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by mikro
Wed May 13, 2020 12:38 pm
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 73
Views: 23984

Re: How to: recapping the Mega STe power supply

Pacman wrote:
Wed May 13, 2020 10:03 am
my board has neither a -001 nor -002 designation but "Rev A1", specifically this is what it says on the PCB:
FYI, "-001" or "-002" is written on the metal case, not PCB. It's a paper sticker.
by mikro
Tue May 12, 2020 5:14 pm
Forum: PSU (power supplies)
Topic: Atari TT's LM7905CT getting too hot
Replies: 22
Views: 3762

Re: Atari TT's LM7905CT getting too hot

mikro wrote:
Mon May 11, 2020 8:24 pm
I'll report when I will have it all up and running.
Reporting: everything put together, has been running for hours now.

Thanks everyone for hints and advice!
by mikro
Tue May 12, 2020 12:16 pm
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 73
Views: 23984

Re: How to: recapping the Mega STe power supply

Pacman: yes. It is explained in the quoted text in the first post of yours. :) The screw must be removed and the hole insulated.
by mikro
Tue May 12, 2020 6:54 am
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 73
Views: 23984

Re: How to: recapping the Mega STe power supply

See my previous post - Exxos was so kind to edit the picture to correct C14 but you can still add the mention about the central screw. Your picture (and I assume the physical PSU, too) still has it, it shouldn't be there.
by mikro
Mon May 11, 2020 8:24 pm
Forum: PSU (power supplies)
Topic: Atari TT's LM7905CT getting too hot
Replies: 22
Views: 3762

Re: Atari TT's LM7905CT getting too hot

czietz , I bow to your analytical skills and knowledge. Again and again. :) Anyway, there has been an interesting development. My "analysis" wasn't actually that different, I saw two pins going to the same place on the PCB so I was thinking "OK, whatever is coming out of those two pins, it must be ...
by mikro
Mon May 11, 2020 8:08 pm
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 73
Views: 23984

Re: How to: recapping the Mega STe power supply

What a great guide! There is an error with C14 - it doesn't have + on the left on and - on the right but - on the top and + on the bottom. Just a note, this is still wrong in the picture. Also, when upgrading the PSU, make sure you have insulated the nut in the middle (and not used the bolt again),...
by mikro
Mon May 11, 2020 11:25 am
Forum: PSU (power supplies)
Topic: Atari TT's LM7905CT getting too hot
Replies: 22
Views: 3762

Re: Atari TT's LM7905CT getting too hot

czietz thank you for the test & confirmation, I had no idea that is normal to have such temperature on a electronics component, wow. Yesterday I checked all the rails, I couldn't see anything suspicious. It's true I had only the poor man's tool for detecting ripples, i.e. min/max but it seemed all ...
by mikro
Sun May 10, 2020 7:57 am
Forum: PSU (power supplies)
Topic: Atari TT's LM7905CT getting too hot
Replies: 22
Views: 3762

Re: Atari TT's LM7905CT getting too hot

It ges more and more interesting. While I had the MegaSTE PSU in TT, I was thinking let's try the other way around - so I put the TT PSU in the MegaSTE. And to my surprise, the PSU behaves totally differently - the regulator is nowhere that hot (I would say warm at best) and of course no restarts. W...
by mikro
Sat May 09, 2020 11:54 pm
Forum: PSU (power supplies)
Topic: Atari TT's LM7905CT getting too hot
Replies: 22
Views: 3762

Re: Atari TT's LM7905CT getting too hot

As it is getting late I didn't have time for something serious so I just tried one more thing - MegaSTE PSU in the TT. And, as you would have guessed, it not only works but the regulator is freaking hot as well. But 1,5 hours later everything still works as it should. So that makes my initial suspec...
by mikro
Sat May 09, 2020 9:44 pm
Forum: PSU (power supplies)
Topic: Atari TT's LM7905CT getting too hot
Replies: 22
Views: 3762

Re: Atari TT's LM7905CT getting too hot

Thank you for the effort, though. :) I'll try to investigate further in the meantime. What can I say with a certainty, it definitely seems that the lesser devices / CPU activity, the better. Just staring at empty desktop makes the computer more "stable" (but the regulator is still super hot). With a...

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