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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: on December 30, 2002, 01:53:43 AM
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I have an A2386 bridgeboard in need of repair. It has Three busted capacitors. I guess it was dropped or something fell on it, I don't know, a friend gave it to me he didn't say what happened to it. I don't have too much to loose trying to fix it myself, I am a fair hand at soldering. I need to know where I might be able to order some capacitors. The local Radio Shack did not stock the right kind nor could they special order any. They have a number B9HC0118. Anybody know where online I might be able to locate the proper capacitors?
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It seems to me in the US there is a mail order type company called Mouser electronics. Really. Or see if you can get a capacitance meter and reach the leftover part of the lead & try to get a reading. Good luck.
Chris
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Try digikey.com or newark.com.
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If they are only ceramic capacitors, they probably just used for RF
decoupling, so therefore shouldn't stop the board from working.
You can buy capacitors from almost anywhere that sells electronic
components. Depending on where in the circuit it's used, you can
sometimes get away with using something quite different.
The numbers you listed don't make a lot of sense. I think I have an
A2386 board here somewhere in the parts box, so if you read me out
the silkscreened name of the capacitors on the board (EG C349) then
I'll tell you what capacitor you need to get.
Anthony.
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Its a group of capacitors in the top front of the board near the floppy drive connectors. They seem to be grouped in pairs. They are tan in color and have a ceramic coating and about 2.5 cm long. The numbers are cp503, cp501, cp506. the others seem to be intact.
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I see the ones you're looking at.
They're capacitor networks, I.E. 8 capacitors in 1 package. They're a
bit specialised and sometimes hard to find though.
The writing says 101kx8 which means there are 8 100pF capacitors.
Looking at the circuit, each capacitor simply sits accross each floppy
signal pin and ground, so they're used for RF decoupling.
That means the board should still work fine without them, but I
suggest keeping ribbon cables as short as possible to minimise
noise/RF pickup.
If you wanted to fix it properly, and can't find a capacitor network,
then here's what I'd do:
Find someone who sells chip components and buy some 0805 sized 100p
caps. On the solder side (bottom) of the board on the actual header
pins, solder each cap vertically between the signal pins (top
row) and the grouns pins (bottom row). One cap per pair of pins.
On the floppy connector every even numbered pin is ground.
Hope that helps,
Anthony.
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Oh forgot to mention, if the battery shows any sign of corrosion
("frosty" on the ends), then replace it as it will leak and damage the
board.
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Thanks for the info and advice. I will probably go ahead and install the board and see what happens. The only real reason I want to use it is to try out the ISA network card I have lying around and see if I can get my amiga to talk nice to my mac.
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I'm not sure if you can access the ISA board through the A2386 like
that?
The best bet if you need to use ethernet, is to get a proper card,
like an Ariadne or X-Surf.
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Nuff said (http://de.aminet.net/pub/aminet/hard/drivr/Etherbridge12.readme) :-D
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Ahh, so you can do it, but you have to to run MSDOS drivers for it and
a server client on the PC side.
Kind of cool that you can do it, but a bit yuck :)
Oh well, would certainly be an interesting project!
Let us know how you get on with it.
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yes, It is kind of a bother to get setup, but I get a kick out of doing stuff like this just to see if it could be done. I will certainly let you know how it works out. It's been years since I had to muck around with dos, so I am not exactly looking forward to setting that part up. :-(
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I use a 286 bridgeboard with my A4000 and I get the same speeds the author obtains from his 386 bridgeboard. It works quite well.
If you have doubts I can help you :-)