26 January 2014, 21:18 | #1 |
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BPPC - Capacitors
Hi!
I'm just began a short/long journey to repair one of my accelerator boards for Amiga 1200. So far so good, but one of my cards, the Phase 5 Blizzard PPC card has some bad ceramic Capacitors. Anyone here who knows the exact values on them the ones displayed on the picture below? Thanks in advance! |
27 January 2014, 00:17 | #2 |
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Hi,
I will hazard a guess that they are 0.1uf decoupling caps. only way to know for sure is to remove and measure. Use a toothbrush and some isopropyl to see if they clean up before you remove them |
27 January 2014, 00:20 | #3 |
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A wise man once told me that capacitors are unlikely to fail on these cards so probably not a cause for concern. What are the symptoms of your issues?
Unless you have reason to suspect them? |
27 January 2014, 08:17 | #4 |
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@Kipper2k: Thanks, I will do that this week and test.
@fitzsteve: My computer won't boot with the card. I only get a black screen but KB etc works. The capacitors was the only visible ting I could find so why not change them. When I think of it, doesn't the BPPC use alot more juice from the Amiga? Today I use Indivision AGA and a SD as harddrive with the standard small Amiga 1200 PSU. Could that we a reason? |
27 January 2014, 08:31 | #5 |
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It could very well be the PSU. You need a beefy PSU to run an accelerator like a PPC board. More than the typical 2.5A/3A. There are some 4.5A A500 PSUs out there. Alternatively people usually modify a PC PSU for use with the Amiga.
Edit: Ceramic caps like the ones you have, don't usually go bad although it can happen. I'd rather buy in to the PSU theory or dirty connectors. |
27 January 2014, 21:23 | #6 |
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Tried with some Isopropyl alcohol and it worked great, see the result below. I will try to find a new PSU, preferebly Amiga 500 version 2 with 4.5A instead of 3A.
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27 January 2014, 21:41 | #7 |
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next step is to get some of the plastic scouring pads and clean off the edge connector. Oxides build up over time and interrupt the connections. You can try a higher rated PSU as well.
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