Sharp AR-157E Light Copies

[tcypy1961]

I have added toner and replaced the drum in this Sharp AR-157E and I am still getting light copies. Would this be a developer problem or is something else causing the problem? Any help appreciated, thank you.

[Silvertoast]

yup developer

[CCS]

dirty optic or mirror will cause light CQ as well, don't forget those...

[lky1978]

dont forget to clean the lsu, especially mirror of polygon motor