Porta 07 fried

Discussion in 'TASCAM DIY Repairs and Mods' started by silki, Mar 12, 2018.

  1. silki

    silki New Member

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    Gear:
    Portastudio 07
    Ijut bought this porta 07 for 20bucks, looks like its been trough some rough time but stilll wanna get it to work. Can someone identify this D602 diode? also, what could i put in place of Q604 transistor it says c1815 on it but cant find viable replacment.
    Second problem is that tape deck, it grinds when i press play with the cassete and pulls the tape out of the cartrige but without one it spins normal, also ffwd frwd works okay..id say its the spring around that metal pole but not sure, belts are okay. IMG_20180312_180144.jpg IMG_20180312_180159.jpg IMG_20180312_180127.jpg
  2. Lachlan Webster

    Lachlan Webster New Member

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    US-144
    How funny. I am in a similar predicament, having bought this last year.

    I have an audio out issue.

    Could you please share with me how you got the case open on yours?

    This is my first time opening anything up.
  3. silki

    silki New Member

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    Portastudio 07
    What I have found out is that its been messed up by polarity inversion, which means opamps are fryed too and should be replaced..
    Unscrew bottom screws and the one in the deck itself at the front and it should just split in two...
    Let me know if u managed to fix it
  4. Lachlan Webster

    Lachlan Webster New Member

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    US-144
    Hey,

    Yes, I came across a video about polarity inversion, too.

    It was on a porta 02, but the fella seems to think that all that may be required is capacitor replacement.

    I've about 6 capacitors that are noticeably blown on mine. Have ordered replacements. If that doesn't work it's off to the technological graveyard.

    Here's the video if interested:
  5. silki

    silki New Member

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    Portastudio 07
    Yeah, I ve seen that but i truly doubt thats tha case, as there is a thread here about porta 07 where a guy said he repaired numerous cases where polarity was inverted and said that opamps are out almost always.. Found them on ebay $3, so im planing to restore it
  6. SkywaveTDR

    SkywaveTDR Member

    Joined:
    Feb 2014
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    From:
    Chicago area
    Gear:
    Teac, Tascam, Sony
    These units that have gloom and doom care are repairable but the cost can get high due to the hours it takes. How do you know the Op Amps are blown? Did you measure each one with a meter? Just put sockets in and replace them it is not all that bad. In all my years I have seen mechanical problem bad motors and broken solder joints but never a burned up part like that. There was a lot of abuse done to that machine. Maybe the damage ends just at the regulator area?