Thanks: 
Likes: ive seen the coronas vibrate causing drum contact, you normally will see a kind of grid pattern but try swapping coronas around, see if the issue changes.
Dislikes: 0
ive seen the coronas vibrate causing drum contact, you normally will see a kind of grid pattern but try swapping coronas around, see if the issue changes.
We know a thing or two because we've seen a thing or two.
Also don't ask me for files without a contributor badge.
Similarly I was going to suggest swapping cyan and black drums. I'm still stuck on drum cleaning. =^..^=
If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=
Morning all...
Thanks again for your replies, most appreciated.
tsbservice: The mark remains irrespective of the job sent through, CMY separations, no image anything. So yes so I agree, it's unlikely to be TB related.
Synthohol: Ideed, this is where I started when the problem first occurred, replacing the drum and corona with new items. But I think you and blackcat have given me the next thing to try, I know the drums/coronas of the CMY are fine, so as suggested swap them over and see what happens. The vibration concept I'd not thought of, so if swapping doesn't change anything, which I suspect it won't, looking into whether something could causing an oscilation of the drum/corona is a great idea, and kinda makes logical sence as to the shape of the mark, and why it gets more pronounced as oscilations by nature amplify.
Thanks again
Mark
Sorted!...he says while grasping for some wood...just need to run a full job to make sure.
and the winner is....
Well not totally sure TBH.
I liked the suggestion of an oscilation causing the mark, so checked the drum shafts for any signs of play in the motor housing bearings, after all this is a high miler, but nothing of note. As suggested I swapped the cyan/black drum and corona's over, and ensured that they were snugly seated so that they couldn't oscilate. However...what I also noticed is that the TB assay didn't sit smoothly into it's support blocks when re-installing, you know how it usually just drops in, so cleaned them out put it all together, ran a load of test pattern sheets through and 200 sheets later no mark on any of them.
So, it could have been the drum/corona, or it could have been the TB oscillating on a bit of git in the groove, who knows.
What I do know is as usual you've come up trumps, so massive thanks for throwing ideas and suggestions at this, most grateful!
Until the next issue
Mark
Congratulations! Thanks for sharing. =^..^=
If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=
Re: c7000 - Ghostly mark repeats - not coding out
I would like to steal (well temporarily) from BC saying 'Congratulations on your success'!
Anyway I have no doubts from the beginning
Mark it is real pleasure for me to read your posts. Much appreciated we have people like you here.
A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
Blessed are they who can laugh at themselves, for they shall never cease to be amused.
I don't reply to private messages from end users.
Just a quick update on this for the record...
Guess what the marking came back again.
So, not knowing exactly which of the various things I had done actually appeared to fix it, I was kinda back to the start again.
Re-reading this thread I came back to what Synthohol had remarked about oscillation coronas.
As it turns out, it would appear to be this very thing. I noticed on the corona I had swapped before there was a very slight grazing of the shiny surface on the side that is towards the rear of the machine.
When you remove the coronas behind them at the front and back are two white sprung positioning/locating posts. Looking at all of them, it was clear some had been replaced in the past. And the rear one was looking rather off colour and tired. As the plastic housing was fine, I simply replaced the spring inside, and guess what, the mark was gone.
Funny thing is, I have not been able to locate the part in the parts manuals, can't find them anywhere, and I'm pretty familiar with the parts diagrams for this generation of machine.
Anyway run 50k sheets since and no marking...so here's to hoping I have cracked it this time.
So thanks again is in order!
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