Troubleshooting 
10-6
Irregular horizontal 
lines appear in the 
image.
— Run [MC] and decrease the 
adjustment value. Decrease the 
adjustment value 1 level at a time 
from the current value. If there is 
no improvement after the value is 
decreased by 1 level, decrease by 
1 level again. If there is still no 
improvement, return the setting to 
the original value.
8-138
The altitude is 1500 m 
or higher and irregular 
horizontal white lines 
appear in the image.
— Run [Altitude Adj.] and set the 
adjustment value to [High 1]. If 
there is no improvement when the 
value is set to [High 1], set to [High 
2].
8-137
The altitude is 1500 m 
or higher and dots 
appear in the image.
— Run [Altitude Adj.] and set the 
adjustment value to [High 1]. If 
there is no improvement when the 
value is set to [High 1], set to [High 
2].
8-137
Part of the image is 
periodically faint or 
shows white lines.
— Open and then close the rear 
cover.
—
— Run [Drum Refresh].
8-136
The background 
density is obtrusive.
— Carry out Background Density.
4-23
Colors appear 
different than you 
anticipated.
Did you choose appropriate 
image quality for the original?
Select appropriate image quality.
3-10
5-15
Have you loaded color copy 
paper into the paper tray?
Load color copy paper into the 
paper tray.
2-47
— Run [Color Calibration].
8-126
Symptom Checkpoints Corrective Actions
Reference 
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