Noise problem on mx2424

Discussion in 'TASCAM MX-2424' started by Antoine Colombani, Oct 6, 2018.

  1. Antoine Colombani

    Antoine Colombani New Member

    Joined:
    Oct 2018
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    Gear:
    MX 2424 DV-RA1000
    Hi,
    I have a problem on my mx2424.
    I get noise on track 19 when play, if track 20 play to. Track 20 works well. If track 20 play there is noise on 19 output.
    I check db25, cable, this is not it.
    I think problem comes output card, what do you think ?
    Antoine
  2. witzendoz

    witzendoz Active Member

    Joined:
    Sep 2012
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    From:
    Fremantle, Western Australia
    Gear:
    M3700 MX2424 MSR16S
    What output card have you got fitted?

    Alan.
  3. Antoine Colombani

    Antoine Colombani New Member

    Joined:
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    Gear:
    MX 2424 DV-RA1000
    This is the analog card.

    Antoine
  4. witzendoz

    witzendoz Active Member

    Joined:
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    From:
    Fremantle, Western Australia
    Gear:
    M3700 MX2424 MSR16S
    First thing to check is that there are clean contacts on the ribbon cables.

    The next thing to check is the main caps, one of the cards I got hold of had been subjected to phantom power, someone connecting the MX analog card to a mixer with mic xlr's with the phantom on, a sure way to screw the card. I replaced the 48 caps and the board sprung back into life. It could be that one of the caps has leaked accross the board causing cross channel problems.

    I used a different cap with better specs, here is a RS components link. A bit of a tight fit but OK.

    Here are some photos of the work.

    Alan.
    Last edited: Oct 8, 2018
    Caveman likes this.
  5. Antoine Colombani

    Antoine Colombani New Member

    Joined:
    Oct 2018
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    Gear:
    MX 2424 DV-RA1000
    Hi,
    I checked the contacts on the ribonn cable, and I replaced the 2 caps, the problem is not fixed.
    It could be a common way on the circuit. I will search.

    Antoine
  6. witzendoz

    witzendoz Active Member

    Joined:
    Sep 2012
    Messages:
    496
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    37
    From:
    Fremantle, Western Australia
    Gear:
    M3700 MX2424 MSR16S
    When you say you replaced the 2 caps, do you mean on the noisy channel? I thought that you had noise caused by 2 channels, 19 and 20 as they seem to interact with each other. Just have a very good look at the circuit board around the 2 channels, there could be some contamination on the circuit board that is causing a short.

    There could also be a dry or cracked solder joint in there somewhere. You will need a magnifying glass to see.

    Alan.