Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1
    Senior Tech 100+ Posts
    Join Date
    Jul 2012
    Location
    harare
    Posts
    100
    Post Thanks / Like
    Rep Power
    0

    KM 2550 BLANK COPIES

    Sorry guys hv been away a while but still have my machine with the problem of blank copies, i have tried nearly everything on it on another working machine,they all fine, i mean dev unit ,drum unit,laser unit,all boards except power source pcb, all things seems working, could it be my power board, any suggestions, the best i got is a very faint image on one edge if i set all my settings on darkest.

    Could it be my dev bias, hw can i check it ,if its likely


  2. #2
    Field Supervisor 500+ Posts



    Join Date
    Feb 2010
    Posts
    726
    Post Thanks / Like
    Rep Power
    19

    Re: KM 2550 BLANK COPIES

    Did you replace the High Voltage board?


  3. #3
    Senior Tech 100+ Posts
    Join Date
    Jul 2012
    Location
    harare
    Posts
    100
    Post Thanks / Like
    Rep Power
    0

    Re: KM 2550 BLANK COPIES

    SURE i even tried it on another machine, its fine


  4. #4
    Field Supervisor 500+ Posts



    Join Date
    Feb 2010
    Posts
    726
    Post Thanks / Like
    Rep Power
    19

    Re: KM 2550 BLANK COPIES

    Go ahead with the Power Supply board. Sorry, I have to ask....it's blank on internal prints too, right? Cuz these machines have an issue with mirrors clouding up.


  5. #5
    Master Of The Obvious 5,000+ Posts


    blackcat4866's Avatar
    Join Date
    Jul 2007
    Location
    Lapeer, Michigan
    Posts
    10,297
    Post Thanks / Like
    Rep Power
    153

    Re: KM 2550 BLANK COPIES

    Is there any latent developed image? I'm guessing no. =^..^=

    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.


    blackcat: Master Of The Obvious =^..^=

  6. #6
    Field Supervisor 500+ Posts



    Join Date
    Feb 2010
    Posts
    726
    Post Thanks / Like
    Rep Power
    19
    Very faint on the edges


  7. #7
    Master Of The Obvious 5,000+ Posts


    blackcat4866's Avatar
    Join Date
    Jul 2007
    Location
    Lapeer, Michigan
    Posts
    10,297
    Post Thanks / Like
    Rep Power
    153

    Re: KM 2550 BLANK COPIES

    So there may be a transfer or separation charge loss, but you won't know for sure until the first problem is resolved. You could have developing drive issues, but I think that's unlikely, it would affect image quality evenly in the main scan direction. Your primary charge is intact or you'd have black prints. Drum ground fault would also affect the image quality evenly in the main scan direction.

    That leaves developing bias voltage, or possibly a generic toner or wrong toner issue.

    Personally, I'm leaning towards wrong toner. Any remnants of OEM toner would remain at the far ends of the developing unit.

    Change the toner and vacuum out the developing unit. Then run U130 to refill the developing unit. Otherwise it could take several hundred pages to deplete the generic/wrong toner. =^..^=

    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.


    blackcat: Master Of The Obvious =^..^=

  8. #8
    Senior Tech 100+ Posts
    Join Date
    Nov 2007
    Posts
    194
    Post Thanks / Like
    Rep Power
    15

    Re: KM 2550 BLANK COPIES

    Check the metal contacts that go from the High Voltage Board to the Transfer/Separation and Drum/Developer. They are think metal strips which are mounted to a plastic housing. I've had a flange that seats the metal strip break and there wasn't proper connection between the contact and the transfer roller.


    Contacts.pdf


  9. #9
    Senior Tech 100+ Posts
    Join Date
    Jul 2012
    Location
    harare
    Posts
    100
    Post Thanks / Like
    Rep Power
    0

    Re: KM 2550 BLANK COPIES

    thanks guys ,i hv tried nearly everything on this machine but still NO breakthrough, my only conclusion could be a broken cable or something related to wiring,however am still willing to try anything . i got a working machine beside this faulty one. what else can i try,

    any suggestion is most welcome no matter how stupid it may sound


  10. #10
    Master Of The Obvious 5,000+ Posts


    blackcat4866's Avatar
    Join Date
    Jul 2007
    Location
    Lapeer, Michigan
    Posts
    10,297
    Post Thanks / Like
    Rep Power
    153

    Re: KM 2550 BLANK COPIES

    Do internal prints come out OK? From what you've said, all that's left is wire harness and charge contacts. That's all I've got. =^..^=

    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.


    blackcat: Master Of The Obvious =^..^=

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Get the Android App
click or scan for the Copytechnet Mobile App

-=-=-=-=-=-


Lunarpages Internet Solutions

Advertise on Copytechnet

Your Link Here