414mkii track 1 recording issue

Discussion in 'TASCAM Analog Forum' started by jb544, Apr 19, 2021.

  1. jb544

    jb544 New Member

    Joined:
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    Gear:
    Tascam portastudio 414mki
    Got my portastudio a while back, used the shit out of it, a few months later noticed Track 1 starting to have a hard time recording. The input into the line was fine, levels were metering correctly, but when I went to play back the recording, it started to appear grainy and wavy and quiet. The more I recorded on it, the quieter and worse it got. I put it away for a few months.

    When I returned and tried it just for fun, track 1 was working just like new. I ran it for a while.

    Now, I picked it up after a few more months of inaction, and track 1 is back to its old issue. Line is good, metering is good, just having issues recording audio properly. Sound is diluted and wavy and unstable. Any and all advice would be helpful.
  2. SkywaveTDR

    SkywaveTDR Well-Known Member

    Joined:
    Feb 2014
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    From:
    Chicago area
    Gear:
    Teac, Tascam, Sony
    Could be a bad electrolytic cap or a record relay or switch contact as in some cheap devices they try and not use expensive relays. Apparently they did not use them in the 414 Mk II. I can not tell you a lot more without seeing the unit.
  3. jb544

    jb544 New Member

    Joined:
    Apr 2021
    Messages:
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    Gear:
    Tascam portastudio 414mki
    https://imgur.com/a/NGroquf

    This is what I'm looking at. Any way for me to trouble shoot the problem? Real novice but genuinely interested in learning how to service these.
  4. SkywaveTDR

    SkywaveTDR Well-Known Member

    Joined:
    Feb 2014
    Messages:
    817
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    160
    From:
    Chicago area
    Gear:
    Teac, Tascam, Sony
    Yes with a scope and a signal generator- just like a real technician will do it. You need the service manual with clear to read schematics too.