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Fred,
We had the same problem and traced it to the resistor. We can try the ZAP
mode, but for future reference we would like to know the value you used to
replace the 47 Ohm 1/2 watt resistor. Any chance we could get that information?
Thanks,
Dan
In lugnet.robotics.handyboard, Fred G. Martin writes:
> When the batteries are really run down, they can draw too much
> current through the on-board charging circuit. (I'm assuming you
> are plugging adapters directly to the HBs, rather than going
> through the serial interface/phone line charge ckt.)
>
> About 6 mo's ago I upped the value of the charge limiting resistor
> on the HB to help deal with this.
>
> For older boards, I suggest that you charge with the separate
> interface/charger board, in normal mode.
>
> If you have time, use Zap mode for a few minutes to get the cells
> out of deep discharge, then switch to normal mode or even back to
> the direct-adapter charging.
>
> Fred
>
>
>
> On Tuesday, September 3, 2002, at 04:21 PM, Joe Kopena wrote:
>
> > I have a collection of HandyBoards I'm trying to prepare for class
> > this fall.
> > They're a few years old now and have seem some fairly heavy use.
> > I'm having
> > trouble charging them and am hoping there's a component to replace
> > or something
> > I can fix to bring them back to life.
> >
> > The basic problem is: when I plug them into a charger (including
> > chargers which
> > work fine with other boards), I get a strong burning smell in the
> > room almost
> > immediately. Also, the charging LED glows bright organge instead
> > of yellow. I
> > don't know that I have a strong enough electronics background to
> > really work on
> > the problem, so I'm hoping this is clearly indicative of a
> > particular burnt out
> > component or something like that which someone can point out to me.
> >
> > Thanks!
> >
> > --
> > - joe kopena
> >
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Message is in Reply To:
 | | Re: Over Charging
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| When the batteries are really run down, they can draw too much current through the on-board charging circuit. (I'm assuming you are plugging adapters directly to the HBs, rather than going through the serial interface/phone line charge ckt.) About 6 (...) (22 years ago, 3-Sep-02, to lugnet.robotics.handyboard)
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