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Undefined Media

Discussion in 'Mutoh' started by Brian M, Mar 5, 2020.

  1. Brian M

    Brian M New Member

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    Mar 5, 2020
    Richmond
    Hi,

    My company has a Mutoh ValueJet 1638. When I go to set up a media type it just automatically gives me the "Undefined Media" error without even bothering to measure the media thickness or width.

    Any idea on how to remedy this?

    Thanks
     
  2. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Aug 2, 2011
    Denver, CO
    Did this just happen out of the blue? Are you using clear material by chance? It basically means the sensor that detects whether there is material in the machine or not is not detecting properly. Usually it's because there is light getting into the sensor but sometimes it needs to be adjusted.
     
  3. ColorCrest

    ColorCrest Active Member

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    Dec 11, 2017
    So Cal
    From the back of the machine when loading the media, try shifting the roll to the right a half-inch or so.

    Let us know what happens.
     
    • I Appreciate You I Appreciate You x 1
  4. Brian M

    Brian M New Member

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    Mar 5, 2020
    Richmond
    I adjusted the material a few positions and it still happened. It did start happening out of the blue. I've tried setting up rigid material, white corrugated plastic and white cardboard material. Both opaque. How do I adjust the sensor?
     
  5. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    That machine is not made to print rigid material which is probably the issue. Normally the vinyl will wrap around the platen and cover that sensor. The rigid material doesn't wrap around it so light gets in and trips the sensor. The materials you are using are simply too thick for that machine.
     
    • I Appreciate You I Appreciate You x 1
  6. Brian M

    Brian M New Member

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    Mar 5, 2020
    Richmond
    Are you sure about this? The ValueJet 1368 has a setting for rigid or roll and we've been advised that the maximum thickness is much larger than the corrugated material that we use.
    We have had the printer for a few years and up until now it's printed on rigid material perfectly. So I'm thinking there's a larger issue here.

    Anyways, I've also been advised that the sensor on the head may have been covered with too much ink so cleaning it might help, but I'm not exactly sure where the sensor is on the head. Does anyone have a general idea of where it is located on the head? The answer to this is a lot harder to find online than I had anticipated.

    Thanks for your help.
    Brian M
     
  7. iPrintStuff

    iPrintStuff Prints stuff

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    Sep 3, 2018
    United Kingdom
    can I see a video of it printing on rigid material please
     
  8. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Denver, CO
    Oh you must have the VJ1638UH. That's a hybrid printer that does print on rigid. You can adjust the sensor by going into service mode. Hold the up, right and down buttons while powering on. Once it boots up, go to the adjustment menu. There will be an option in there to calibrate the Rear/Edge Sensor. Enter that menu and follow the prompts. It adjusts automatically but you do have to load material and unload at certain points.
     
  9. Brian M

    Brian M New Member

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    Mar 5, 2020
    Richmond
    Ah yes. I didn't think the UH part of Valuejet 1638UH was important.
    That is a great tip about the powering on menu, but do you happen to know what the menu option is? So far I tried Check 1: Adj Headgap -> Adj. Type [Sensor] -> but then it says Gap Adjust Failed. Were you thinking of another menu option?

    Unfortunately since I can't set up any media right now I can't print at the moment.
     
  10. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Denver, CO
    You want to look for the "Check 5: Adjustment" menu a few menus down.
     
  11. henryp

    henryp Member

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    Sep 25, 2006
    Sydney Australia
    Please see attached screenshots
     

    Attached Files:

  12. Brian M

    Brian M New Member

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    Mar 5, 2020
    Richmond
    These are great tips, but when I go to do a Rear/Edge Sensor Adjustment I hit a roadblock when it tells me to set the media. The problem has been that the machine won't let me set any media without giving me the "Undefined Media" message and I guess that doesn't change despite being in a different menu.

    The sensor might simply be broken...
     
  13. henryp

    henryp Member

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    You can test the functionality of the sensor under the Sensor Menu number 9 inside the Test Menu, see attached screenshot
     

    Attached Files:

  14. Brian M

    Brian M New Member

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    Mar 5, 2020
    Richmond
    Are you talking about the Media Rear [P_REAR Sensor] menu option? The Media Rear setting is on 242 and the Edge AD setting is on 5. I can't seem to change either of those. Are those numbers what they should be or do those numbers indicate a problem?

    Thanks,
    Brian M
     
  15. henryp

    henryp Member

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    Sydney Australia
    Run the test with and without media covering the sensor, you should see a huge swing on the readings. If you don't, the sensor is faulty.
     
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