 line cycle
Phenomenon: Irregular horizontal streaks all over the left side of the image
Phenomenon: White streaks starting in the midway going all the way to the right edge of
the image
Phenomenon: Horizontal streak in 6 ~ 7 mm cycle
No.
Cause
Response
1
Connection failure
Confirm the connection of the LMC connectors (CN8,
J1, CN301, CN302, CN303, and CN304).
2
H-sync signal detection problem.
Confirm the H-sync signal using the oscilloscope and
replace the optical unit if there is a fault.
•
"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.
3
When there is any other digitalization
(include density change)
Confirm after replacing LMC or CIU.
•
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
Polygon correction
Redo the unevenness calibration.
2
There is a possibility that vignetting is
occurring to the laser ray in 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.
No.
Cause
Response
1
Fluctuation of laser intensity
Replace the optical unit.
See
"5.2.5 Removing/Installing the Optical Unit (Page
for the procedure to replace the optical unit.
No.
Cause
Response
1
Fluctuation of laser intensity
Replace the optical unit.
See
"5.2.5 Removing/Installing the Optical Unit (Page
for the procedure to replace the optical unit.
No.
Cause
Response
1
Problem in subscan action due to the
rust on the LM guide
Lubricate the LM guide.
See
"7.2.7 Greasing LM Guide (Page 7-11)"
for the
procedure to lubricate the LM guide.
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