You did not do it right first you run drum dry, then clear the counter then install the new drum and developer, now get new developer and drum and follow the service manual drum dry first then clear counters then run TCR adj. then run gradation procedure Better to get a tech to do it.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
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