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  1. #1
    Service Manager 1,000+ Posts bilyahn's Avatar
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    MXM5071 F2-78 and now dark copies

    Going back to this one today. Installed about a month ago then 2 weeks ago it gets an F2-78 PCS sensor error. Unit had toner all over the rear side of the drum and transfer roller. Cleaned everything, checked transfer roller connectors, updated the ROMs and calibrated. Yesterday call comes in about dark copies. I am taking another transfer unit and will check the ribbon cable more closely this time but wondering if anyone has seen something like this. (I'm making a guess that the calls are related since I have not seen the current problem

    Thank you for your time and effort in this matter.

    Bil

    PS Charge unit was covered in toner on rear side at last call also. I am also taking a DV unit and drum unit. Had no problem during the initial install with calibration so wondering if I am looking in the wrong direction with xfer roller. Could it be something as simple as a bad DV unit????

  2. #2
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    Re: MXM5071 F2-78 and now dark copies

    Bil,

    May be a little late, but there is a service bulletin for this; MFP-TB-1567. They added a protective sheet to keep toner off the sensor.

    GridSquid

  3. #3
    Service Manager 1,000+ Posts bilyahn's Avatar
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    Re: MXM5071 F2-78 and now dark copies

    Okay so far I have replaced the following items

    Drum frame
    drum
    charge
    DV unit
    Developer
    xfer roller

    Reseated and checked all connections, ROMs are current. Put it back together and everything looks promising. Calibrated just fine and there is no developer material or excess toner on the drum.

    Bil

  4. #4
    Service Manager 1,000+ Posts bilyahn's Avatar
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    Re: MXM5071 F2-78 and now dark copies

    Quote Originally Posted by GridSquid View Post
    Bil,

    May be a little late, but there is a service bulletin for this; MFP-TB-1567. They added a protective sheet to keep toner off the sensor.

    GridSquid
    I did see this TB and thought about installing the mylar. It's definitely something to consider but the sensor doesn't seem to be covered in toner at all.

    Thank you

    Bil

  5. #5
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    Re: MXM5071 F2-78 and now dark copies

    It has been a good while since I saw that one instance. When I read the part of your post that said the sensor didnt have much toner on it, if at all, it jogged my memory. I remember thinking at the time that the protective sheet probably wouldnt resolve it because the sensor was the one part not covered with toner. That said, the problem didnt come back. So...one more item on the long list of things I dont understand.

  6. #6
    Service Manager 1,000+ Posts bilyahn's Avatar
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    Re: MXM5071 F2-78 and now dark copies

    Quote Originally Posted by GridSquid View Post
    It has been a good while since I saw that one instance. When I read the part of your post that said the sensor didnt have much toner on it, if at all, it jogged my memory. I remember thinking at the time that the protective sheet probably wouldn't resolve it because the sensor was the one part not covered with toner. That said, the problem didnt come back. So...one more item on the long list of things I dont understand.
    Had the F2-78 error code on this unit twice and both times it was because of developer pulled out of the unit but the sensor itself was not covered, go figure. Funny thing was the images were still good in both instances just developed a band across the top of the copies/prints even though most of the developer material was pulled from the unit (not your typical light or splotchy copies). A lot of Sharp "fixes" have me scratching my head sometimes LOL they seem more like a shotgun blast in the dark instead of fixing the underlying problem IMHO....

    Have a great weekend. I will be going back to this machine early next week to see where we stand. I'm hoping it is resolved unit only has 15K.

    Bil

  7. #7
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    Re: MXM5071 F2-78 and now dark copies

    Fingers crossed for you Bil. I cant for the life of me remember which of our customers had this F2-78. I have lost access to our system (eAutomate), so cant do any searches. Would love to follow up. Like most places, I'm sure, we spend our time putting out fires, and not much time in fire prevention.

    I share your head scratching at some of Sharp's bulletins.

    GS

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