From: Andrés Galluzzi (agalluzzi_at_gmx.net)
Date: Sat Jun 19 2004 - 08:27:51 PDT
I reply here, because my problem was with the power adapter. I've connect my
Newton 2K to a power supply that was NOT regulated (also, later I've checked
it have not the 7.5V that says in the label, but 12V) and after that, I
can't make my Newton work again. It makes as if it starts again, also the
"erase all" question shows up, and I can make it erase everything (I've make
a soft-hardware and also a hard restart on it), but outside that, no
operating system starts and every time it shows up the Newton logo as for
starting, it stays for less than a second and makes off.
Does anybody know if this situation is reversible? Is there a component that
can be change to make the Newton work again?
Thanks in advance.
Andy.
-----Mensaje original-----
De: newtontalk-bounce_at_newtontalk.net
[mailto:newtontalk-bounce_at_newtontalk.net] En nombre de Johannes Wolf
Enviado el: Miércoles, 16 de Junio de 2004 05:45 a.m.
Para: newtontalk_at_newtontalk.net
Asunto: Re: [NTLK] After-market power adapter
PLEASE CHECK BEFORE PLUGGING IT TO YOUR NEWT!!
From my own experience I can tell you that it is really bad when you realise
a bed smell coming out of your Newt and the display switches off forever...
It is a very easy thing to to - take a multimeter and measure the output
voltage of your adapter.
The most important thing is to check that the voltage in no load condition
does not exceed 7.5 V!
If this is the case the risk to damage your Newt is much lower but still not
zero.
The remaining risk is that the power adapter may provide too much current
and/or a different impedance curve.
If you have a look at the power adapter designers guide (available at Unna)
you get a clear description on how the power adapters output voltage shall
behave with respect to output current. The main thing is that there is a
current limitation (may be even with fold back characteristics) that limit
the current to a total maximum of 1.3 Amps.
In case this maximum current is exceeded (this can hapen only during the
fast charging of the Newton battery) you also risk to damage your Newt.
The best way to find this out is to measure the voltage/current
characteristics of the adapter.
But a current measurement while applying a short to the output will do as
well - the max. current shall be 1.3 Amps or below.
Cheers
Johannes
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