The copier does not add toner Y and M during copying. After Drum Units (Y,M) replacement, it began to work correctly .But after performing Gradation copier stopped adding toner again. In manual mode toner is added, but not enough (by about 25%) . We replaced Main Board , Motor&Hoppers toner ,but ineffectually . Toner is original , firmware new , counter about 6000. We will be grateful for any suggestions .
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