C500,Grad and Bias of Dev very low

[Guest]

Hi,

I have a HP9850MFP(same as C500 or 8050). with poor Cyan Density, and check the process Value with poor Grad and Bais of Dev, both of them are all equle to 200V

I have try to changed the developer, developer unit ,gamma senser and gamma senser board, drum unit , charging unit, 100Kpm and 200kpm,even rewrite the firmware, I think I have already done all that I can , but it is not any Improve.

when I restore the process adj value, the Cyan well be deep enough, but only do once autogamme , the grad value is fall down and color go light.

have any Recommendation? thanks

[mrwho]

[neon]

Thank you for so quickly reply, I well try it!