23 SC28-31 to 34 (Charging potential correction (Vm)
error)
[Symptom]
Under low humidity environment, SC28-31 to 34 occurs after displaying "Adjusting" on the
operation panel or performing auto gamma adjustment manually.
[Probable cause]
If performing auto gamma adjustment under low humidity (humidity inside machine is around
10%), due to the photoconductor drum humidity characteristic, LD Power becomes saturated.
[Solution]
From the following setting menu, adjust the exposure amount for the problem color.
Utility/Counter => [03 Machine Admin. Setting] => [01 System Setting]] => [05 Expert
Adjustment] => [06 Process Adjustment] => [03 Toner Quantity/Exposure] (Decrease exposure
amount)
When changing the above setting, return to the normal screen. (Automatically gamma
adjustment is performed.) If the problem persists, replace the problem color drum since the
cause of the SC is the combination of drum characteristic and humidity.
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