There are countless threads about the issue of good copies and light prints as the PCU approaches end of life on machines from way bask to AF1022/27 thru the xx53 series
SP2907-001 thru 005 is the SP mode that you're looking for, that will improve the copy quality as the PCU gets close to end of life. The default is 5. Setting them to 7 or 8 usually does the trick for me.
Question: When the copy quality faded, why would you only replace the drum, and not the Dev? It takes 5 minutes more, and Dev has been the primary causes of light copies since the beginning of time
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