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L65500 colors dis-allignments

Discussion in 'Hewlett Packard' started by amizgraf, Apr 8, 2013.

  1. amizgraf

    amizgraf New Member

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    Jul 17, 2012
    Hi,

    I'm owner of L65500, and I have a strange behavior during printing.
    Colors are verticaly dis-allignment, but it's regulary. Please see attachment.
    The horizontal lines on the left side of print test!

    I have tried to change:
    - tension power (front/back)
    - vacuum power
    - cleaning media move sensor

    Please help,
    Sorry for my english! (I'm still learning:)) )
     

    Attached Files:

  2. sballinger

    sballinger Member

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    Jul 31, 2012
    Sycamore, IL
    I believe your talking about the alignment on the "ladder" test as HP calls it. Looks like the magenta and or black will fall out of alignment and then go back. It's the substrate advancement. We have an LX850 and sometimes if your using the OMAS, this can happen. I'll turn it off and do the adjustments manually in the IPS. What type of media are you running?
     
  3. amizgraf

    amizgraf New Member

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    Jul 17, 2012
    I have tried to switch off the OMAS sensor, but it's not helping.
    Problem still exist...
     
  4. sballinger

    sballinger Member

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    6
    Jul 31, 2012
    Sycamore, IL
    No OMAS and the problem is still showing? Media could be expanding/contracting with the heat and cure zone temp changes. Fabric is the only media I've never completely fixed this problem but it looks like your running gloss vinyl, so that's weird
     
  5. amizgraf

    amizgraf New Member

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    Jul 17, 2012
    Please look at the image from atachment. It's from calibrating color test.
    I think something wrong with hardware...
    CK Printhead is really over then the others. It's normal?
     

    Attached Files:

  6. amizgraf

    amizgraf New Member

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    Jul 17, 2012
    And now i have printed one more time "fishbone" print test, but with only 2 passes in uni-direction. With or without OMAS tests looks very similar.
    It's easy to look that the strips are different with every next pass.
    Funny.
     

    Attached Files:

  7. sballinger

    sballinger Member

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    6
    Jul 31, 2012
    Sycamore, IL
    Pull and check the heads for any problems, then do an auto alignment. Try the advancement test again. If this keeps up, it could be the front or back spindle motor. There are burn-in tests that can be done by a tech to see if your motors are in spec or are slipping. We've had our front spindle motor replaced within the first year
     
  8. amizgraf

    amizgraf New Member

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    Jul 17, 2012
    Hi,
    I have try spindle burning, It's give a good result. (Front open loop - before 28894, after 40894)
    I have try also another tests:

    3.1 Spindle Motors burning - ok
    3.2 Front Spindle System - ok
    3.3 Rear Spindle System - ok
    3.4 Drive Roller - ok

    results:

    - OPEN LOOP (front) ROLL 38515 / UNROLL 38663 | OK
    - frontwinder – AVG 910 | OK
    - OPEN LOOP (rear) ROLL 99852 / UNROLL 98717 | OK
    - rewinder AVG – 0,0 | OK (strange result?, but test is OK)

    Also calibrations:

    4.3.1 Drive Roller Encoder Calibration | OK
    4.3.2 OMAS Calibration | OK
    4.3.3 OMAS temp Calibration | OK
    4.3.4 Roller Calibration | CODE3 error
    4.3.5 Check Roller Calibration | OK
    4.3.6 Reset Roller Calibration | OK
    4.3.7 View Roller Calibration | OK

    results:

    error - 4.3.4 Roller Calibration | CODE3
    Thats mean, its a encoder error, but TEST "4.3.1 Drive Roller Encoder Calibration" say its OK.
    Strange.

    additionaly checked:

    - pickup motor (by encoder) work fine
    - change substrate rolls rear/front
    - different substrates
    - calibration substrate Color Calibration, Advance
    - OMAS on/off

    nice :banghead:
     
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