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Positive or negative tip: how to tell?

Discussion in 'Electronic Basics' started by nobobo, Dec 3, 2004.

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  1. nobobo

    nobobo Guest

    I have an old Sanyo cassette recorder, model M 1540A. Can find no
    information on what polarity of tip it uses. Only know that it's 6.0
    Volt. No markings on outside of case to show what it is. Sanyo website
    and customer service has no information and websearches come up empty.

    I have opened the unit. It takes 4 "C" cell batteries. The circuit
    board is old and isn't labeled. I can't tell how the AC adaptor jack
    is wired to the board. A label on the outside says to use AC Adaptor
    6CV120 or 6CV121.

    I have two adaptors I am considering using with it, both positive tip.
    One is a class 2 transformer that outputs 6V DC and 300mA. The other
    (much bigger)is labeled AC Adaptor and outputs 6V DC and 2000mA.

    Any ideas?
  2. Bob Myers

    Bob Myers Guest

    Check to see which end of the battery stack connects
    to the PCB "ground" or common (generally, this will
    be fairly easy to find on the PCB). The "tip" will
    almost certainly be the OTHER end.

    Bob M.
  3. Ban

    Ban Guest

    With your ohmmeter put one side to the battery negative connection and check
    out which of the adaptors poles has continuity with it (possibly the
    outside). Then you can insert the plug without modifications. You can then
    try either supply.
  4. Mike

    Mike Guest

    Don't connect the meter when set to measure ohms to a power source! Make
    sure you're measuring volts instead of ohms.

  5. Ban

    Ban Guest

    Read again what I wrote and do not confuse the original poster please.
  6. John Fields

    John Fields Guest

  7. Ban

    Ban Guest

    How can you reach the terminal with the batteries inside? And I want to see
    the guy that has working batteries in a years-old gadget?
  8. John Fields

    John Fields Guest

  9. DAW

    DAW Guest

    Idiots, both of you.
  10. John Fields

    John Fields Guest

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