[CQ] CS 2551ci grey background

[Copystar Tech]

I have a CS 2551ci with grey background on the front of internal prints that kind of looks like a dirty charge roller. The back side of a single sided print has grey streaking that resembles cleaning blade failure that stops abruptly after about three inches from the lead edge. I first suspected after market toner, but this is not the case.Re-flashed the machine with latest firmware. Tried a new developing unit, new toner cartridge and swapped drums between two other colors. All supplies have around 50,000 prints and were done in December. (except the Dev., which is now new) Appears all the grounding spring are clean and intact, with relatively no misting in black. (a bit in magenta) Fuser looks great, and even the secondary transfer roller was relatively clean. The problem diminishes on longer runs but never really totally clears up. Any ideas on this one? Anyone out there seen this bat-shit crazy behavior before? I've attached a sample.

[tee]

Re: CS 2551ci grey background

I've had to replace 2 primary belts that caused the back side background problem.

[Copystar Tech]

Re: CS 2551ci grey background

If it was a transfer belt issue, wouldn't the background be in all 4 colors for a color print? I've looped the sample I posted, obviously a color print, not even a hint of the other three toners in the mix.

[blackcat4866]

Re: CS 2551ci grey background

It looks like primary transfer cleaning to me too. Look at ColorPic:

primary transfer waste.JPG

=^..^=

[Santander]

Re: CS 2551ci grey background

If it was a transfer belt issue, wouldn't the background be in all 4 colors for a color print? I've looped the sample I posted, obviously a color print, not even a hint of the other three toners in the mix.

Not necessarily. Remember the primary transfer has a transfer roller for each color, so if one is not functioning properly you could get this result. The image on the back side is indicative of the transfer belt not being cleaned off and the previous image being transferred to the back side. I would definitely try another primary transfer.

[tmaged]

Re: CS 2551ci grey background

Look at QA F162.

[sparkycivic]

Re: CS 2551ci grey background

Yup, that QA describes testing and replacing the transfer pipe that takes waste from the transfer belt and brings it to the front of the machine. If you're finding that the transfer belt waste exit port(hole where it comes out) is plugged solid when you pull the belt and twist the little cover to expose it, or if that little twist cover is jammed, you need to address the pluggage/failure of the pipe. Cleaning-out or replacing the transfer belt will only work for a while until the waste builds-up again and starts leaving junk on the pages.

The pipe isn't fun at all to replace, but we have has a few 2550, 2551, fs-c8525 and such machines require it.

[The_Murph]

Re: CS 2551ci grey background

Yup, that QA describes testing and replacing the transfer pipe that takes waste from the transfer belt and brings it to the front of the machine. If you're finding that the transfer belt waste exit port(hole where it comes out) is plugged solid when you pull the belt and twist the little cover to expose it, or if that little twist cover is jammed, you need to address the pluggage/failure of the pipe. Cleaning-out or replacing the transfer belt will only work for a while until the waste builds-up again and starts leaving junk on the pages.

The pipe isn't fun at all to replace, but we have has a few 2550, 2551, fs-c8525 and such machines require it.

This is the root of all evil on these models. Keep in mind that that assembly also drives the waste auger across the front for all 4 drums as well. I've had several instances where the waste system in the drums breaks as well and they need replacement too. Beware hidden symptoms.

[Copystar Tech]

Re: CS 2551ci grey background

So, went back to the site today and, sure enough, the cleaning auger of the transfer belt was backed up and impacted with toner. Vacuumed out all excess from the transfer belt and all recycling ports. Can someone tell me where I can find QAs on KDAConnect? Search doesn't bring up anything useful.

[tmaged]

Re: CS 2551ci grey background

Go to Technical Resources>Service Portal. It's not real easy to navigate, but you should be able to find it with the QA number.

[JDR]

Re: CS 2551ci grey background

I had this several times and developer unit was shot.
The wierd thing is you already replaced it...

[Copystar Tech]

Re: CS 2551ci grey background

Thanks TMaged, found the QA. Rarely do I go to the portal because I hate windows explorer.

[JVergin]

Re: CS 2551ci grey background

Anymore if we have time we just replace these old style augers even if there's no sign of a CQ problem. prevents the inevitable future service call.

[The Hastings]

Re: CS 2551ci grey background

We were getting this but was a yellow background. Check the developer and main charge bias settings. (Can't remember which maintenance mode.) Adjusted to "factory specs" and voila all was good again! Mind you this was after a full maintenance kit and HVU board replacement.