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| How dangerous are RIFAs? |
Posted by: s_pupp on 2023-05-26 09:38:51
After swapping some stuff around last night, I can confirm that removing or incorrectly replacing the RIFA's (in at least the Astec SE/SE30 Power supply) can and will cause interference on the CRT. What did you use to replace the RIFA's? |
Posted by: smrieck511 on 2023-05-26 09:42:17
What did you use to replace the RIFA's? RIFAs from a second Astec supply. Silly I know, but it was the only way to find out for sure. |
Posted by: stepleton on 2023-05-26 10:36:46
It's a little surprising to me that line filter capacitors should have an effect on the display. Having removed the suspicious caps, do they test OK?
I'd be tempted to bet that you wouldn't get the strange behaviour if you put the suspicious caps back in the machine --- that it was something else like a solder bridge or flux residue or some other side-effect of your previous recapping operation. But why mess around with a working system? |
Posted by: smrieck511 on 2023-05-26 10:40:49
hmm...I did clean the board up a bit up with IPA maybe it was something else but it appears to be gone now. To be honest it was irritating not knowing what was causing it as I've recapped several power supplies and never had this issue.
You could be correct so I apologize for the definitive statement. The issue is definitely in the Astec power supply though as I also tried a Sony PSU as well last night and there were no CRT issues. |
Posted by: mari3311 on 2023-05-26 19:48:56
それで 。。。この問題については初めて聞いたと思います。RIFA はアナログ ボード上にありますか、それとも電源にありますか? どこ？幾つか？また、適切な代替品の DigiKey リンクを持っている人はいますか? The RIFA capacitors that are the X2, Y2 capacitors on Analog Powerboard can be substituted with the following capacitors:
US C38 (0.1uF) PHE820ED6100MR06L2 (399-7608-ND)
US C33/C37 (2200pF) PHE850EA4220MA01R17 (399-5416-ND)
International C37 (0.47uF) R46KN347040H1M (399-12444-ND)
International C33/C36 (4700pF) PHE850EA4470MA03R17 (399-5417-ND) |
Posted by: smrieck511 on 2023-05-29 06:01:59
I want to retract my statement that the RIFAs were causing my CRT issue to avoid confusion for anyone in the future.
After checking several things, it appeared to have just been a poorly resoldered ground wire as far as I can tell. I took the RIFA's out completely and rewired the power connections and it appears to have fixed the problem. |
Posted by: stepleton on 2023-05-29 07:22:57
Thanks for the update! This sounds like a more likely explanation to me. Congrats on getting to the bottom of it! |
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