c-550 background problem urgent!!!

[gang1110]

i have customer with background problem specsaily in glossy paper 250gr or 300 gr the problem

shows sometimes. now the iu k+c+m+y new and the fuser is new the belt live somthing like 30%

attached file if someone have solution thank's.

[BIG PAPA]

If you stop the copy half way through is it on the copy? Can you see it on the belt?

[gang1110]

i dont think it's from the belt i can't see it i play with background voltage black on -5

[JSC]

Has the mod guide sheet ( A00H703400 ) been fitted next to the transfer roller? if not fit one. Try increaseing the second transfer voltage as a temp fix, to me it looks like a transfer problem, I'd also be tempted to replace the transfer roller as well.


Good luck

[fixthecopier]

Is it there if you do test prints from within the machines memeory? Like the printed meter or the gradation charts in test mode. If those are clean you could have issues with the OS.

[gang1110]

why do you think there is problem with transfer roller ? and increasing the transfer voltage how match?

[JSC]

Its not so much the transfer roller itself but the guide plate next to it. I've had a few of these machines give faults like the one you have and its been caused by static building up on the guide plate especially with thicker paper. If you just increase the second transfer voltage by lets say 2 or 3 steps you should see an improvment in the copy quality, if this is the case you know you are on the right track, the next step would be to fit the mod guide sheet or make one up your self and reset the transfer voltage back to the default setting.

[Shlomo.s]

Hello!
This model has a problem of development unit
Try to download the black background to 5-