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Need Help SP-540v Printhead Issue Blowing Fuse

Discussion in 'Roland' started by Nate.H, Oct 15, 2020.

  1. Nate.H

    Nate.H New Member

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    Oct 15, 2020
    Augusta, GA
    Hi there, I'm new to the forum, but I've come across it a lot through my troubleshooting ventures, so I'm hoping the lovely folks here in the Sign101 community can help me. I have some basic electrical experience and soldering skills, but I'm not 100% confident where to look next with this particular issue.

    The Issue:
    I have a VersaCamm SP-540v that, I believe, has a short-circuit or some other electrical issue. About a year ago, the printhead fuses both blew. I was able to replace them and it's been working fine until just last week when they blew again. This issue was made evident when it began printing only black and blue ink.

    I replaced the fuses again, but when I ran the test print, it went back to only black and blue. After investigating further, I saw that one of the new fuses had blown again (the one on the left in slot F3). From what I've gathered from online forums, I believe it may be related to a short circuit maybe in the printhead or somewhere in that area. Before purchasing the $700 printhead, I want to make sure (with your help) that the printhead is, indeed, the issue and it's not something else.

    Troubleshooting Steps I've Performed:
    • Tried replacing the fuses, but that resulted in another blown fuse.
    • I've checked all 4 ribbon cables connected to the printheads for continuity and they are all working properly.
    • I checked the transistors because I read somewhere that they may be the source of similar electrical issues. I'm not entirely sure how to check the transistors, but I did notice that the C4131 transistor which is second to the left on top was returning an open connection between the two sides (I assume Emitter to Collector), where all other transistors return around 40 when connecting the two sides.
    I have another Roland printer (SP-540i) that I could try swapping some parts for troubleshooting (assuming the printheads are the same type), but I'm hesitant to do that since that's our only working printer at the moment. I'd hate for one of those parts to break in the process.

    Can you offer any advice for troubleshooting this issue and identifying the parts that needs to be replaced?

    Thanks,
    Nate
     

    Attached Files:

  2. Jim Hancock

    Jim Hancock Member

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    Nov 11, 2008
    Delray Beach, Florida
    Nate,

    To be clear, you are reading 0 ohms on the transistor circled in the picture, correct? If so, that is a short, not an open, and will continue to blow the fuses until it is replaced. Once it and the fuse are replaced, you will be able to determine if the printhead is ok. If the fuse blows again after replacing both, than you most likely have a bad head. If you cannot repair the board, or have someone who can, that is a service I offer.
     
  3. Nate.H

    Nate.H New Member

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    Oct 15, 2020
    Augusta, GA
    Ah yes, thanks for the clarification, I’m still learning :)

    And thank you for confirming the short in the transistor. I’ll replace the transistor and fuse and see what happens.
     
  4. Jim Hancock

    Jim Hancock Member

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    Nov 11, 2008
    Delray Beach, Florida
    How did your repair go?
     
  5. Nate.H

    Nate.H New Member

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    Oct 15, 2020
    Augusta, GA
    Thanks for checking in. I'm still waiting for the parts to come in. They should be here today or early next week (fingers crossed).
     
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