Konica Minolta c5501 Error code 2421, 2424

[gamand]

I have a 5501 with 2421 and 2424 error code.
I replace developer.
I replace TCR sensor/charging corona from magenta.
Values of the sensors in service mode 54-00, 54-09 is 0 for yellow and 6 for black.
help me pls

[swaggen]

I have a 5501 with 2421 and 2424 error code.
I replace developer.
I replace TCR sensor/charging corona from magenta.
Values of the sensors in service mode 54-00, 54-09 is 0 for yellow and 6 for black.
help me pls

I am having the same problem. What was the result?