Search found 65 matches

by Pacman
Thu Aug 31, 2017 12:42 am
Forum: PSU (power supplies)
Topic: Discharging capacitors, PSU-testing with dummy loads
Replies: 33
Views: 9251

Re: Discharging capacitors, PSU-testing with dummy loads

Oh, I almost forgot... the MSTE PSU (Phihong PSM-5341) service manual/schematic lists the following wire colours: +12V (yellow) -12V (blue) +5V (red) -5V (white) GND (black) PG (orange) But I never trust this sort of information 100% on its own, so I'm going to check the voltage outputs with a multi...
by Pacman
Thu Aug 31, 2017 12:27 am
Forum: PSU (power supplies)
Topic: Discharging capacitors, PSU-testing with dummy loads
Replies: 33
Views: 9251

Re: Discharging capacitors, PSU-testing with dummy loads

Thanks guys. So you're saying the PSU needs to have a load on the +5V line (a 2.2 Ohm high-wattage resistor between +5V and GND) and... a wire connected between the "PG" (Power Good) line or else the PSU won't turn on at all? And with that I can also check the +5V line (DC voltage check between +5V ...
by Pacman
Tue Aug 29, 2017 12:05 pm
Forum: PSU (power supplies)
Topic: Discharging capacitors, PSU-testing with dummy loads
Replies: 33
Views: 9251

Discharging capacitors, PSU-testing with dummy loads

I have two questions concerning before and after recapping an Atari PSU: 1) what is the safe and proper way to discharge a (high voltage) capacitor in the PSU? I prefer not being electrocuted while attempting to desolder it ;) 2) Regarding the use of PSU dummy load resistors (so I can test the PSU a...
by Pacman
Mon Aug 28, 2017 11:39 pm
Forum: PSU (power supplies)
Topic: Mixing different PSU valued capacitors
Replies: 2
Views: 1568

Re: Mixing different PSU valued capacitors

Thanks, it's nice to be here :) Yes, I read both your capacitor write-ups in this part of the forum which was excellent reading! Not too complex (i.e. readable for the non-engineer) and not too general (i.e. informative for hardware hobbyists). I learnt a lot from it and I'm sure others will as well...
by Pacman
Mon Aug 28, 2017 11:59 am
Forum: PSU (power supplies)
Topic: Mixing different PSU valued capacitors
Replies: 2
Views: 1568

Mixing different PSU valued capacitors

First off, congrats on your forum, Exxos! You've done a great job :D A treasure worth of information! I read through your Atari ST PSU capacitor and upgrade information writeup which explained things very well. My foremost question was about why you've suggested to use different valued capacitors ( ...

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