[NTLK] Newton 2100 on batteries only freeze with ATA or 3rd party linear cards

[Elias Basse]

My suggestion would be to test the tantalum surface mount capacitors with a capacitance multimeter and verify against the values written on the cases (it appears that there are four on the right and one on the left).

I have had capacitor issues when a circuit board is stored in non ideal temperatures and have had to replace them.  While surface mount capacitors are difficult to solder, they are replaceable and inexpensive (30-50 cents is average) I stick with name brands like nichicon or tyco.

It appears that they are 100uf variety (yellow component).

Best Regards,
Elias

Sent from my iPhone

> On Jul 26, 2018, at 7:44 AM, Sylvain Pilet <sylvain at pilet.net> wrote:
> 
> Vladislav,
> 
> It may be that, but who knows where this capacitor is?
> Below, a capture of the motherboard of an MP2000 (source image: ifixit).
> 
> http://message-pad.net/Download/Documents/Newton-Doc-Spec/Source-iFixit/MP2000BOARD-iFixit1.jpg
> http://message-pad.net/Download/Documents/Newton-Doc-Spec/Source-iFixit/MP2000BOARD-iFixit2.jpg
> 
> 
> 
> Sylvain Pilet
> 
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>> Le 26 juil. 2018 à 13:42, Vladislav Korotnev <vladkorotnev at gmail.com> a écrit :
>> 
>> Only one slot, only on batteries, only non standard cards and intermittent behavior? Sounds like a degrading capacitor issue to me IMO
>> 
>> // Ak.R.
>> 
>> iOS/Mac/Windows & Web developer
>> Vaporwave/ambient producer, sound/video engineer
>> 
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>> 
>> Sent from my iPhone
>> 
>>> On 26 Jul 2018, at 17:45, Piotrowski Paweł (Newton) <newton at indigi.co.uk> wrote:
>>> 
>>> I thin I just ruined my Newton ;(
>>> 
>>> This problem occurs on upper pcmcia slot only.
>>> 
>>> 
>>> 
>>>> On 26 Jul 2018, at 11:31, Piotrowski Paweł (Newton) <newton at indigi.co.uk> wrote:
>>>> 
>>>> Hi Newtons,
>>>> 
>>>> I play a little with one of my Newtons 2100. What I discover today is that if I work on AA batteries only (new ones, indicator shows me 90%), and I try use ATA memory cards or non-Apple linear memory cards (in this case was 20MB card), my Newton just freeze very bad. Even reset button is not working. The only option is to remove batteries.
>>>> 
>>>> What is interesting:
>>>> 
>>>> - when I use power adapter, all cards working fine
>>>> - this problem is with memory cards only - WiFi card working fine on batteries only
>>>> - I thought that ATA driver making problem, but no. Newton have freezing problem on batteries even after total wipeout (power+reset and erase all data procedure)
>>>> 
>>>> Any ideas and conclusions? I’m asking, because I could understand ATA card causing problems. But linear cards?
>>>> 
>>>> 
>>>> 
>>>> 
>>>> Best regards,
>>>> Pawel Piotrowski
>>>> 
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