service code C-4661 on KM C1085

[BOTOY]

Hi every body,
We have service code c-4661 on our KM C1085. Machine is 1,8M count.
We change drum, corona, developer, transfer unit, clean machine, clean all sensor in the back of transfer, make all setting.

machine print some good paper sheet then print bad color registration sheet and service code 4661 appear.
On service mode, when we try to run auto color registration, we got error 2 message like on picture.

Any idea?
Thanks,

[BOTOY]

We have a second KM 1085 machine. We just exchange transfert assembly from one machine to other.
As the result, the two machines work normally :confused: