Help - dead power supply in assemblage dac

zerotohero · 9th March 2010, 11:01 AM

Hi there,

I have an assemblage 2.7 dac that blew its transformer and fuse while i was on holiday.
I replaced the psu with the identical model and the lights all came on so i thought everything was fine.
However after leaving it on for several minutes it started to smell and slowly started to bulge like the previous transformer had.
When I started hearing "bubbling" noises from within the transformer i turned it off.
Surprisingly the fuse didn't blow.
Ive thoroughly checked the pcb on both sides and all components and cant see any further damage.
Does anyone have any ideas what could be wrong and how to fix it?

qusp · 11th March 2010, 08:08 PM

hang on, so you didnt just turn it off when it started to bulge :S by thoroughly checking and you cant 'see' any damage, do you have a multimeter? this sound like there is an internal short in something or a bad cap and you simply applied power to something that is already shorted out and of course it just repeated the fail condition like last time. i'm unfamiliar with the dac so aside from recommending you go over the thing with a meter and give us some better pictures, i'm afraid I cant help that muchand BTW the pictures although they say under them are high resolution are just the same size as the previews when you click on them ie. they dont enlarge when you click, so its hard to see anything. but yeah doesnt sound like we would be able to see anything anyway.

firechief · 11th March 2010, 09:50 PM

We can probally help you find the problem but you must try to locate a schematic to post. There is somethng very wrong indeed! I wonder what exactly you replaced. Did you find a used part? Both of the transformers that got hot/smelly/buldgy are probally toast. Also we still have no idea what the oridginal problem was. I will have a stab at finding a schematic.

zerotohero · 1st June 2010, 02:27 PM

Ive finally managed to get a psu schematic.
Hopefully its readable.
Can anyone help with this?

2shared - download assemblage psu schematic.jpg

zerotohero · 1st June 2010, 02:50 PM

I had problems with the last upload so if it doesnt work try downloading this jpeg.
Its 7.2megs so should be quite readable;

assemblage psu schematic.jpg

9th March 2010, 11:01 AM	#1
zerotohero diyAudio Member Join Date: Oct 2009	Help - dead power supply in assemblage dac Hi there, I have an assemblage 2.7 dac that blew its transformer and fuse while i was on holiday. I replaced the psu with the identical model and the lights all came on so i thought everything was fine. However after leaving it on for several minutes it started to smell and slowly started to bulge like the previous transformer had. When I started hearing "bubbling" noises from within the transformer i turned it off. Surprisingly the fuse didn't blow. Ive thoroughly checked the pcb on both sides and all components and cant see any further damage. Does anyone have any ideas what could be wrong and how to fix it?

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11th March 2010, 08:08 PM	#2
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	hang on, so you didnt just turn it off when it started to bulge :S by thoroughly checking and you cant 'see' any damage, do you have a multimeter? this sound like there is an internal short in something or a bad cap and you simply applied power to something that is already shorted out and of course it just repeated the fail condition like last time. i'm unfamiliar with the dac so aside from recommending you go over the thing with a meter and give us some better pictures, i'm afraid I cant help that muchand BTW the pictures although they say under them are high resolution are just the same size as the previews when you click on them ie. they dont enlarge when you click, so its hard to see anything. but yeah doesnt sound like we would be able to see anything anyway.

11th March 2010, 09:50 PM	#3
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	We can probally help you find the problem but you must try to locate a schematic to post. There is somethng very wrong indeed! I wonder what exactly you replaced. Did you find a used part? Both of the transformers that got hot/smelly/buldgy are probally toast. Also we still have no idea what the oridginal problem was. I will have a stab at finding a schematic.

1st June 2010, 02:27 PM	#4
zerotohero diyAudio Member Join Date: Oct 2009	Ive finally managed to get a psu schematic. Hopefully its readable. Can anyone help with this? 2shared - download assemblage psu schematic.jpg

1st June 2010, 02:50 PM	#5
zerotohero diyAudio Member Join Date: Oct 2009	I had problems with the last upload so if it doesnt work try downloading this jpeg. Its 7.2megs so should be quite readable; assemblage psu schematic.jpg

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