PSU capacitor leakage

Problems with your machine in general.
Post Reply
Kelgors
Posts: 3
Joined: Sun Oct 13, 2019 9:11 am

PSU capacitor leakage

Post by Kelgors » Sun Oct 13, 2019 9:28 am

Hi there,
I just bought an Atari 1024 Ste. After some usage, a lot of smoke appears near the psu.
I've opened it after some times and every capacitors have leaked.
Is there a reason for that ?
Attachments
20191013_093911_crop_91_compress68.jpg
20191013_093911_crop_91_compress68.jpg (68.18 KiB) Viewed 532 times
20191013_100211_resize_80.jpg
20191013_100211_resize_80.jpg (58.22 KiB) Viewed 532 times
520 STf / 1024 STe 4mb RAM

User avatar
IngoQ
Site Admin
Site Admin
Posts: 874
Joined: Tue Aug 22, 2017 8:38 am
Location: Germany

Re: PSU capacitor leakage

Post by IngoQ » Sun Oct 13, 2019 9:38 am

If you're referring to the yellow stuff beneath the caps: Thats no leakage, it's some sort of glue, that prevents the parts from oscillating.

Nevertheless, you should rework the power supply, you can find instructions here https://www.exxoshost.co.uk/atari/last/psu/index.htm and parts in exxos shop.
Ingo :geek:

| Atari 1040STE@32MHz | Amiga 1200 (ACA1220) | Atari 800XL (U1MB, SIDE2) | Atari 130XL (Sophia DVI) | C64 (1541 Ultimate II, Rev3 RFMod Replacement) | TI 99/4A (F18A, 32k, FlashROM 99) | Sinclair ZX Spectrum 128 (Stereo, DivMMC) | Amstrad CPC664 (512k, M4 Wifi) | ... |

czietz
Posts: 119
Joined: Sun Jan 14, 2018 1:02 pm

Re: PSU capacitor leakage

Post by czietz » Sun Oct 13, 2019 9:39 am

That's not leakage around the electrolytic caps, but glue!

However, you must -- I repeat: you must -- replace that RIFA X capacitor. Those have next to 100% failure rate and they fail quite spectacularly with fireworks. Be sure to chose a replacement with the same voltage and safety class X.

EDIT: This user did not replace the RIFA cap, either. Looks exploded, like yours: https://abload.de/image.php?img=atari10 ... l4ck5h.jpg

tzok
Posts: 147
Joined: Sat Dec 30, 2017 2:27 pm

Re: PSU capacitor leakage

Post by tzok » Sun Oct 13, 2019 9:42 am

Electrolytic capacitors seem to be ok, this is definitely not a leak, this is a glue, that holds them in place. Source of a smoke was this 0,1uF X2 film (MPF) capacitor on the primary side.

Kelgors
Posts: 3
Joined: Sun Oct 13, 2019 9:11 am

Re: PSU capacitor leakage

Post by Kelgors » Sun Oct 13, 2019 9:51 am

Thanks for all your replies :)
Ok, so it's not dead. I'll keep it in a safe place until I have some times and tools to repair it.
520 STf / 1024 STe 4mb RAM

tzok
Posts: 147
Joined: Sat Dec 30, 2017 2:27 pm

Re: PSU capacitor leakage

Post by tzok » Sun Oct 13, 2019 12:37 pm

Just replace that burnt 0,1uF 275VAC X cap made by infamous RIFA (you may even remove it, it will work without it) and it shall be ok. If you decide to replace, remember to use an X (or better X2) class capacitor.

stephen_usher
Posts: 363
Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
Contact:

Re: PSU capacitor leakage

Post by stephen_usher » Sun Oct 13, 2019 2:00 pm

Indeed... and don't buy the RIFA ones as they'll die again, eventually.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

Post Reply

Return to “HARDWARE ISSUES”