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  1. #1
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    MX5001 back half of black images greatly faded

    Customer had labels stuck on primary transfer. Able to get working OK but had small gouge in it where customer tried to get label with fingernail. Replaced with new unit.

    Replaced Black drum and MC kit as label on drum also. (Had 77K on the black meter). Did sims for new belt and for drum change. Ran 100 test copies -all OK.

    4 days later got call saying copies from front to back-(not lead to trail) having the back half very faded (evenly so)...~ back 1/2 all faded the same level (barely readable).

    Swapped Black Process Unit with Cyan Drum unit and still same issue( still back half faded).
    Also Note, if run one color such as cyan or green prints then print OK. Other misc notes:Cleaned LSU cover glass also with drum out, lifted cover and viewed LSU cover glass with flashlight.
    Additionally, prints are then same whether on platen,scan or internal test prints. Just in case - changed out black developer and recalib. with sim. settled at 128. Also to rule out various misc, also checked toner motor.

    Thought maybe cam on belt acting up. Since still had old belt unit so put it back in. THEN entire page printed faded??? So put the (new) belt back in, then again only back to only 1/2 faded. (and did screw belt into place)

    Checked rear contacts etc. Then once again, put back in old belt and again full page faded. Checked the machine mounting guides for belt - they are OK. Swapped back to new belt and again 1/2 faded. Belts is seating on frame as should be.

    This really has all 3 of our techs stumped. NEED HELP. customer is a large 40 person office and uses this for their only incoming fax machine (they get about 10 important faxes per hour) Also they print ledger color maps etc.& without a back up machine for ledger prints) Thanks for assistance.

    Last edited by Sam Tofu; 10-13-2011 at 08:47 AM. Reason: added more details

  2. #2
    Field Supervisor 500+ Posts igi's Avatar
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    Re: MX5001 back half of black images greatly faded

    hi
    S.T
    did you try just the belt or the whole belt unit




  3. #3
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    Re: MX5001 back half of black images greatly faded

    There was a bulletin released in November of '10, stating there was an issue with the black toner splattering on the rear side of the BK DV tank, making the main charge dirty and causing an increase in drum potential, leading it to pull excessive amounts of DV out and cause blank areas and other print irregularities. If your machine was produced before November 2010, use part PSEL-0966FCZ1 and replace your DV, problem should resolve.


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    Re: MX5001 back half of black images greatly faded

    Thanks for input.
    Yes we replaced the entire belt unit (did not rebuild).
    Checked for toner leaking in back as well as proper toner dispensing.
    Since we did think a possibility of dv exhausted with maybe improper toner fill - we did replace developer and recalibrate. Doing dv sim yielded a good setting of 128.


  5. #5
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    Re: MX5001 back half of black images greatly faded

    I would confirm that your LSU shutters are opening properly. Also check in sim 6 the operation of your transfer belt and watch it rotate with the front door open. If the machines has a old style clutch that operates the transfer belt cams, it can fail or become intermittent as the wires on the clutch can move around and short out.

    In the mean time you could setup inbound routing for the customers faxes until you get the problem fixed.

    Evil will always triumph because good is dumb.
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    Re: MX5001 back half of black images greatly faded

    Just had a b401 doing same thing replaced belt unit and same problem, May want to look at the transfer roller in unit not being seated correctly. We put a belt unit in from a working machine and it was fine.


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    Re: MX5001 back half of black images greatly faded

    Quote Originally Posted by copyguy1 View Post
    Just had a b401 doing same thing replaced belt unit and same problem, May want to look at the transfer roller in unit not being seated correctly. We put a belt unit in from a working machine and it was fine.
    Hi copyguy, the slider arm that pushes the transfer roller down probably broke free of the frame of the transfer unit in your case.

    Ive seen the exact same thing on the 401 as described. The white plastic slider twists and does not push the roller down to the drum and you get half the image missing. Ive been told the factory has made a stronger post to support this slider.

    Attached Images Attached Images
    Evil will always triumph because good is dumb.
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    Re: MX5001 back half of black images greatly faded

    Thanks Lawrence
    We set them up with a loaner MFP for faxes.
    I will go out tomorrow and check out your other suggestions.
    ONE thing that came up today was I ran a 44-6.
    I got a K-HV-ERR (K high density process continuity abnormality). So I was thinking about pulling the Hi Volt board and checking the contacts etc.

    Hopefully some of your suggestions will do the trick.


  9. #9
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    Re: MX5001 back half of black images greatly faded

    Sort of shooting in the dark on the err that came up when running 44-6
    K-HV-ERR (K high density process continuity abnormality)

    Anyone have idea what this relates to? We are assuming it is a direct tie in to the fading issue

    Thanks


  10. #10
    The Wolf 1,000+ Posts mojorolla's Avatar
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    Re: MX5001 back half of black images greatly faded

    I would do the high voltage adjustments in SIM 8. This will tell you if the HV board is bad or out of calibration, both transfer and charge. I have seen a few of these drift from time to time. Do a panic stop and see what the image looks like on the IT belt. If it is good on the belt, you have a transfer or pre-transfer issue. Density sensors clean? On a 20 amp breaker?

    Last edited by mojorolla; 10-15-2011 at 02:24 AM.
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