Positive or negative tip: how to tell?

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

  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?
    nobobo, Dec 3, 2004
    #1
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  2. nobobo

    Bob Myers Guest

    "nobobo" <> wrote in message
    news:...

    > 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.


    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.

    >
    > 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?
    Bob Myers, Dec 4, 2004
    #2
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  3. nobobo

    Ban Guest

    nobobo wrote:
    > 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?


    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.
    --
    ciao Ban
    Bordighera, Italy
    Ban, Dec 4, 2004
    #3
  4. nobobo

    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.

    Mike

    "Ban" <> wrote in message
    news:lQasd.455226$...
    > nobobo wrote:
    > > 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?

    >
    > 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.
    > --
    > ciao Ban
    > Bordighera, Italy
    >
    >
    Mike, Dec 4, 2004
    #4
  5. nobobo

    Ban Guest

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


    Read again what I wrote and do not confuse the original poster please.
    Ban
    Ban, Dec 4, 2004
    #5
  6. nobobo

    John Fields Guest

    On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <> wrote:

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

    >
    >Read again what I wrote and do not confuse the original poster please.
    >Ban


    ---
    It would probably have confused the original poster less (and possibly
    prevented him from damaging his meter or blowing a fuse, or
    whatever...) if you'd have advised him to remove the batteries before
    doing any continuity testing, don't you think?

    --
    John Fields
    John Fields, Dec 4, 2004
    #6
  7. nobobo

    Ban Guest

    John Fields wrote:
    > On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <> wrote:
    >
    >> Mike wrote:
    >>> Don't connect the meter when set to measure ohms to a power source!
    >>> Make sure you're measuring volts instead of ohms.
    >>>
    >>> Mike

    >>
    >> Read again what I wrote and do not confuse the original poster
    >> please. Ban

    >
    > ---
    > It would probably have confused the original poster less (and possibly
    > prevented him from damaging his meter or blowing a fuse, or
    > whatever...) if you'd have advised him to remove the batteries before
    > doing any continuity testing, don't you think?


    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?

    --
    ciao Ban
    Bordighera, Italy
    Ban, Dec 4, 2004
    #7
  8. nobobo

    John Fields Guest

    On Sat, 04 Dec 2004 15:52:29 GMT, "Ban" <> wrote:

    >John Fields wrote:
    >> On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <> wrote:
    >>
    >>> Mike wrote:
    >>>> Don't connect the meter when set to measure ohms to a power source!
    >>>> Make sure you're measuring volts instead of ohms.
    >>>>
    >>>> Mike
    >>>
    >>> Read again what I wrote and do not confuse the original poster
    >>> please. Ban

    >>
    >> ---
    >> It would probably have confused the original poster less (and possibly
    >> prevented him from damaging his meter or blowing a fuse, or
    >> whatever...) if you'd have advised him to remove the batteries before
    >> doing any continuity testing, don't you think?

    >
    >How can you reach the terminal with the batteries inside?


    ---
    How do you know he can't? Usually it's pretty easy, you just stick
    the probe in there.
    ---

    > And I want to see the guy that has working batteries in a years-old gadget?


    ---
    See "Me-JF.tif" on abse. ;)

    --
    John Fields
    John Fields, Dec 4, 2004
    #8
  9. nobobo

    DAW Guest

    Idiots, both of you.
    "John Fields" <> wrote in message
    news:...
    > On Sat, 04 Dec 2004 15:52:29 GMT, "Ban" <> wrote:
    >
    >>John Fields wrote:
    >>> On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <> wrote:
    >>>
    >>>> Mike wrote:
    >>>>> Don't connect the meter when set to measure ohms to a power source!
    >>>>> Make sure you're measuring volts instead of ohms.
    >>>>>
    >>>>> Mike
    >>>>
    >>>> Read again what I wrote and do not confuse the original poster
    >>>> please. Ban
    >>>
    >>> ---
    >>> It would probably have confused the original poster less (and possibly
    >>> prevented him from damaging his meter or blowing a fuse, or
    >>> whatever...) if you'd have advised him to remove the batteries before
    >>> doing any continuity testing, don't you think?

    >>
    >>How can you reach the terminal with the batteries inside?

    >
    > ---
    > How do you know he can't? Usually it's pretty easy, you just stick
    > the probe in there.
    > ---
    >
    >> And I want to see the guy that has working batteries in a years-old
    >> gadget?

    >
    > ---
    > See "Me-JF.tif" on abse. ;)
    >
    > --
    > John Fields
    DAW, Dec 5, 2004
    #9
  10. nobobo

    John Fields Guest

    On Sat, 4 Dec 2004 19:57:53 -0500, "DAW" <> wrote:

    >Idiots, both of you.


    ---
    Ha,ha, you're wrong.
    Ban isn't an idiot.
    ---

    >"John Fields" <> wrote in message
    >news:...
    >> On Sat, 04 Dec 2004 15:52:29 GMT, "Ban" <> wrote:
    >>
    >>>John Fields wrote:
    >>>> On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <> wrote:
    >>>>
    >>>>> Mike wrote:
    >>>>>> Don't connect the meter when set to measure ohms to a power source!
    >>>>>> Make sure you're measuring volts instead of ohms.
    >>>>>>
    >>>>>> Mike
    >>>>>
    >>>>> Read again what I wrote and do not confuse the original poster
    >>>>> please. Ban
    >>>>
    >>>> ---
    >>>> It would probably have confused the original poster less (and possibly
    >>>> prevented him from damaging his meter or blowing a fuse, or
    >>>> whatever...) if you'd have advised him to remove the batteries before
    >>>> doing any continuity testing, don't you think?
    >>>
    >>>How can you reach the terminal with the batteries inside?

    >>
    >> ---
    >> How do you know he can't? Usually it's pretty easy, you just stick
    >> the probe in there.
    >> ---
    >>
    >>> And I want to see the guy that has working batteries in a years-old
    >>> gadget?

    >>
    >> ---
    >> See "Me-JF.tif" on abse. ;)
    >>
    >> --
    >> John Fields

    >


    --
    John Fields
    John Fields, Dec 5, 2004
    #10
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