Ricoh IM C6500 toner density issues

[tibbs]

Hello i have a customer with a IM C6500 that is putting an excessive amount of yellow toner into the drum cleaning unit. Also there is a yellow line appearing on the images. We have replaced the developer, charge roller, drum, drum cleaning blade, apply blade and the oil roller but the line is still there plus excessive tone. Yellow density reading is 8.5 percent the other colors are much lower. Can anyone share any info on this problem.
Thanks.

[slimslob]

The first thing to try is cleaning the image density sensor assembly.

[tibbs]

Ok i will try this to sww if there is any change. thanks