Soundstream Continuum PS shorted.. - diyAudio
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Old 17th July 2011, 01:50 PM   #1
marko is offline marko  United Kingdom
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Default Soundstream Continuum PS shorted..

Hi all, just removed all the PS fets from my Continuum and found one shorted fet, these were new not so long ago as I rebuilt this amp from scratch almost it was working OK then started sapping power..

..so now with all fets removed I have a short from drain to source, any ideas what this could be? all outputs check out fine and gate to drain on PS seams fine too..

Mark.
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Old 17th July 2011, 03:11 PM   #2
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Does twisting the transformer make a difference? You'll need to hold the meter on it continuously because the short may be intermittent.
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Old 17th July 2011, 03:21 PM   #3
marko is offline marko  United Kingdom
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Quote:
Originally Posted by Perry Babin View Post
Does twisting the transformer make a difference? You'll need to hold the meter on it continuously because the short may be intermittent.
I did try this for a little while but to no avail, I can go back and have another try!
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Old 17th July 2011, 03:54 PM   #4
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Most SS amps have snubbers or Zobels < RC networks> across the fets have you checked the caps in these for shorts. They are usually film type caps but I have seen film caps short out.
Look for a large power resistor and some caps near the transformer on each side just atop the fets and in between the transformer and the fets. The resistors run kind of hot when the amps is working.....hope this helps some...
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Old 17th July 2011, 04:23 PM   #5
marko is offline marko  United Kingdom
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Hi Cecil, hope all is well! how are you eyes now?

but year, there is 2 large resistors that do get a little hot and a round/flat cap next to each one..

I definitely have an intermittent short somewhere, just put 2 fets back in and it idles OK until you lift the board up at the PS end then it start pulling amps

how does one test for shorted caps? what resistance should they read?

Mark.
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Old 17th July 2011, 04:42 PM   #6
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Quote:
Originally Posted by marko View Post
Hi Cecil, hope all is well! how are you eyes now?

but year, there is 2 large resistors that do get a little hot and a round/flat cap next to each one..

I definitely have an intermittent short somewhere, just put 2 fets back in and it idles OK until you lift the board up at the PS end then it start pulling amps

how does one test for shorted caps? what resistance should they read?

Mark.

Hi Marko, nice to hear from you old friend. My left is was botched and is not worth very much currently. Right eye is fine now. cataracts a true sign of getting old I guess . Still trying to find a qualified doctor to restore my left eyes vision via re-constructive surgery and Lens replacement. Cross your fingers for me, eh?
Lifting the PC board and having the short appear is bothersome to me. Not having the amp here in front of me i can only guess at this one. But your on to something and I can only suggest that you search diligently to find out why this short occurs. It's definitely not right. I have seen SS toroids short out, so please check carefully under the board where all the bare wires connect and run to the toroid I have seen issues in this area. Some kapton tape and some minor movement of the toroid windings usually will clear anything you find here up.
Film caps should not read anywhere near low ohms on a resistance scale of a voltmeter. If they due pull one end to make sure but IMO any low ohm reading on a film caps is a bad thing.
Let me know what you find, eh?....C
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Old 17th July 2011, 06:32 PM   #7
marko is offline marko  United Kingdom
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well I have a spare Continuum board here so may be able to use parts from the PS from it.. if I can figure out the problem! at least I know what is wrong and that the work already carried out is OK as it did work on all channels then the next time I powered it up it went pop
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Old 17th July 2011, 07:34 PM   #8
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If it has inductors on the secondary side of the power supply, desolder them to break the connection to the audio section. If the short never reappears with the audio section disconnected, it's likely in one of the audio amps. If the short returns, the problem is in the power supply section.
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Old 17th July 2011, 07:36 PM   #9
marko is offline marko  United Kingdom
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Quote:
Originally Posted by Perry Babin View Post
If it has inductors on the secondary side of the power supply, desolder them to break the connection to the audio section. If the short never reappears with the audio section disconnected, it's likely in one of the audio amps. If the short returns, the problem is in the power supply section.
it has four inductors.. one of them does have a little blackening on it

what are they used for?
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Old 17th July 2011, 07:37 PM   #10
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They are part of the DC filter circuit. The black spot may be where it shorted to the case, unless it was between windings.
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