UcD400 Problem

tomahack · 28th September 2005, 09:29 PM

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.

Kevin Haskins · 28th September 2005, 09:35 PM

Turn it off and unplug it for 10 minutes or so.... and then try it again. You may have triggered the short circuit protection.

tomahack · 28th September 2005, 09:41 PM

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.

Bgt · 28th September 2005, 09:46 PM

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.

tomahack · 28th September 2005, 09:56 PM

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.

tomahack · 28th September 2005, 11:04 PM

So...anything else I can try before dumping it? Any clue ?

classd4sure · 29th September 2005, 12:05 AM

Check the basics first like input cable connections etc. Something could have come loose.

tomahack · 29th September 2005, 12:09 AM

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.

tomahack · 29th September 2005, 12:16 AM

If that can help, I replaced the output filter cap with metallized polypropylene .68uF 250V MKP 416-420 on both module.

classd4sure · 29th September 2005, 12:17 AM

Sounds like your protection is tripped for some reason, pre amp possibly.

28th September 2005, 09:29 PM	#1
tomahack diyAudio Member Join Date: Oct 2002 Location: Montreal	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. __________________ Do your way, it's the only way.

28th September 2005, 09:35 PM	#2
Kevin Haskins diyAudio Member Join Date: Mar 2004 Location: Port Angeles, WA	Turn it off and unplug it for 10 minutes or so.... and then try it again. You may have triggered the short circuit protection. __________________ www.diycable.com

28th September 2005, 09:46 PM	#4
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	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. __________________ Kind regards, Bert

28th September 2005, 11:04 PM	#6
tomahack diyAudio Member Join Date: Oct 2002 Location: Montreal	So...anything else I can try before dumping it? Any clue ? __________________ Do your way, it's the only way.

29th September 2005, 12:16 AM	#9
tomahack diyAudio Member Join Date: Oct 2002 Location: Montreal	If that can help, I replaced the output filter cap with metallized polypropylene .68uF 250V MKP 416-420 on both module. __________________ Do your way, it's the only way.


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29th September 2005, 12:05 AM	#7
classd4sure Account Disabled Join Date: Feb 2004	Check the basics first like input cable connections etc. Something could have come loose.

29th September 2005, 12:17 AM	#10
classd4sure Account Disabled Join Date: Feb 2004	Sounds like your protection is tripped for some reason, pre amp possibly.

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