No output Channels 1-8

Discussion in 'TASCAM MX-2424' started by Rick Ruskin, Oct 31, 2018.

  1. Rick Ruskin

    Rick Ruskin New Member

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    Gear:
    MX2424, 2600-32
    No output on channels 1-8. All other channels fine. The audio in/out
    board was totally recapped about a year ago but I did not test the
    machine after I got it back.
    All interior connection are fine but there is a row of status LED's on the mainboard
    labeled "XIL DeBug." The one in the middle (designated D21 or D22 -
    hard to tell) is red while all others are green. Anyone here know
    what this means?
  2. witzendoz

    witzendoz Active Member

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    From:
    Fremantle, Western Australia
    Gear:
    M3700 MX2424 MSR16S
    Have a check and make sure that inputs 1 to 8 are not assigned to a digital out option?

    Alan.
  3. Rick Ruskin

    Rick Ruskin New Member

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    All inputs are set to analog. My unit has ADAT in/out and I recall the ADAT out being active all the time.
  4. witzendoz

    witzendoz Active Member

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    I think they are active all the time in one direction, I think you may be right that it is playback.

    Alan.
  5. Rick Ruskin

    Rick Ruskin New Member

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    I'm thinking that the red status light is pointing to the problem but have no clue as to what it's trying to tell me.
  6. witzendoz

    witzendoz Active Member

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    Gear:
    M3700 MX2424 MSR16S
    Been a long time since I have seen inside while it's running, don't be surprised if it's aways red? I am wondering if there is damage to the connectors or cable, maybe pull it off and check the pins.

    Alan
  7. Rick Ruskin

    Rick Ruskin New Member

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    Gear:
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    A few more clues: Channels 3 & 7 are working properly. All others are
    silent. Analog signal goes in but no audio out. The ADAT in/out works
    fine and the incoming analog signal sounds fine when listening through
    another ADAT interface device. Even though the battery was changed, no
    settings get saved. I must re-enter my setup every time I boot the unit
    up. Would a power supply problem be causing any or all of these symptoms?

    RR
  8. witzendoz

    witzendoz Active Member

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    From:
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    Gear:
    M3700 MX2424 MSR16S
    If the adat cards is working I would check the caps on the output side of analog card, maybe blown, usually through the connection to a mixer channel with phantom power on, or the caps are just old or even bad solder joints.

    If the MX is not booting it is probably due to a flat battery on the mother board, just like you have on a normal computer to keep the settings alive when turned off.

    The main power supply sounds OK to me.
    Alan
  9. Rick Ruskin

    Rick Ruskin New Member

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    All caps were replaced because of the distorted output on the 6 non-working channels. Now the same channels have no output at all. Battery was replaced at the same time. There has to be something else going on.
  10. witzendoz

    witzendoz Active Member

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    From:
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    Gear:
    M3700 MX2424 MSR16S
    Sounds like the work was not done properly if the working channels are now not working?

    Alan.
  11. Rick Ruskin

    Rick Ruskin New Member

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    The entire board was re-capped. It'd doubtful that just the same 6 faulty channels would be bad if a that work wasn't done properly.
  12. witzendoz

    witzendoz Active Member

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    Gear:
    M3700 MX2424 MSR16S
    Sorry I thought it was 6 different channels.

    Now it's a real puzzle, I have already mentioned my usual check list. All I can think of is that there may bad / dry solder joints cracked tracking where the D-sub socket is soldered to the board. Long Shot.

    Alan.
  13. witzendoz

    witzendoz Active Member

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    From:
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    Gear:
    M3700 MX2424 MSR16S
    Hay Rick,

    Send me an email, I have the analog card schematics.

    Alan