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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 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 has 1 Reply:
 | | Re: Over Charging
|
| 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 (...) (22 years ago, 11-Sep-02, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Over Charging
|
| 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 (...) (22 years ago, 3-Sep-02, to lugnet.robotics.handyboard)
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