KM C6000 Magenta and Black mis-registration problem

[Ismael]

Hi guys, I´m absolutely out of my mind with a KM C6000, i had performed all the adjustments (Restart Timing, CD Mag, FD Mag, Gamma, auto color registration adj., etc.)I had cleaned sensors just outside, not inside, tight the spring on transfer belt coupler, drums replaced by "Mitsubishi". But nothing solve the problem. Doing prints in paper of 170gm. and 300 gm. Magenta and black appears out of registration. This problem is more evident at the end of the print.
Please any suggestions?

Thank you

[montadakoms]

follow this step:

1- go to service mode and then touch state confirmation I/O check 35-21 then start
now FIN is appear go to step 2

2- go to service mode and then touch machine adjust the printer adjust then writing position memory skew adjust then start

regards