Subject:
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RE: Smoking serial/charger board...!!!
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 25 Jul 1997 13:40:01 GMT
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Original-From:
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German Gentile <ggentile@cvtci.com.arIHATESPAM>
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Viewed:
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1285 times
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Ihave this problem, the reason be a capacitor in short randomly. Touch
every cap., and search any hot , that is the very fast way to discover :)))
!!!! Then unsolder any pin of this cap and search again. So probably the 5
volts at the out of 7805 go down randomly. When you find the cap it not
happen again.
Sorry for my english.
German Gentile
ggentile@cvtci.com.ar
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> De: Fred G. Martin <fredm@media.mit.edu>
> A: Romklau Nagamati <nagamati@netcom.com>
> CC: handyboard@media.mit.edu
> Asunto: Re: Smoking serial/charger board...!!!
> Fecha: Jueves 24 de Julio de 1997 09:52
>
> make sure you have a telephone-style and not network-style RJ11 cable.
>
> Here is how you tell if you have a telephone-style or network-style
> RJ11 cable. Hold the two ends together, metal contact side up, as if
> you were trying to plug them into each other.
>
> Then look at the wiring colors. On a telephone cable, each color
> should line up with itself on the other end.
>
> On a network cable, the colors are inverted.
>
> See the diagrams for clarification. Again, please, please, PLEASE!
> be careful about this and do not use network cables with your Handy
> Board.
>
> -Fred
>
>
> TELEPHONE STYLE WIRING
> +---------------+ +---------------+
> --------+ yellow =======+ +======= yellow +--------
> + green =======+ +======= green +
> + red =======+ +======= red +
> --------+ black =======+ +======= black +--------
> +---------------+ +---------------+
>
> NETWORK STYLE WIRING
> +---------------+ +---------------+
> --------+ yellow =======+ +======= black +--------
> + green =======+ +======= red +
> + red =======+ +======= green +
> --------+ black =======+ +======= yellow +--------
> +---------------+ +---------------+
>
>
>
>
> In your message you said:
> >
> > Well,
> >
> > Today I dig up my handyboard which was working fine with the • serial/sharger
> > board and all the last time I used it a few months ago.
> >
> > After a fresh overnight NiCd charge using the onboad power connector
> > (i.e. not using the serial/charger board), I thought I would play with
> > it a bit. That's when the fun started...
> >
> > Upon plugging in the telephone cord between the handyboard and • serial/charger
> > board, R11 started to turn darker and literally started smoking... By • the tim
> e
> > I got around to disconnecting the cord, R12 and LED14 have started to • do the
> > same. I guess that R11(47 Ohms 1/2W) burnt out causing a domino effect • on
> > R12(47 Ohms 1/8W)...
> >
> > My question is, does anyone know why it's doing this? Right before I • shelfed
> > it couple month ago, I made the modification for using less than 9.6V • motor
> > (per instruction on the handyboard homepage). But, all was working fine
> > after that (at least I thought so)... I should mention that the two • motor
> > driver sockets are empty because I'm still waiting for my TI 754410 • (and
> > have been for 2 months)...
> >
> > I have just replaced R11 & R12 and I thought I should ask before I try
> > again... Any clue would be appreciated... Voltage across pin 3 & 4 of • the
> > modular socket on the handyboard read 10.2V. The charge rate switch was
> > at normal.
> >
> > TNX
> >
> > --Ron
> >
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