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electric fence , force field B20, 2007

Discussion in 'Electronic Repair' started by N_Cook, Jun 29, 2010.

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  1. N_Cook

    N_Cook Guest

    8 pin SMD with blown hole in the casing. Top mark , very indistinct maybe 2
    lines
    0h963
    0h37

    maybe very stylised 4 instead of h, logo very indistinct. My first guess is
    a 555 but pinning not standard
    p3 ground, p8 +12V, pin 1 to a 10uF cap , other end to 0V, p5 tied to p6
    goes to speed change pot with also a line from the pot to p1. No obvious
    output trace.
    Removed the device and internal connections between p2 and 3 presumably
    fried , and also p6 and 7
    Other device is a 16 pin with ident scraped off or the conformal coating
    dissolved off.

    In passing , a 8x5x3 mm fuse with bo encapsulation , mainly 2 bare Al plates
    with something between. Working order measures 0.18R +/-.01R, marked/punched
    in the Al
    100
    B7L
    never seen anything like it before
    make/series/value?
     
  2. N_Cook

    N_Cook Guest

    The fuse is surface mount , I suppose as high current draw, if only
    intermittant ,it has to be quite high current, perhaps 10 amp from the 100
    marking. Top face 8x5mm bent down the 3 mm over the other plate to one pad
    and the other smaller plate , about 6x45mm to the other pad and some thin
    material in between
     
  3. N_Cook

    N_Cook Guest

    The fuse is surface mount , I suppose as high current draw, if only
    intermittant ,it has to be quite high current, perhaps 10 amp from the 100
    marking. Top face 8x5mm bent down the 3 mm over the other plate to one pad
    and the other smaller plate , about 6x45mm to the other pad and some thin
    material in between
    of this form, polyswitch
    http://www.westfloridacomponents.com/IC523PE05/40A+15V+1.9W+Resettable+SMT+P
    olyswitch+Fuse+Tyco+SMD250-2.html
    perhaps 10 amp version
     
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