KM 6500 Error 2 when runing Color Registration Adjustment

[Mr Spock]

just for the sake of argument did you remove the red screws on the drum?

[printduthu]

just for the sake of argument did you remove the red screws on the drum?

Yes I did .

[Mr Spock]

it looks like either there is no black reference marks being produced or it can not see them.
Replacing the sensors would clear up the second option. I would check the transfer roller and make sure it is turning correctly. Check the drum and make sure that is correct. Try a half tone sheet of black and see if it looks correct. try recalling standard data and then doing reg adjustment.

[RickB]

try running the "Printer Gamma Adjustment" first (to get proper density), then the color registration. and just so you know, the colors all reference to black for registration which is why there isn't a skew adjust for black.