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Old 14th March 2010, 03:38 PM   #1
marko is offline marko  United Kingdom
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Default onkyo A-8200 popping fuses..

just bought an onkyo A-8200 as i thought it would be ideal for a little home project but to my dismay it's faulty soon as i turn it on it pops a 2.5a 250v fuse located just after the transformer, i'm not that clued up on home audio repairs so any thoughts/ideas would be welcome!
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Old 14th March 2010, 04:19 PM   #2
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You may have your hands full. First you must try and isolate the short. Most likely a output transistor has failed and being the main part of the power supply is on the amp board you just can't unplug it. A variac would help but I would guess you don't have one. You may want find a repair shop near you.
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Old 14th March 2010, 04:22 PM   #3
marko is offline marko  United Kingdom
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the power supply is not on the board and is seperate so could be unpluged/desoldered i guess easy enough?
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Old 14th March 2010, 04:31 PM   #4
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the rectifier, filter caps and regulators all live on the main amp board.
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Old 14th March 2010, 04:42 PM   #5
marko is offline marko  United Kingdom
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so if an output has gone what's stopping me just replacing it? apart from a potential 240volt
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Old 14th March 2010, 04:52 PM   #6
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When something shorts there can be many causes and other transistors may be taken out or a drive transistor may have failed first then caused other failures. If you just replace them it may fix it but the possiblity the new tranisitors can be taken out again.
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Old 14th March 2010, 05:13 PM   #7
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Make sure you unplug it when working on it.
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Old 14th March 2010, 05:26 PM   #8
marko is offline marko  United Kingdom
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Quote:
Originally Posted by oldmanaudio View Post
Make sure you unplug it when working on it.
i thought just the caps would give a shock? there are 2 big 50v ones on the main board..

just checked the outputs and they seam to check out ok on the MM.
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Old 14th March 2010, 05:28 PM   #9
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What do you mean they check out fine? How did you come to that conclusion?
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Old 14th March 2010, 05:33 PM   #10
marko is offline marko  United Kingdom
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Quote:
Originally Posted by oldmanaudio View Post
What do you mean they check out fine? How did you come to that conclusion?
i know it's not 100% conclusive but i tested all the 4 outputs for shorts and they ohmed out fine. i usually work on car amps so i'm trying to apply what knowledge i have from there. i'm keen to learn about home amps and open to all critisismn and hints/tips
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