Bizhub 751 dropping developer

**MVPunisher** · 10-30-2014

So I have a bizhub 751 that is dumping developer. Note - developer not toner/developer mix. I am aware that all of these dump the mix at some point during their PM cycle.

Have replaced just about everything you would imagine. Swapped a drum carriage from another machine. Full PM. Transfer Sep. Drum.

Yesterday I did the HVPS and PRCB together along with a fresh developer. Call back this morning same thing. Going to bring another drum up and do the drum/wires/grid/toner collect roller now that there is a new HV unit in there.

Stumped.

**CompyTech** · 10-30-2014

When you did the Trans. Sep., did you just do the wires or the whole unit? I've had faulty units mess up drums and dv before.

**MVPunisher** · 10-30-2014

Yes I did. I've dealt with the overtoning spew problems more times than I would like to.

Never have I had the developer itself get pulled on this model. Front if Dev unit looks clean. It isn't overtoned.

While there today I will swap ts unit with other machine just in case.

**MVPunisher** · 10-30-2014

The t/s unit is what I'm referring to that I will sawp.

**copier addict** · 10-30-2014

On these pieces of crap the charge grid, if it is dirty or worn out, will pull dev and drop it on the entrance to the fuser and wear out the upper fuser roller. Clean or replace the charge grid.
Hope this helps.

**MVPunisher** · 10-30-2014

I have a grid with me. Doing drum,grid, wires and toner collect roller today. All items I have already done. Hoping maybe with the new HV and prcb they will react better.

Thanks guys.

**pappyvonsillypants** · 10-30-2015

So what was the final outcome? is it fixed, and if so what was the fix??

**MVPunisher** · 10-30-2015

I ended up replacing the entire drum carriage with the dev unit and it never came back. What a nightmare,

Yours is dumping developer correct? I am not referring to the unfortunately "normal" overtone and toner spew. That's normal on this model lol.