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Old 28th September 2005, 10:29 PM   #1
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Default UcD400 Problem

I just finished my UcD400 amp today. Everything was fine for 15 minutes then one of the channel stop . Rails are OK at +-52 volts. Supply is Hypex HG. Any ideas?

Thanks a lot.....I'm desperate.
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Old 28th September 2005, 10:35 PM   #2
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Turn it off and unplug it for 10 minutes or so.... and then try it again. You may have triggered the short circuit protection.
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Old 28th September 2005, 10:41 PM   #3
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Quote:
Originally posted by Kevin Haskins
Turn it off and unplug it for 10 minutes or so.... and then try it again. You may have triggered the short circuit protection.
I was casually listening to music when it stop. I checked voltage and everything seems fine. Unpluged for 15 minutes and still nothing.
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Old 28th September 2005, 10:46 PM   #4
Bgt is offline Bgt  Netherlands
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is the blue light on? is there running any current, I mean 6 or 54ma in 1 rail? if its 6 you're osc. is not running. Had the same a while back.
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Old 28th September 2005, 10:56 PM   #5
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Quote:
Originally posted by Bgt
is the blue light on? is there running any current, I mean 6 or 54ma in 1 rail? if its 6 you're osc. is not running. Had the same a while back.
Blue light is on. 25ma on the positive rail.
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Old 29th September 2005, 12:04 AM   #6
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So...anything else I can try before dumping it? Any clue ?
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Old 29th September 2005, 01:05 AM   #7
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Check the basics first like input cable connections etc. Something could have come loose.
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Old 29th September 2005, 01:09 AM   #8
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Quote:
Originally posted by classd4sure
Check the basics first like input cable connections etc. Something could have come loose.
Already checked. Input is OK. 100kohms on balanced input.
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Old 29th September 2005, 01:16 AM   #9
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If that can help, I replaced the output filter cap with metallized polypropylene .68uF 250V MKP 416-420 on both module.
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Old 29th September 2005, 01:17 AM   #10
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Sounds like your protection is tripped for some reason, pre amp possibly.
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