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Thread: Syncaset Channel 4 Dead?

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    Syncaset Channel 4 Dead?

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    Hey Everyone,
    I recently replaced all the rubber parts in my Tascam Syncaset 234 and everything works like a charm except for playback on channel 4. All the other channels are working fine and the input on channel 4 works but I get no output.
    I was wondering if I left something unconnected when I was replacing the belts. Unfortunately I have no idea what to look for and since this unit was an ebay acquisition I don't know if channel 4 was broken before I got my hands on it. Anyone here have an idea of where to look or what might be the cause?
    Thanks in advance!
    -Clay Morrow

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    Update, Channel 4 not Recording?

    So I took a look inside to see if I had left something unconnected and found nothing out of the ordanary but as I tested channel 4 again it is now mysteriously able to recognize a signal at its input and can output recorded material but isn't able to record...? Help!
    -Clay

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    Arrow Make sure the Sync switch is not on.

    ..................
    Quote Originally Posted by Lt. Bob
    ... subtleties of sound make a difference to those who really listen.

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    Sync check

    Yes the sync is off.
    -Clay

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    Dead again!

    Well now channel 4 isn't working at all again... Does the fact that it works one minuet and doesn't work the next give anyone insight to the cause of the problem?
    -Clay

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    Quote Originally Posted by morbank View Post
    Well now channel 4 isn't working at all again... Does the fact that it works one minuet and doesn't work the next give anyone insight to the cause of the problem?
    -Clay
    Connections or relays (if it has them).

    Not familiar with this deck, but those are the majors.
    [COLOR=DarkSlateBlue]"Tascam, Fostex or Studers don't make hit records...........people do"[/COLOR]
    MCI2424 - 2007

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    Where to look?

    Thanks for the reply MCI2424. Would the relays be solid state (black plastic rectangles)? And would each channel have one? Also, could you specify what connections I should look at?
    -Clay

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    Quote Originally Posted by morbank View Post
    Thanks for the reply MCI2424. Would the relays be solid state (black plastic rectangles)? And would each channel have one? Also, could you specify what connections I should look at?
    -Clay
    You have to look up the part no from the realy. TASCAM used electro/mechanical relays forever. I am not familiar with the Synccassete machine though. A Reel Person probably has a dozen or so. He would be the guy to asl about this.

    Connections coming and going usually are either bad relays, cold solder joints, or bad connections to PC cards and cable connectors in general.
    [COLOR=DarkSlateBlue]"Tascam, Fostex or Studers don't make hit records...........people do"[/COLOR]
    MCI2424 - 2007

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    Gotcha

    Thanks MCI242, I'll poke around a bit and see if I can't find the culprit!
    -Clay

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    Getting Warmer...

    OK, I opened the 234 up and looked around but after inspecting it's innards and wiggling some connecters I didn't find anything out of the ordinary. But I did discover that when I turn the DBX Noise Reduction switch in the rear to "out" channel 4 works perfectly!? This is fine for playback but the recording on this unit really suffers without the Noise Reduction engaged. I also noticed that there are 8 DBX IC's on one of the PCB's inside, could one of these be the cause?
    Thanks again to everyone who has helped me get this far!
    -Clay

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