Ricoh 2075 Heavy background or Negative Copy

[scenicmike]

Hi to all!
I have the following problem. The machine is a Ricoh 2075.
Everything is clean and I've tried to change drum, developer module, charge corona, transfer assy, with no result.
Heavy background or Negative copy.jpgAny ideas?

[Phil B.]

Re: Ricoh 2075 Heavy background or Negative Copy

did you reset the bias for the new drum? reset dev bias?

have you tried starving the developer by doing sky shots and then re-tone the developer?

[slimslob]

Re: Ricoh 2075 Heavy background or Negative Copy

This used to be a problem with early plain paper machines. Not all manufactures used the same charge polarity on their toners. My guess is that you are not using Genuine Ricoh toner, developer and drum. Either that or the HV power pack is bad or connected incorrectly.

[slimslob]

Re: Ricoh 2075 Heavy background or Negative Copy

did you reset the bias for the new drum? reset dev bias?

have you tried starving the developer by doing sky shots and then re-tone the developer?

If it is a bias reversal problem, sky shot will come out blank. Checker flag is better for depleting toner.

[Phil B.]

Re: Ricoh 2075 Heavy background or Negative Copy

If it is a bias reversal problem, sky shot will come out blank. Checker flag is better for depleting toner.

wow learn something new everyday... never had "blank" skyshots

[KenB]

Re: Ricoh 2075 Heavy background or Negative Copy

This used to be a problem with early plain paper machines. Not all manufactures used the same charge polarity on their toners. My guess is that you are not using Genuine Ricoh toner, developer and drum. Either that or the HV power pack is bad or connected incorrectly.

I agree.

It's been many years, but I can remember several calls for this very problem that turned out to be bogus "competitive" toner.

[scenicmike]

Re: Ricoh 2075 Heavy background or Negative Copy

This used to be a problem with early plain paper machines. Not all manufacturers used the same charge polarity on their toners. My guess is that you are not using Genuine Ricoh toner, developer and drum. Either that or the HV power pack is bad or connected incorrectly.

All parts are genuine! Toner and developer. Only the drum is a Katun Performance. And after the problem, the machine is vacuumed and everything is clean.
I 'm in a dead end!

[scenicmike]

Re: Ricoh 2075 Heavy background or Negative Copy

If it is a bias reversal problem, sky shot will come out blank. Checker flag is better for depleting toner.

I don't know if anyone notices that there are no border deletions. And sky shot is completely black!

[slimslob]

Re: Ricoh 2075 Heavy background or Negative Copy

All parts are genuine! Toner and developer. Only the drum is a Katun Performance. And after the problem, the machine is vacuumed and everything is clean.
I 'm in a dead end!

Then your only other source the the Katun drum does not have the correct coating.

I don't know if anyone notices that there are no border deletions. And sky shot is completely black!

Anytime you have a background problem there are no borders, i.e. if other white areas have background, so will the borders.

[Lagonda]

Re: Ricoh 2075 Heavy background or Negative Copy

Check the bias contact and the drum earth. If it still has a problem put the old drum back in and see what happens.

[scenicmike]

Re: Ricoh 2075 Heavy background or Negative Copy

Check the bias contact and the drum earth. If it still has a problem put the old drum back in and see what happens.

I 'll check it and i will let you know!

[NeoMatrix]

Re: Ricoh 2075 Heavy background or Negative Copy

I'm incline to agreed with Lagonda....

Looks similar to when a staple is stuck to the dev roller/doc blade, or worn bearing/metal shards short out the developer unit bias.


HTH

[Phil B.]

Re: Ricoh 2075 Heavy background or Negative Copy

All parts are genuine! Toner and developer. Only the drum is a Katun Performance. And after the problem, the machine is vacuumed and everything is clean.
I 'm in a dead end!

get a real drum... katun drums are crap

[usta]

Re: Ricoh 2075 Heavy background or Negative Copy

Check the bias contact and the drum earth. If it still has a problem put the old drum back in and see what happens.

Check the cables from the adf unit to the back cards. We met. The problem was solved when we changed these cables.

[Codex]

Re: Ricoh 2075 Heavy background or Negative Copy

check the corona bias...had a similar problem and in my case it was the charge bias