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  1. #1
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    C6500 - color density problem

    Hi!

    I have a konica minolta c6500 problem...
    color density of printing are very low

    transfer belt itís new, coronaís changed...

    inservice mode, I set auto gamma adj. and color registration...
    no change...

    I stopped it to see color density on transfer belt
    in test mode i put +125 and itís very low and at +255 itís near but not enough

    I attached some pictures maybe someone can help me and point me to the right direction

    thanks!
    stefan
    Attached Images Attached Images

  2. #2
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    Re: C6500 - color density problem

    You should mention more details like meter count, developer and drum count, toner used (OEM or some replacement)...
    Is problem just magenta or all colors?

  3. #3
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    C6500 - color density problem

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    Re: C6500 - color density problem

    one color or all colors?
    if you suspect one color, tape up the DV inlet hole and swap DV units/drums around and see if the problem stays with the DV unit or the color slot.
    alway leave the toner door open when testing this so it wont try to add toner.
    We know a thing or two because we've seen a thing or two.
    Also don't ask me for files without a contributor badge.

  4. #4
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    Re: C6500 - color density problem

    Quote Originally Posted by Toxic View Post
    You should mention more details like meter count, developer and drum count, toner used (OEM or some replacement)...
    Is problem just magenta or all colors?
    developer units are all changed, they have around 5000 listed pages
    drums have ~ 10000 pages ...
    toner oem

    it makes on all colors ...



    Quote Originally Posted by Synthohol View Post
    one color or all colors?
    if you suspect one color, tape up the DV inlet hole and swap DV units/drums around and see if the problem stays with the DV unit or the color slot.
    always leave the toner door open when testing this so it wont try to add toner.
    there are all colors

    I'm not sure but I think this problem starts after a deep cleaning ...
    also replace corona's and transfer belt ...

    I checked again all contacts and rollers ... to be smooth area to all contacts ... CMY on left of transfer belt chassis and black with 2th transfer roll to the right of transfer belt ...

    also cleaned transfer roll from front of fusing unit ... checked again to be smooth area in front of machine ...


    on transfer belt, I stopped in the middle of transfer on the belt, and I saw large amount of toner on transfer belt, after separation, half on the page and half on the belt ...

  5. #5
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    Re: C6500 - color density problem

    Then it must be some problem with 2nd transfer process.
    Did you put back 2nd transfer roller corectly?
    Also check earth plate on lower transfer roller (before fusing unit).
    Did this problem occur after service or was there before replacing parts?

  6. #6
    Certified Konica Expert 2,500+ Posts
    C6500 - color density problem

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    Re: C6500 - color density problem

    Yes, make sure the wire is plugged in good for the 2nd TX assy
    We know a thing or two because we've seen a thing or two.
    Also don't ask me for files without a contributor badge.

  7. #7
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    Re: C6500 - color density problem

    Quote Originally Posted by Toxic View Post
    Then it must be some problem with 2nd transfer process.
    Did you put back 2nd transfer roller corectly?
    Also check earth plate on lower transfer roller (before fusing unit).
    Did this problem occur after service or was there before replacing parts?
    I say that it's correctly ... smooth area inside the printer... where is a screw and connector with plastic piece that touch the roll

    Earth I checked 5 time till now, and again now ... I made also some pictures with position of the roll

    I didn't checked before because it was full of toner inside and transfer belt was damaged

    Quote Originally Posted by Synthohol View Post
    Yes, make sure the wire is plugged in good for the 2nd TX assy
    You say about 2nd transfer roller before fusing unit?




    L.E.

    I think I solved it ... I don't know how I saw it ... but I saw ...
    Inside of the machine, the connector for 2nd assy was damaged ...

    Last edited by zmeutz; 10-17-2021 at 06:15 PM.

  8. #8
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    Re: C6500 - color density problem

    Quote Originally Posted by zmeutz View Post


    You say about 2nd transfer roller before fusing unit?

    I think Synthohol mean connector for discharging assy, right after lower transfer roller.
    I would check 2nd transfer roller pressure mechanism, pressure release motor, cam, pressure arm...
    Try to change pressure and see is there some difference in transfer.

    Edit:you edited last post so i have too, that broken connector definitely could be the problem

  9. #9
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    Re: C6500 - color density problem

    Quote Originally Posted by Toxic View Post
    I think Synthohol mean connector for discharging assy, right after lower transfer roller.
    I would check 2nd transfer roller pressure mechanism, pressure release motor, cam, pressure arm...
    Try to change pressure and see is there some difference in transfer.

    Edit:you edited last post so i have too, that broken connector definitely could be the problem

    problem not solved ... still persist ...

    I will try to check transfer belt, 2nd transfer roller pressure mechanism,
    pressure release motor(can I check from service menu if it turn on or off?)
    cam?
    pressure arm?

  10. #10
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    Re: C6500 - color density problem

    If you dont have SM i suggest you find it, if you want to do something on this machine.
    Some things is hard to explain, lot easier with SM and theory of operation.
    How did you resolve that broken connector?
    Transfer pressure bellow from SM
    2nd transfer.jpg

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