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Old 09-09-2012, 10:38 AM   #1
Vlabguy1
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Default Amiga - Always an adventure :)
Well the other day I wanted to setup my A2000 toaster as I have not powered her up in a long time. So I put it on the desk took the cover off just to make sure all was clean etc. And I actually forgot what add-on cards were installed in her. So the second I clicked the power switch.. a loud pop and spark came from the the Toaster card, lol. At that point I wasn't sure if it was the card or the power supply. I fearing this had done some other damage I took the card out and powered the computer up .. all was fine. Toaster card not so much hehe..(see image).
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Old 09-09-2012, 12:21 PM   #2
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Default Re: Amiga - Always an adventure :)
So, what's the decision? Repair or replace?
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Old 09-09-2012, 12:27 PM   #3
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Default Re: Amiga - Always an adventure :)
I would say replace it and the blue one next to it. The chip and other items look ok, my brain is dead so it eludes me right now what stuff is, so it may be salvageable.
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Old 09-09-2012, 03:06 PM   #4
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Default Re: Amiga - Always an adventure :)
Sorry to hear (see) this one. I'll bet it got your attention when it popped.
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Old 09-09-2012, 03:58 PM   #5
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Default Re: Amiga - Always an adventure :)
I suspect it's an tantalum capacitor which are very sensitive to overvoltage (asfair). Replace it, I would say. However the reason it failed ight be that it's too old and thus other capacitors may be faulty soon too.
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Old 09-09-2012, 04:03 PM   #6
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Default Re: Amiga - Always an adventure :)
More than likely the votage regulator next to the cap blew the circuit.
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Old 09-09-2012, 04:23 PM   #7
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Default Re: Amiga - Always an adventure :)
What makes you draw that conclusion?
pic
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Old 09-09-2012, 04:49 PM   #8
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Default Re: Amiga - Always an adventure :)
Cause tantalum caps are much less prone to leakage between the anode and cathode (unlike tin wrapped electrolytic caps) over time. However, your typical VR may draw too much current if the output voltage exceeds the input voltage (can occur from a power supply sitting for a long time) and not supplying the nessessary voltage to operate the VR correctly. When this happens the excess voltage is dissipated as heat and may draw too much current from surrounding components such as caps and resistors. At least test the VR with an Ohm meter for a short before replacing the cap and reapplying voltage. Also, since you already have removed the toaster board, let you PSU regulate itself by running the machine for and hour or so. But hey, who knows, without a schematic and testing all votages and current sources it could be anything. We always had a saying about electronics... it's FM (effing Magic) LOL
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Old 09-09-2012, 04:55 PM   #9
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Default Re: Amiga - Always an adventure :)
Could try running the Toaster board standalone to avoid risk to your main computer.
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Old 09-09-2012, 05:37 PM   #10
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Default Re: Amiga - Always an adventure :)
Quote:
Originally Posted by motrucker View Post
Sorry to hear (see) this one. I'll bet it got your attention when it popped.
Yes it was loud and instant as soon as I reached across the power supply to turn the switch on the back. And the flash was pretty bright too. Not sure but maybe the card was touching the power supply and some how shorted it out.

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Old 09-09-2012, 05:42 PM   #11
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Default Re: Amiga - Always an adventure :)
Quote:
Originally Posted by Vlabguy1 View Post
Yes it was loud and instant as soon as I reached across the power supply to turn the switch on the back. And the flash was pretty bright too. Not sure but maybe the card was touching the power supply and some how shorted it out.

.
Yea, I remember when I put the Toaster board in my A2000 the components where way to close to the PSU and other metallic parts so I put a piece of cardboard the full length of the component side of the Toaster board.
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Old 09-09-2012, 05:43 PM   #12
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Default Re: Amiga - Always an adventure :)
Quote:
Originally Posted by gizmo350 View Post
More than likely the votage regulator next to the cap blew the circuit.
Ah maybe. Honestly I have not looked at it much, just to take the pic. I really wanted to make sure the machine worked. I will eventually do a repair, if possible. I could throw another Toaster card in to see if I get the same result..lol.. But finding the cause would be
the top priority before plugging in another board.

Rich
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Old 09-09-2012, 05:57 PM   #13
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Default Re: Amiga - Always an adventure :)
Quote:
Originally Posted by Vlabguy1 View Post
I could throw another Toaster card in to see if I get the same result..lol.. Rich
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Old 09-10-2012, 07:44 PM   #14
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Default Re: Amiga - Always an adventure :)
Quote:
Originally Posted by gizmo350 View Post
I wouldn't actually do that.. just an fyi

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Old 09-10-2012, 08:43 PM   #15
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Default Re: Amiga - Always an adventure :)
Quote:
Originally Posted by Vlabguy1 View Post
Ah maybe. Honestly I have not looked at it much, just to take the pic. I really wanted to make sure the machine worked. I will eventually do a repair, if possible. I could throw another Toaster card in to see if I get the same result..lol.. But finding the cause would be
the top priority before plugging in another board.

Rich
I would repair the popped cap first, and then try it again, I mean at the most we are talking a buck 98 here. $1.98. If it pops again I would try the VR, and look very carefully at the components around the cap. Try plugging the card back in and take some voltage measurements.

Now repeat after me as you turn on the Amiga, you have to yell out

SMOKE CHECK!!!

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