2L6/2N6/2N5/2N4
1-4-260
(3) Image is too light.
Print example Cause of trouble
1. Variance in environments (dew formation).
2. Toner is under supplied, or deteriorated in quality.(Under charged)
3. The volatage of the developing bias is too low.
4. The volatage of the primary transfer current is too low.
5. The power of LSU laser is too low.
6. The surface potential of the drum is too high.
Defective part Check description Corrective Action
1
Drum unit Check that the drum has dew
condensation.
If a dew condensation is observed, porform
drum refreshing.
(System Menu >Adjustment / Maintenance)
2
Developer unit Executing U089 to generate
four-color PGs and check the
following with the color which is
defective:
(see page 1-3-70)
Check the value of U155.
(see page 1-3-107)
If the value is less than 542, perform U132 to
forcibly replenish toner.
(see page 1-3-96)
Replace the developer unit if the output is kept
too low.
Check if the device executed a
low-density printing for a pro-
longed period.
1. If the device was executing a low-density
printing for a prolonged period, perform
developing refreshing.
(System Menu >Adjustment /
Maintenance)
2. If developer refreshing does not correct the
problem, perform the following
Execute maintenance modes U464
Calibration and U410 Grayscale
Adjustment.
(see page 1-3-197,1-3-172)
Check if the connecting termi-
nals for developer bias are
deformed.
If the connecting terminals are deformed,
correct for a proper conduction.
Check the value of U140
MagDC.
(see page 1-3-99)
If the MagDC value is in excess of the upper
limit by U140, perform U464 to set the
Thickness Target Value from 0 to +30.
Execute maintenance modes U464
Calibration.(see page 1-3-197)
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