Sony TC-136SD VU meters randomly move and cant play music

Discussion in 'Tech talk' started by MissionTroll, Sep 20, 2020.

  1. MissionTroll

    MissionTroll Member

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    I uploaded video of it. I changed the belts so mechanism works fine but I dont get any sound from it. VU meters randomly move and player makes weird noises. Recording mode seems fine but I coudn't test it since I dont have a microphone. Is the tape head broken?
     
  2. Mister X

    Mister X Moderator Staff Member

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    It could be a few things but I'd pull it back apart and look at the wiring to the play head and make sure they're all connected and not broken. You don't need a mic to test record unless you don't have a source with output jacks.
     
  3. stuck-in-time

    stuck-in-time Well-Known Member

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    Have you cleaned the rec/play switches?
     
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  4. MissionTroll

    MissionTroll Member

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    Hi do you mean the mechanical play switch at the bottom of the cassette player
     
  5. stuck-in-time

    stuck-in-time Well-Known Member

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    No, there's an internal mechanical switch that controls whether the deck is in play or record mode. Over time, these get dirty or oxidized and should be cleaned. In many cases, cleaning it is like a "miracle fix" that brings silent or erractic sounding units back to life.

    You can see the switches here on the 4th image. There is a pair of long metal boxes with a sliding plastic inner piece. These are mechanically moved by a lever when you press record. Try spraying some contact cleaner and sliding it back and forth several times.
     
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  6. MissionTroll

    MissionTroll Member

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    I cleaned the contact and it started working. Only problem left is thevolume sliders doesnt effect volume which is weird.
     
    Last edited: Sep 21, 2020
  7. MissionTroll

    MissionTroll Member

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    Maybe the AUX out doen't get affected by volume sliders. Can I connect a speaker to the front speaker jack. BTW how can I adapt that front jack to 3.5mm jack. Is it possible to use normal headphones with this.
     
  8. stuck-in-time

    stuck-in-time Well-Known Member

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    I checked again an the sliders are labeled "Mic" & "Line" so I think they're both rec level sliders. They wouldn't affect playback volume.

    Yes. You can plug in a normal headphone. If it uses 3.5 mm jack, just use an adapter. Though you can't adjust the volumes.
     
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  9. MissionTroll

    MissionTroll Member

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    Hi, today I bought the adapter cables I needed. So I connected my phone to the line in. I recorded to an old tape I didn't cared. VU meters were moving and I was listening the recorded music at the same time so it was undeniably recording. When I tried to listen back what I recorded it was complete silence. The erase head definitely deleted old sound on cassette but nothing recorded. I tried with different settings but still nothing :(
     
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  10. Mister X

    Mister X Moderator Staff Member

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    How did you hook up the AUX out? You probably need to go through an amplifier to get sound.
     
  11. SONY-BOY

    SONY-BOY Member

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    A quick tip...
    To test if a recording circuit is working, just plug into the MIC IN socket(s) a pair of headphones and speak into them.

    A 'Tape/Cassette Deck' is very likely to have built-in amplfying circuits if it has been fitted with AUX IN socket(s). If not then a sepaerate stand alone amplifier will need to be used for playing other source material into a tape/cassette deck through the LINE IN socket(s).

    Transportable tape decks (R-R and Cassette) do have built in amps because they are supplied with clip-on/off speaker units.

    Some very basic tape recording units (mostly cassette based) only have a MIC IN socket which is a problem for those wanting to record other source material onto that unit. You can go into the MIC IN socket but only once you have significantly reduced the sound level output of the source material and to do this you will have to run the source through a stand alone amplifier using the AUX IN or LINE IN sockets BUT NEVER THE PHONO IN!!
     

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