Hitachi TRK-3D7 boombox - new owner, help needed

Discussion in 'Tech talk' started by Gregor, Jul 16, 2018.

  1. Gregor

    Gregor New Member

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    Hi, I finally got to be able purchace my long-time favorite boombox which brings me back to my teens. I was all so happy to see it has a line-in possibility but so frustrated I can't find a way to make use of it. As I know there's bound to be some Hitachi gurus here I'm hoping someone will help.

    I would also be very gratefull if there is a pdf of a user manual I could get ahold of. Thanks in advance.
     

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  2. Northerner

    Northerner Well-Known Member

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    You need to press record on the tape deck for line in to work :)
     
  3. Gregor

    Gregor New Member

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    Is there a way around the cassete player to run? Is it possible to mount a switch that simulates it? Anybody done that? If possible in a way it can be reversed if I wanted it back to original. Thanks
     
  4. lupogtiboy

    lupogtiboy Well-Known Member

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    Is the line in a white and red rca?
     
  5. Mister X

    Mister X Moderator Staff Member

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  6. Northerner

    Northerner Well-Known Member

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    Yeh that was my mint boxed 3D7 in that thread :)
     
  7. Gregor

    Gregor New Member

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    The line-in looks like this:

    3d7-6.jpg

    I'll contact the "collector", to see if he can help.
     
  8. lupogtiboy

    lupogtiboy Well-Known Member

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    Then all you need is this

    [​IMG]

    And plug whatever you want into the headphone socket, ie. phone, ipod, cd player and so on
     
  9. Gregor

    Gregor New Member

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    Thanks, but it's not what my problem is - I know how to get the signal to the device but how to get the 3D7 to play this signal without the casette player to run in a recording mode - thats another challenge. So I'd like to find a solution which will trick the player to think it is in a tape recording mode but without motor running.
     
    Last edited: Jul 17, 2018
  10. lupogtiboy

    lupogtiboy Well-Known Member

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    It must have a position on the function switch that selects the line in? Usually in the order of

    'radio' 'tape/radio off' 'line in'
     
  11. lupogtiboy

    lupogtiboy Well-Known Member

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  12. isolator42

    isolator42 Active Member

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    I had a 3D7 from new in the 80s (for the money, it was hard to beat for volume & bass wallop, being one of the earliest 'extra bass' boomers) & I still have it. As has been explained, unfortunately, there isn't a simple way to use aux in, something Hitachi rectified on the 3D8.
    This wasn't much of a problem when the cassette was king in the 80s, but when I rekindled my boombox interest in this century, I bought a Digisette cassette-shaped mp3 player, which sounded great, especially as the deck was all but worn out.
    These days a Bluetooth-Cassette-Adapter is probably more useful.

    Hope you get booming with it soon :)
     
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  13. felix_f4

    felix_f4 New Member

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    Line input, requires you to press the button to record,
    Other functions can follow the user interface...and I really like this machine.
     
  14. Mister X

    Mister X Moderator Staff Member

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    I actually bought a toasted one last year, it's on the bench, I started going through the wiring and everything is getting voltage but for some reason it's still not turning on. There's not a lot on the inside but they're so cool looking.
     

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