KM 2030

[Kmdurrin]

We are working on a 5-6 year old KM 2030. Our customer is reporting a heavy gray background on the first print after warm up from sleep mode (1-2 inches on the leading edge). Subsequent copies are, however, fine.

We initially replaced the transfer roller, grid asm, cleaning blade, top/front drum cleaning section seal and thoroughly cleaned the cleaning section. When this only offered marginal improvement, we adjusted the automatic toner density settings. This also resulted in only marginal improvements. We then put in a new (rebuilt) HV board. This did not change the situation. We have not yet replaced the drum and dev yet, they have been in the machine for over a year now, but have less than 50k prints.

We've found that after the end of the copy cycle the drum is left with a fine, consistant layer of toner over the entire print surface.

Voltage readings during copy operations showed that the Grid Control Voltage (output) pin has a .56v charge at rest, which increases to 5v during the actual copy process.

Is it plausible that this low voltage is charging the drum when the machine is supposed to be at rest, and causing the heavy background on the initial print?

Any ideas on our next course of action? We're thinking about replacing the drum and dev or the whole PCU, though since copies after the first have few copy quality issues, we're not convinced this will really change the issue. At this point we're leaning more towards replacing the main board as the best course of action. Given the age of this machine though, that will be a more costly action than we're really comfortable with.

[Lotar]

I have seen this before and after replacing the drum and DV (and running DV set sim 130) the problem was gone.

[waynec]

Before you replace everything first rewire the corona and then run a U130 and ensure the reading gets to 100 before you hit the clear button.

[jasonimage]

ive hade to reach into the machine and form the little metal thing that the charge pushes into.