Question about Konica 7075 All-In-One Laser Printer

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Quality Issue Lately, the printer/copier has been leaving shaded streaks approx. 1/2" to 1.5" from the bottom of the page. The streaks are not wide up and down (only a little wider than a pencil mark), but the streaks vary in width going from side-to-side of the page, sometimes 1/4", sometimes 1/2" inch and sometimes 3 to 4" depending on how much time the copier has been running (it seems the more time, the worse the problem gets...) Unfortunately, the machine gets "serviced" and then 50 copies later (approx. 25-30 pages double sided per copy) it needs to be serviced again...This doesn't seem right. Any ideas?

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  • brian c
    brian c May 11, 2010

    Just to verify, this IS a Konica 7075, correct?


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When was the last time a PM kit was installed?

I am actually factory trained on that model, and what you're describing sounds like a bad charge grid (which comes in a PM kit). Any contamination on it will cause intermittent "hazing" and streaking, which seems to come from no where.

Also, there are a few "tricks" I remember on these. If the tech is familiar with these machines, i'm sure he knows them.

One crucial thing is that he performs the HV auto adjustments.

Don't forget to clean the write unit mirror that Konica conveniently hid up inside the machine above the drum carriage..

If you need more help, please don't hesitate to ask.

Posted on Feb 09, 2008

Thank you, Frosty, for the input...

The drum was brand new. The tech had said he had just replaced the wires...

Yesterday, (because he was called for the upteenth time), I watched him take the section out that holds the wires, drum, etc.
Turns out that the developer? housing had wiper blades on the lid that weren't snug...also, there was quite a bit of toner billowed out on the top of the developer housing...the tech all off a sudden mentioned that he had noticed something wasn't quite right the last time he was out (but of course, he didn't do anything about it). So far I'm not sure if the problem is truely fixed yet. I know that he had replaced the developer housing unit a couple services before that with a spare one off another "spare parts" machine...the whole point of doing this was to try to put off replacing developer (because it only had 300,000 on it instead of one million) because the quality was lousy. (some shading on the top and bottom of the paper and to the average Joe its not a big deal, but I have to give my customers a quality product. He showed me how to clean around the wires, etc. So if it happens again (which I'm doubting it will), I'll be able to do it myself. Frosty, your input helped me ask some specific, slightly more knowledgeable questions. Thanks.

Nitrotrike, yes, I was talking about a Konica 7075

Posted on Feb 09, 2008

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Hmm... there are three things that can cause this:

1) low, or old toner. obviously you'll get print issues if you have low toner, and old toner can get "clumpy" and not go on the page smoothly. Often shaking the toner cartridge can clear that up... just don't get toner all over yourself!!

3) dirty printer or wire. There is a thin taught wire that is inside the printer. Often they have a little felt brush attached which you can slide back and forth to wipe the wire and clean it. Occasionally laser printers need cleaning. Your printer's manual would have information about how to "clean" the printer.

3) bad printer drum. The drum is what statically charges the toner and paper so that they stick. If the drum has generated a small spot where it is always charged, it will always transfer toner, and always leave a "shadow" on the page. Seems to me that this would be the first thing they would check and fix if the printer gets "serviced" though.

My suggestion, is ask the people who serviced your printer exactly what it was that they did. If they just just open it up, blow out the dust, clean the printer, shake the toner, and put it back together, that won't help much if the drum is causing the problem ;)

Posted on Feb 04, 2008

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