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Sony Boombox stuck in "tape" mode

Discussion in 'Electronic Repair' started by Mike S., Dec 19, 2007.

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  1. Mike S.

    Mike S. Guest

    My father-in-law asked me to look at a 2 year-old Sony boombox which he
    said suddenly "doesn't work". It has a CD player, cassette player, and
    AM/FM tuner. After playing with the controls I find that the CD player
    reads CD's and displays appropriate stuff on the LCD, and the tuner also
    tunes stations and displays the frequencies appropriately. But, in fact,
    the only audio that gets to the amplifier is that generated by the
    cassette player, regarless of what source is selected.

    The switching between CD/tuner/tape is acomplished using electronic
    pusbuttons. So you can select CD, and the CD spins, but the audio
    that is routed to the amplifier is actually the cassette player.
    The cassette player is controlled using old-technology spring-loaded keys.

    So the thing is stuck in "tape" mode, even though the logic behind the
    electronic controls think that the CD or radio is actually selected.
    I'm still convinced that there is a mechanical switch or sensor that
    became stuck somewhere when they last used the cassette player. How to
    troubleshoot without schematic?
     
  2. So the thing is stuck in "tape" mode, even though the logic behind the
    My guess is that there's an electronic switch (which is cheaper and simpler
    than mechanical switches) that selects among the various sources. The switch
    is probably blown, jammed at cassette.

    You might try this... With the unit turned on, yank the batteries. This
    might reset the unit.
     
  3. Ron(UK)

    Ron(UK) Guest

    There may be a correct way to reset the micro - if that is indeed what`s
    stuck - Usually a combination of key presses at powerup. A model
    number would help?

    Ron(UK)
     
  4. What I'm suggesting is "generic". I call it "CMOS lockup". I've seen it in
    other products, including my NAD MR-20 monitor and a Pioneer LD player.
    "Yanking the cord" while the power is on fixes it.
     
  5. Mike S.

    Mike S. Guest


    Thanks; should have mentioned that I thought of that. It has never had
    batteries inside; runs exclusively on the AC cord and it had been
    unplugged for days.
     
  6. Mike S.

    Mike S. Guest

    Yep, sorry. It's a CFD-F10.
     
  7. Mike S.

    Mike S. Guest

    Will give that a try.
     
  8. Mike S.

    Mike S. Guest

    OK. I've tried yanking the cord while the unit was running in CD, tuner,
    and tape modes (with and without the tape mechanism engaged via the piano
    keys). Unfortunately, no help. In each case, the unit powers up afterwards
    in CD mode, but with audio still routed only from the tape player.
     
  9. Then I would guess you have a blown switching chip.
     
  10. Mike S.

    Mike S. Guest

    Feared that would be the case. Anyway, appreciate the suggestions.
     
  11. b

    b Guest

    open the unit and desolder the function select push switch. you never
    know, a drop of liquid or deformed plastic may have it permanently
    'on'.
     
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