bad Magenta fill on BP-70C55

[driving lots of miles]

I am getting a bad Magenta fill on BP-70C55. All the other colors are solid fill. There are 18,000 black copies and 55,000 color copies. Machine is almost a year old. I have cleaned contacts on all the drums and developers. I have replaced the magenta drum unit with a brand new complete unit. All optics have been cleaned. When I try to do auto registration I end up with ERROR: DATA_SUB_K_F_2nd 11. I have tried to do the registration thru system settings and thru Sim 50-22. We are using genuine sharp toners. Any ideas would be helpful. Thanks

[harps05]

Had this the other week. I had to add a new dev to it. Not sure why though.

[driving lots of miles]

Thanks, that was the next thought I was tossing around but wanted some input as it is way early for developer.

[driving lots of miles]

The solution was to replace the magenta developer.
Thank You harps05

[harps05]

it is way early for developer.

I had to do the Magenta also. I changed the drum unit at the same time, to be sure. Yesterday, same machine, same problem this time Yellow dev.?.?

[leo34staffs]

There was a bulletin relating to developer pull (not sure if this your issue) and to check the blank lamps were in the correct position, this would cause lack of drum quenching and result in low dev quantity.

[Chr15tophe]

There was a bulletin relating to developer pull (not sure if this your issue) and to check the blank lamps were in the correct position, this would cause lack of drum quenching and result in low dev quantity.

Do you have that Bulletin ref ? thanks

[Chr15tophe]

Do you have that Bulletin ref ? thanks

Theres modified dev units for these machines..

[odinp]

I have fixed this issue by running 25-02

[OlliK1969]

I have fixed this issue by running 25-02

Hi
When the developer is out of the unit, he's gone. With 25-02 you fill up with toner for a short time and mix everything well, but the error will come back in the short term.