Repairing Parasound HCA-2003

Quinn · 10th July 2006, 11:19 PM

Ok,

I was given this parasound hca-2003 through a coworker. The power supply is messed up as you can see from the photos. I do dc-dc stuff (EE) at work but never mess with anything audio related. How hard would it be in your opinions to repair this amp, or should i just salvage the caps, and transformer and look to build something else.

Thanks for any insight whatsoever

"Todo we arnt in synchronous buck switcher land anymore"

jleaman · 10th July 2006, 11:20 PM

Well more pictures would help. But what is the problem with the amp ?

Quinn · 10th July 2006, 11:21 PM

closeup of damage

Quinn · 10th July 2006, 11:23 PM

transformer, weighs a TON.

3 seperate windings, and 90,000uF of 80V output caps.

Its all in pieces, but the rest seems (from observation) to be ok.

Quinn · 10th July 2006, 11:30 PM

back of board, where burn mark is (obviously)

I was told it was a wife dusting fatality. I do not know what happens if the amp is turned on with all the stages hooked back together . Im going to assume nothing...

jleaman · 10th July 2006, 11:30 PM

It would be a nice amp to repair.. You could clean the amp up inside ( board ) with Rubbing Alcohol.

Quinn · 10th July 2006, 11:35 PM

Yeah, cleaning is the easy part, hhehehe.

I dont really know where to begin. Just was going to throw this post out there to make sure i wasnt going to overlook something common.

Ill keep you all updated with whatever i find.

anatech · 11th July 2006, 01:18 AM

Hi Quinn,
I'd start by buying a service manual from parasound. What I have seen so far is a little overheating. Have you done any troubleshooting so far?

-Chris

Quinn · 11th July 2006, 01:36 AM

i havnt even been able to turn the thing on, every board on the unit is diconnected.

they label connectors though, thank god

found more overheating signs

anatech · 11th July 2006, 01:42 AM

Hi Quinn,
Okay, so check whatever they may have told you. You can easily test the rectifiers, look for blown or missing fuses for clues. You can check the output transistors. If there are any regulators in there, check for bad solder joints.

What were you told about the initial problem?

-Chris

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10th July 2006, 11:20 PM	#2
jleaman Banned Join Date: Apr 2002	Well more pictures would help. But what is the problem with the amp ?

10th July 2006, 11:30 PM	#6
jleaman Banned Join Date: Apr 2002	It would be a nice amp to repair.. You could clean the amp up inside ( board ) with Rubbing Alcohol.

10th July 2006, 11:35 PM	#7
Quinn diyAudio Member Join Date: Feb 2005 Location: raleigh	Yeah, cleaning is the easy part, hhehehe. I dont really know where to begin. Just was going to throw this post out there to make sure i wasnt going to overlook something common. Ill keep you all updated with whatever i find.

11th July 2006, 01:18 AM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Quinn, I'd start by buying a service manual from parasound. What I have seen so far is a little overheating. Have you done any troubleshooting so far? -Chris

11th July 2006, 01:42 AM	#10
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Quinn, Okay, so check whatever they may have told you. You can easily test the rectifiers, look for blown or missing fuses for clues. You can check the output transistors. If there are any regulators in there, check for bad solder joints. What were you told about the initial problem? -Chris

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