Debugging a Panasonic WJ-MX10

Discussion in 'Professional Video Production' started by kpfeif, Dec 9, 2004.

  1. kpfeif

    kpfeif Guest


    I am *certainly* new to video, so please be kind :)

    Anyhow, work was "cleaning house" last week and was throwing away a
    Panasonic WJ-MX10 A/V Mixer. I asked if it worked, and I got a "as far
    as I know" answer.

    I took the thing home and tested out the audio side. They work fine.
    The video side of the unit is perplexing. This is not shocking
    considering how little I know about video.

    The inputs on the back (see for photo) are,
    according to Panasonic...

    1.0V[p-p]/75ohm NTSC composite signal, BNC connector

    I have a bunch of RG6 laying around, so I took some F-to-BNC adapters,
    attached them to the composite output of a VCR and the composite IN of
    a TV, and tried it out. While I could see the video, everything looked
    "scrambled." Note that the unit has a "Sync Out," but no "Sync In".
    Also, there's light on the front panel that says "Sync Warning" and is
    ALWAYS lit.

    Any ideas on how I can test this?

    kpfeif, Dec 9, 2004
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  2. It appears that the video inputs are loop-through. Does it have
    termination switches? Or are you using 75-ohm terminators on
    the unused connectors?

    Or maybe the "genlock input" wants a stable video signal?

    I'll buy it for a reasonable price if you don't want it. I think I
    once bought a service manual for it on eBay.
    Richard Crowley, Dec 10, 2004
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  3. kpfeif

    Stan Guest

    }Anyhow, work was "cleaning house" last week and was throwing away a
    }Panasonic WJ-MX10 A/V Mixer.
    }I have a bunch of RG6 laying around, so I took some F-to-BNC adapters,
    }attached them to the composite output of a VCR...

    A VCR with a stable sync? Or a consumer VCR with crappy sync?

    }Note that the unit has a "Sync Out," but no "Sync In".
    }Also, there's light on the front panel that says "Sync Warning" and is
    }ALWAYS lit.
    }Any ideas on how I can test this?

    Try a video source with a rock solid sync...a VCR with a signal coming
    through the tuner (i.e. not playing a tape) will do. Or a video out
    from a camcorder _not_ in the play mode, but viewing through the lens.

    Stan, Dec 10, 2004
  4. kpfeif

    kpfeif Guest

    I'll sell it for a reasonable price, also. I have no idea what that
    price may be, however.

    I guess name a price. I know what they go for on ebay, so while I'm
    not looking to get that much, I'd obviously like some sort of

    kpfeif, Dec 11, 2004
  5. I don't know what they've been going for on eBay (nor how to find
    that info?) so I don't know whether it might be worth it to me.
    Richard Crowley, Dec 11, 2004
  6. kpfeif

    Joe Kultgen Guest

    Just a thought but what color is the sync warning light? On my MX12 it
    is also on constantly but is green when sync is happening and orange when
    there is a problem.

    On the MX12 I believe the sync is generated by the TBC on the second
    video channel. If the second channel isn't part of the output the
    warning comes on. Try hooking your input to source two and your output
    to video one then play with the mixing controls.

    Joe Kultgen, Dec 12, 2004
  7. kpfeif

    Joe Kultgen Guest

    I'm guessing this is just a typo and you used a F-to-RCA adapter to attach
    the cable to the VCR. I don't know of a consumer grade deck that has
    composite BNC and any F connection is something other than composite.

    I'm also new at this. Sometimes it takes a new guy to figure out what the
    other new guy is doing. We make mistakes the pros would never imagine. :)

    Joe Kultgen, Dec 12, 2004
  8. kpfeif

    kpfeif Guest

    You're right - that was a type.

    The color of the light is orange. I'll hook things up to Source 2 and
    give it a try.

    Ok, it's time for me to learn: what is sync? I have a Sony CRT
    projector, and I know there's some sort of "sync on green" switch in
    there...does this have to do with interlacing?

    kpfeif, Dec 12, 2004
  9. kpfeif

    david.mccall Guest

    While we are all guessing, I'll do that too just because that is
    what I do most of the time.

    He probably means "F-Connector". Cable TV is mostly using RG-6
    (to accommodate broadband and Digital Cable), so it is not unlikely
    that he has RG-6 with the F connectors already installed. using
    F to BNC adapters does make sense to me. I'm not saying it
    doesn't exist, but I've never seen a BNC connector that is
    designed for RG-6 that he could use to replace the F
    connectors, and BNCs can be a challenge to
    put on anyway. Not as bad as most of the
    newer ones though (S, USB, I-link, etc)

    I am not an engineer, but I wouldn't think cable or connectors
    would cause the picture to garble like that. Doesn't the MX-1
    lock to one of the inputs (maybe input 1??). then other inputs
    get synced to that input with the internal TBC. Was that a unit
    that had 4 inputs, but you could only go between 2 inputs at
    a time. That is to say the next input had to be selected
    on a bus 1st, you couldn't just go directly to it. The problem,
    as described, does sound like missing sync.

    david.mccall, Dec 12, 2004
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