Need 12V F8T5 ballast

Discussion in 'Lighting' started by Steve, Jan 11, 2013.

  1. Steve

    Steve Guest

    Does anyone know where I could find a 12V ballast for a F8T5 fluorescent lamp? I
    have a scanner where the main board has quit powering one of the lamps.

    Thanks in advance.

    Steve
     
    Steve, Jan 11, 2013
    #1
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  2. Steve

    JB Guest

    "Steve" <> wrote in message
    news:...
    Does anyone know where I could find a 12V ballast for a F8T5 fluorescent
    lamp? I
    have a scanner where the main board has quit powering one of the lamps.

    Thanks in advance.
    >>>>>>>>>>>>>>>>>>>>>>>>>


    Pretty simple circuit to build yourself, but off the shelf inverters are
    available for caravan/camper applications from people like Invertec. Ebay is
    a good source for a cheap Chinese inverter board.

    JB
     
    JB, Jan 11, 2013
    #2
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  3. Steve

    Greegor Guest

    Is the scanner worth repairing?
    Lots of places throw those out fully working!

    Lots of places throw them out when they
    get around to it.

    On eBay they probably cost less than the shipping!
     
    Greegor, Jan 11, 2013
    #3
  4. Steve

    Robert Macy Guest

    On Jan 10, 8:13 pm, Steve <> wrote:
    > Does anyone know where I could find a 12V ballast for a F8T5 fluorescent lamp? I
    > have a scanner where the main board has quit powering one of the lamps.
    >
    > Thanks in advance.
    >
    > Steve


    I like your attitude of not throwing anything away that may still be
    made to work. If you can't find a 'dead' one that has a working
    ballast, it should be possible to repair.

    Used to design these. Contact me offline, if you want to tackle
    component level repair. Most likely the switching transistor.
    Designers tend to run these at the limits which is a timebomb for
    killing them.

    PS: I have in storage [translate to NO ACCESS] 1 target printed in
    Switzerland by the people who print money that combined with software
    [you can write] that will automatically tell you a great deal about
    these mechanical scanners - focus across the field of view,
    illumination flatness, and jitter in the mechanical feed. The cost?
    Ten sheets at $300 per sheet.You can't believe the quality of the
    printing, let alone the the stability of the 'paper' that the image is
    on.

    Plus, armed with a scope there are some simple things you can do to
    tweak the performance up to maximum.
     
    Robert Macy, Jan 12, 2013
    #4
  5. In article <>,
    Steve <> writes:
    > Does anyone know where I could find a 12V ballast for a F8T5 fluorescent =
    > lamp? I
    > have a scanner where the main board has quit powering one of the lamps.


    That's a strange choice of lamp for a scanner.
    Scanners usually use cold cathode tubes (or LEDs nowadays).

    Bare in mind that the lamp wearing out (electrode emission material
    all sputtered off) could stress the ballast and cause it to fail if
    not properly designed. So if you get a new ballast, might want to
    change the lamp too.

    --
    Andrew Gabriel
    [email address is not usable -- followup in the newsgroup]
     
    Andrew Gabriel, Jan 12, 2013
    #5
  6. Steve

    Steve Guest

    On Sat, 12 Jan 2013 14:37:24 +0000 (UTC), (Andrew
    Gabriel) put together some random words that came up with:

    >In article <>,
    > Steve <> writes:
    >> Does anyone know where I could find a 12V ballast for a F8T5 fluorescent =
    >> lamp? I
    >> have a scanner where the main board has quit powering one of the lamps.

    >
    >That's a strange choice of lamp for a scanner.
    >Scanners usually use cold cathode tubes (or LEDs nowadays).
    >
    >Bare in mind that the lamp wearing out (electrode emission material
    >all sputtered off) could stress the ballast and cause it to fail if
    >not properly designed. So if you get a new ballast, might want to
    >change the lamp too.


    The scanner is an old Hasselblad Imacon Precision II/III film scanner. The lamp
    is fixed, and the film moves around a drum as it is scanning. There is nothing
    out there that compares with the output of this scanner, and the new models are
    even better. There are a lot Precision IIs out there, and Hasselblad doesn't
    supply motherboards for these anymore. The lamps are standard Osram lamps, but
    the ballast for these is integrated on the motherboard. New models of this
    scanner sell for around $15K-$20K, so the older models are well worth saving. My
    question is for another person, as my scanner works fine, but eventually it will
    need to have electronics replaced. There is also some talk about replacing the
    entire motherboard with a modern micro board (like the Arduino), and having the
    lamps powered directly from an offline ballast.

    It looks line the CCD is connected to the motherboard via a serial link, but I
    haven't done enough investigation to know that.

    Steve
     
    Steve, Jan 12, 2013
    #6
  7. Steve

    Guest

    Followups set to sci.engr.lighting.

    In sci.engr.lighting Steve <> wrote:
    > Does anyone know where I could find a 12V ballast for a F8T5
    > fluorescent lamp?


    These guys have some, but the smallest one they list is for a single
    lamp of 15 to 22 W, bigger than the 8 W tube you have:
    http://www.powerstream.com/ballast-1.htm

    This place has them from a couple of different vendors, and they go
    down to the 8 W range you need:
    http://www.solarseller.com/12___24_...cent_ballasts__lit__light_it_technologies.htm

    Standard disclaimers apply; I don't get money or other consideration
    from any companies mentioned.

    > I have a scanner where the main board has quit powering one of the
    > lamps.


    A couple of thoughts:

    The built-in ballast may be running the lamp harder than an off-the-
    shelf ballast would to get more light, or maybe a little bit differently
    than an off-the-shelf inverter would to get a slightly different color
    from the lamp. (Other people here in sci.engr.lighting will know more
    about this second point than I do.) The test for this would be to scan
    the same photo on a working scanner and then on a scanner with the
    replacement ballast and see how well the colors match. Even if this
    happens, it might be possible to fix the color changes in software.

    The built-in ballast may have some kind of status reporting back to the
    main microcontroller, such that the scanner will refuse to work if it
    thinks the lamp is not there. The test for this is maybe to remove the
    lamp from an otherwise working scanner and try to do a scan, maybe with
    a flashlight or some other light source where the original lamp was. If
    the scanner works but produces a dark or dim picture, then OK. If the
    scanner refuses to even start, you'll have to figure out how to fool it
    into thinking that the lamp is still there.

    At the prices you cited, IMHO it's worth taking a little time to play
    with it to see if you can come up with a workable way to replace the
    built-in ballast.

    Matt Roberds
     
    , Jan 13, 2013
    #7
  8. In article <>,
    Steve <> writes:
    > On Sat, 12 Jan 2013 14:37:24 +0000 (UTC),
    > (Andrew
    > Gabriel) put together some random words that came up with:
    >
    >>In article <>,
    >> Steve <> writes:
    >>> Does anyone know where I could find a 12V ballast for a F8T5

    > fluorescent =3D
    >>> lamp? I
    >>> have a scanner where the main board has quit powering one of the

    > lamps.
    >>
    >>That's a strange choice of lamp for a scanner.
    >>Scanners usually use cold cathode tubes (or LEDs nowadays).
    >>
    >>Bare in mind that the lamp wearing out (electrode emission material
    >>all sputtered off) could stress the ballast and cause it to fail if
    >>not properly designed. So if you get a new ballast, might want to
    >>change the lamp too.

    >
    > The scanner is an old Hasselblad Imacon Precision II/III film scanner.
    > The lamp
    > is fixed, and the film moves around a drum as it is scanning. There is
    > nothing
    > out there that compares with the output of this scanner, and the new
    > models are
    > even better. There are a lot Precision IIs out there, and Hasselblad
    > doesn't
    > supply motherboards for these anymore. The lamps are standard Osram
    > lamps, but
    > the ballast for these is integrated on the motherboard.


    Another thought - assuming the scanner uses light from one side of the
    tube, make up an LED replacement tube using a length of LED strip (or
    enough separate LEDs). It will be much easier to power this from 12V.
    The challenges will be getting the light sufficiently uniform (use lots
    of small LEDs rather than a few bigger ones, and a diffusing material),
    and the spectrum, but the spectrum from an F8T5 is likely to be rather
    grotty anyway, unless they are expensive special tubes.

    > New models of
    > this
    > scanner sell for around $15K-$20K, so the older models are well worth
    > saving. My
    > question is for another person, as my scanner works fine, but eventually
    > it will
    > need to have electronics replaced. There is also some talk about
    > replacing the
    > entire motherboard with a modern micro board (like the Arduino), and
    > having the
    > lamps powered directly from an offline ballast.
    >
    > It looks line the CCD is connected to the motherboard via a serial link,
    > but I
    > haven't done enough investigation to know that.


    Raspberry Pi has a TTL serial camera interface on it.

    --
    Andrew Gabriel
    [email address is not usable -- followup in the newsgroup]
     
    Andrew Gabriel, Jan 13, 2013
    #8
  9. Steve

    Carl Ijames Guest

    If you just need one, buy a fluorescent lantern that runs on 12V and pirate
    it. For example, the Rayovac SP8DA Black Sportsman 8D Area Lantern runs on
    8 D cells and has two 9W U shaped F9W-1 bulbs. Can run either one or both,
    so it should be happy with your 8 watt bulb, and has lots of good reviews
    for quality and longevity. Under $50 at amazon, I'm sure you can find it
    cheaper. Or Makita makes a 12V trouble light, and I'm sure many others do
    to, you might even find one that uses your f8t5 bulb.

    -----
    Regards,
    Carl Ijames
    "Steve" wrote in message news:...

    On Sat, 12 Jan 2013 14:37:24 +0000 (UTC),
    (Andrew
    Gabriel) put together some random words that came up with:

    >In article <>,
    > Steve <> writes:
    >> Does anyone know where I could find a 12V ballast for a F8T5 fluorescent
    >> =
    >> lamp? I
    >> have a scanner where the main board has quit powering one of the lamps.

    >
    >That's a strange choice of lamp for a scanner.
    >Scanners usually use cold cathode tubes (or LEDs nowadays).
    >
    >Bare in mind that the lamp wearing out (electrode emission material
    >all sputtered off) could stress the ballast and cause it to fail if
    >not properly designed. So if you get a new ballast, might want to
    >change the lamp too.


    The scanner is an old Hasselblad Imacon Precision II/III film scanner. The
    lamp
    is fixed, and the film moves around a drum as it is scanning. There is
    nothing
    out there that compares with the output of this scanner, and the new models
    are
    even better. There are a lot Precision IIs out there, and Hasselblad
    doesn't
    supply motherboards for these anymore. The lamps are standard Osram lamps,
    but
    the ballast for these is integrated on the motherboard. New models of this
    scanner sell for around $15K-$20K, so the older models are well worth
    saving. My
    question is for another person, as my scanner works fine, but eventually it
    will
    need to have electronics replaced. There is also some talk about replacing
    the
    entire motherboard with a modern micro board (like the Arduino), and having
    the
    lamps powered directly from an offline ballast.

    It looks line the CCD is connected to the motherboard via a serial link, but
    I
    haven't done enough investigation to know that.

    Steve
     
    Carl Ijames, Jan 13, 2013
    #9
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