Waking up your computers

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NikolaL
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Waking up your computers

Postby NikolaL » Wed Mar 25, 2015 8:40 pm

In a time maybe a year, your not using your old computer. Capacitatiros and small capacitators, whole sistem draw more power in first boot !
These capacitators are now in refresh stage. At first power up your computer, computer power supply unit give alot more amperes to sustain voltage to drive sleepy capacitators. Probably you got hardware errors, then you may panic and ask your self "what is wrong with my computer??fwt!"

I say dont panic. You want to have low internal resistance right now and full capacity.
Now, Here is solution in stages to fully wake up capacitators.

1. First power up, you leave it running 1 minute, and turn it off, leave it off for 3 minutes to completly dischardge capacitators.(If you leave it running there is chanche caps may heat up, and leak out, and lose capacity)
2. Fire up you computer, leave it running for 3 minutes, and turn it off, leave off swich for 3 minutes.
3. Turn up your computer, leave it runing 10 minutes, and turn it off, leave it off for 2 minutes.
Now you done allmost 70%, in time you swich ON and OFF alot. First 3, power up and power downs are important, dont panic.

These cycles makes your capacitators doing full tasks, chardge and dischardge. And minutes are for Fully chardget and Fully dischardges time periots.

While your using your computer you doing power ON OFF cycles alot and your capacitators power drawn reduced by alot or maximum.
Last edited by NikolaL on Thu Mar 26, 2015 6:45 am, edited 1 time in total.
Place for 5 volts, atleast 1000uF 6.3V or 16V capacitator into board at your psu power plug :wink:

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paul92706
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Re: Waking up your computers

Postby paul92706 » Wed Mar 25, 2015 9:37 pm

very useful information thank you nik!
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Re: Waking up your computers

Postby exxos » Wed Mar 25, 2015 10:13 pm

If capacitors failing that bad, then they should be changed. Capacitors dry out over 30+ years, they cannot be "fixed". Capacitors will change values from cold to hot. It might be enough to get some PSU's working very briefly but that is all.

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Re: Waking up your computers

Postby paul92706 » Wed Mar 25, 2015 10:38 pm

exxos wrote:If capacitors failing that bad, then they should be changed. Capacitors dry out over 30+ years, they cannot be "fixed". Capacitors will change values from cold to hot. It might be enough to get some PSU's working very briefly but that is all.

In case you have not seen my PSU pages...

http://www.exxoshost.co.uk/atari/last/psu/index.htm

could that be a quick temporary fix though? but i strongly agree with you, there's no "If's/And's/But's" capacitors do need changing for sure!
'"
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exxos
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Re: Waking up your computers

Postby exxos » Wed Mar 25, 2015 11:09 pm

paul92706 wrote:
exxos wrote:If capacitors failing that bad, then they should be changed. Capacitors dry out over 30+ years, they cannot be "fixed". Capacitors will change values from cold to hot. It might be enough to get some PSU's working very briefly but that is all.

In case you have not seen my PSU pages...

http://www.exxoshost.co.uk/atari/last/psu/index.htm

could that be a quick temporary fix though? but i strongly agree with you, there's no "If's/And's/But's" capacitors do need changing for sure!
'"



I would imagine leaving the caps to cool down would be a better option. Once they start to heat up, its when their value starts to change and things get worse. I wouldn't advise repeatedly turning on/off a PSU which has bad caps though. I have seen caps explode due to turn on surges on dried out caps.

I used to repair switchmodes in my old job (among many other things). Those Atari PSU's seem pretty nice really overall. Though some I have repaired in the past can turn out to be pretty nasty indeed. Some I worked on were just pure evil.. It got to the point of running a 100watt lamp in series with the mains lead as a current limiter, plus switching the things on with a heavy book on top.. from the other side of the workshop... :lol:

The Atari ones don't seem to fail in a huge way. If the transistor shorts, at least the thing doesn't explode like many designs I have worked on do. I think I had a couple rectifiers explode years ago. Those things tend to bulge when they are stressed. I never was a big fan of those small round ones anyway. Overheat to easy being a small package. Caps do not do well being right next to heatinks which get hot.. just my 2c worth... :)
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Re: Waking up your computers

Postby NikolaL » Thu Mar 26, 2015 12:40 am

TANTAL capacitators got no internal resistance at any age.

Elco, that is ment as basic elecrolyte capacitators, for electronic capacitators got internal resistance bigger on capacitate number and count.(not accumulators!) Refreshing those fix all, if you wish to save money and your computer :)
Place for 5 volts, atleast 1000uF 6.3V or 16V capacitator into board at your psu power plug :wink:

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Re: Waking up your computers

Postby AtariZoll » Thu Mar 26, 2015 7:40 am

I worked over 25 years in servicing diverse electronic devices, including home computers.
Described procedure may help little - in rare cases, maybe couple % of cases, and only temporary. But all that power on/off is potential danger for old computers. If our Ataris would be younger - about 10 years, and not average 25 years age, it could be useful. Replacing capacitors is now almost mandatory - even if machine work without problems.
Electrolyte capacitors simply have limited life time, and they lose capacity during work. Tantal ones are better, but you will hardly see such in old micros.

Just to note that in switching power supplies lifetime is usually shorter - high frequency causes bigger heating, so shorter lifetime. Especially in newer PC motherboard CPU power regulators, where freq is often over 100 KHz.
As others pointed too, with old Ataris, PSU is where replacing electrolyte caps is needed in most cases.
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Re: Waking up your computers

Postby exxos » Thu Mar 26, 2015 8:31 am

I was never fond of tantalum caps. I tried using them once about 20 years ago in place of electrolytics and they just set on fire ?! I never used them again.
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Re: Waking up your computers

Postby NikolaL » Thu Mar 26, 2015 10:27 am

Tantal capacitators they are sensitive on max voltage too may die instantly too when swiching + or - pins.
Tantalum caps are used every where in need in modern electronic too. Is good to use them in solar calculators :) and small divices too.
Place for 5 volts, atleast 1000uF 6.3V or 16V capacitator into board at your psu power plug :wink:

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Re: Waking up your computers

Postby exxos » Thu Mar 26, 2015 11:45 am

NikolaL wrote:Tantal capacitators they are sensitive on max voltage too may die instantly too when swiching + or - pins.
Tantalum caps are used every where in need in modern electronic too. Is good to use them in solar calculators :) and small divices too.


I can't remember what I used them in, was probably just a basic regulator circuit or something. These days with caps a lot smaller and 10uF+ in SMT form, more spoiled for choice :)
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Re: Waking up your computers

Postby paul92706 » Thu Mar 26, 2015 3:40 pm

exxos wrote:
NikolaL wrote:Tantal capacitators they are sensitive on max voltage too may die instantly too when swiching + or - pins.
Tantalum caps are used every where in need in modern electronic too. Is good to use them in solar calculators :) and small divices too.


I can't remember what I used them in, was probably just a basic regulator circuit or something. These days with caps a lot smaller and 10uF+ in SMT form, more spoiled for choice :)

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