iR8500 quality problem - developer unit?

[Juxta5]

We are getting streaks running vertically on an 11" x 17" sheet when printing a 20% grey test.

The lines are very random (ruling out the drum?) and some are darker while others are lighter. What can be cleaned, or checked?

[mrfixit51]

Greetings to near-Coors country!

We are getting streaks running vertically on an 11" x 17" sheet when printing a 20% grey test.

The lines are very random (ruling out the drum?) and some are darker while others are lighter. What can be cleaned, or checked?

The Drum could be polished to eliminate the tracks where the developer gap rollers run on it. When this gets dirty, you can get a kind of washboard effect from the rumble of the rollers riding on the deposits. Wear on the mag roller can usually be spotted by repeating pattern, most easily seen on 11x17. So I would start with the drum polish and see what that gets you!

[Guest]

I would check the developer unit, clean it, check the gears as well.

[OJ the Bodge]

I would start with the basics, whats been done before, make sure the coronas are wired with Tunsten not gold wire, then move onto the dev unit see if the toner is genuine canon, pirate stuff can cause similar problems, then wear and tear on dev roller

[20YRSEXP]

Dev unit and drum polish are both good suggestions. May just need a good full PM. I was wondering how many copies you have on the machine?

[Canuck]

Are the bands running front to rear? If so like said clean the flanges on the drum...the developer is bouncing. If they keep getting dirty replace the drum cleaner seals...i replace them every 1 million copies. IR105 is even worse...it has extra fan that blows waste toner and contaminates the seals

[Juxta5]

It has only 650,000 clicks and the sample pic I attached shows the paper running landscape (paper feeds via the short side). The corona wires have been replaced recently, someone mentioned tungsten... these are the stainless steel.

I am going to check the drum and developer as suggested above.

[20YRSEXP]

650K? is it a rebuild? The wires should be tungsten, the Grid should be stainless. make sure no one put grid wire on the posts. It could cause issues.

[waynec]

The corona's on that particular model should be re-wired every 200 000 copies plus polishing the drum and making sure there is no toner build up on the edge of the drum.

[blackcat4866]

20YRS is correct. The stainless wires were a fix back from the early 1990's and didn't make much of an improvement on the NP-6650s. You should have the brown gold wires with blue wire cleaners.
Really, I see two problems here. In addition to the wires you've got a drum cleaning problem, possibly polishing in addition. The clue is the fact that the streaks run off into the void areas of the copy. A developing problem would not do that. =^..^=

[mtech]

Wires-wires-wires. Even if they were replaced yesterday. Clean the filters. Also make sure the machine is not in toner save!!!