MP C3500 Streaking mystery

[brad_jk]

I have seen this problem on an MP C4500. Found out our technicians are replacing PCU's but not developer. This problem had me sort of scratching my head, but after developer change on all units (in your case black) all our CQ problems went away and they haven't called in a month for this same issue. Don't know!!! Keepin' it simple.

The tech was going to do this but when I mentioned that this issue occurs when scanning to PDF he held off. He's going to send some of our flawed copies to their engineers and see what they come up with. Also when I mentioned that if you make 100 copies of a document it some times shows up on all copies exactly the same, implying it has something to do with the scanning process.

He checked the lamp harness and some other connections but it still did it right after.

We've been setting the flawed pages to the side and almost have a reem of paper worth of junk. This gets pretty annoying when you have a stapled copy job of 150 pages and there are a few of these streaked copies right in the middle.

[brad_jk]

Possibly a bent scanner frame? Has anyone been having a "water cooler" chat and leaned on it?

No the water cooler is on the opposite side of the office

The copier is just outside my office, I can see it through the window and have never seen anyone leaning on it. The ADF seems to be okay.

[Harry]

i agree with tonermunkeh check for bending scannerhausing and
lens cccd position

[Herrmann]

I think, if the scanner housing would be bent, the error would comre up continouesly, not per accident.
if you are sure, that it is no scanner lamp problem, i would suggest you to change the SDRAM-DIMM against known good ones, maybe there is some issue regarding writing and reading to memory

[Leif]

well if it had been permanently i would say dirt in the optics, but this looks like an image processing issue. i would clear memory in scanner and checked hdd for bad sectors..

[brad_jk]

A new lamp is on the way. The tech showed some examples of what's happeing to his collegues and they think it's a flickering bulb. It should be here in the next few days. We shall see!

[Leif]

well that's possible, but the scanner does a white level calibration (agc) (calibrating ccd element so every pixel has the same output voltage) it is calibrated for every time you use the scanner. So a flickering bulb should cause a sc 101,141 or 142..

[brad_jk]

A new xenon lamp was put in a week ago and we haven't had the problem since!

[Vulkor]

Keep us updated. An Odd fix if this works.

[blackcat4866]

It's relatively common on Sharp, Cougars specifically. =^..^=

[tcs04]

A new xenon lamp was put in a week ago and we haven't had the problem since!

Homer he say WOOHOO!! Thanks for the feedback and good luck!

[truong82]

I think this problem is scanner unit or laser unit. Pls check it

[teebee1234]

I think this problem is scanner unit or laser unit. Pls check it

Thanks for your input, but as the post above yours shows it has been resolved.