Question about Xerox Phaser 7400/N Printer

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Xerox Phaser 7400 U28 error message

Cyan Imaging Unit defective

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The Service manual says:


The Drum Phase Sensor for the named Imaging Unit indicates that the drum is out of position.


Initial Actions:

Reseat the indicated Imaging Unit.
Cycle the printer's power.

after these steps it gets a lot more detailed and you would need to be an experienced tech to understand everything and follow the steps within a timely manner, if reseating the cyan imaging unit doesn't fix the problem, then you will have to call for service.

Hope that helps

Christopher

Posted on May 20, 2012

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SOURCE: Cyan Imaging Unit Failure, U28 Error Code

I just got that error couple of weeks ago on my 7300. I did everything you did and nothing so I ended up visiting www.iteminconline.com. I called them up and they told me to check all the cables on the engine control board 116-1538-00. I made sure the white data cables where connected and still nothing so they recommended me to buy a engine control board. That did the trick. Hopefully this will help you.

Posted on Oct 06, 2009

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StevenC82

Steven C

  • 160 Answers

SOURCE: xerox phaser 7400 giving error

Did it specify a color you should replace? The machine has 4 image units (CMYK) each with a different part#. Replacing them is easy, no tools required. Open the top door, lift out the entire image unit, move the toner over to the new unit, and lower the image unit. Here are the part #'s for the 7400 for each color. Iteminc.com has these online.
C - 108R00647
M - 108R00648
Y - 108R00649
K - 108R00650
Good luck, hope this helps. Thanks for using FixYa!

Posted on Aug 11, 2011

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I have blue lines appearing down one edge of the paper printouts


This is caused by either a problem with the Transfer Belt Unit or the Cyan Imaging Unit. Since the lines are only in Blue (Cyan) I would more suspect the Cyan Imaging Unit. These can be released and slid out of the machine very easily and you could look at the drum to see if the lines are there. When you slide out the unit the drum (long greenish colored cylinder) is right there on top and it should be clean with no toner lines on it. If there are lines then that would be your proof. Also try using your cleaning tools on the Imaging Units as well. This is the wand that is clipped inside the front door. There are also little blue knobs on the units you can pull out and push in a few times to clean wires inside the units. This will sometimes fix the lines. If not you may have to have the Cyan I/U changed.
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Hi, C-2551 on the bizhub C250 means the sensor that measures the Cyan toner level has detected it as low.
It's likely to be the Cyan Imaging Unit has failed. But you can do a couple of things first though.
Remove the Cyan toner, give it a shake and refit.
Remove the Cyan Imaging Unit, give it a gentle tilt (45 degrees or so). Tilt it backwards and forwards a few times, then refit.
Hopefully the code will be gone.
If not, it sounds like the Cyan Imaging Unit is faulty.

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Hi, C-2551 on the bizhub C250 means the sensor that measures the Cyan toner level has detected it as low.
It's likely to be the Cyan Imaging Unit has failed. But you can do a couple of things first though.
Remove the Cyan toner, give it a shake and refit.
Remove the Cyan Imaging Unit, give it a gentle tilt (45 degrees or so). Tilt it backwards and forwards a few times, then refit.
Hopefully the code will be gone.
If not, it sounds like the Cyan Imaging Unit is faulty.

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1 Answer

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Hi, C-2552 on the bizhub C250 means the sensor that measures the Cyan toner level has detected it as abnormally high.
It's likely to be the Cyan Imaging Unit has failed. But try this first..
Remove the Cyan Imaging Unit, give it a gentle tilt (45 degrees or so). Tilt it backwards and forwards a few times, then refit.
Hopefully the code will be gone.
If not, it sounds like the Cyan Imaging Unit is faulty.

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or, call a qualified KonicaMinolta tech to check out and service your machine.

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Opening and shutting the main front door is the reset procedure. However if this doesn't work you should try the following
Remove the Cyan imaging unit, give it a bit of a shake and then refit.
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You should print the "Repeating Defects Page" Using the printer's front panel menu keys perform the following steps:
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Most likely you have a defect on your magenta imaging unit. Switch the Magenta and Cyan imaging units and try the test print....if you have blue spots 3 3/4 then it is the imaging unit (drum). If not you may need to change the belt cleaner assy.

If it isn't the imaging unit then it will be a problem with the fuser rollers, so replace the fusing assembly.

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