Parasound JC 1 problems

Swamp 103 · 4th March 2009, 03:14 PM

Hi folks!

I have some problems with one of my JC 1 monoblocks. It turns on like normal and you can hear and feel the relays clicking, but there is no signal out on the terminals. I meassure -1V DC on the loudspeaker terminals when in idle (no loudspeaker connected). I will look at it myself because it's not easy to have someone else look at it where I live (I do have some training on electronics).

Anyone that can help me out here with hint and tips on where to meassure and what to look for? I guess it's difficult to get any schematics of this one?

Best regards

Swamp 103

PMA · 4th March 2009, 07:02 PM

Try Parasound service dept., they are pretty helpful in providing schematics.

john curl · 4th March 2009, 07:37 PM

Sounds like the output relay won't fire, because of oscillation, DC offset, overtemp, or some problem with the protection circuitry. Contact TONY@Parasound.com

Swamp 103 · 7th March 2009, 03:05 PM

Quote:

Originally posted by john curl
Sounds like the output relay won't fire, because of oscillation, DC offset, overtemp, or some problem with the protection circuitry. Contact TONY@Parasound.com

I contacted Tony at Parasound on Friday and it took just a few hours to get respons from him (time difference). He gave me some hints and now I'm up and running again. It was just a shorted capasitor (C5) on the drive-board. It have been changed with a bigger one (it's just a filter cap) while I'm waiting for a new one.

I want to thank Tony at Parasound for his excellent help!!!
My face look like

and the music is playing again.

@John Curl: Are you the same JC that have his initials on this amp?

Thanks to you all!

Rod

john curl · 7th March 2009, 05:06 PM

Yes, the JC initials are mine.

4th March 2009, 03:14 PM	#1
Swamp 103 diyAudio Member Join Date: Mar 2009	Parasound JC 1 problems Hi folks! I have some problems with one of my JC 1 monoblocks. It turns on like normal and you can hear and feel the relays clicking, but there is no signal out on the terminals. I meassure -1V DC on the loudspeaker terminals when in idle (no loudspeaker connected). I will look at it myself because it's not easy to have someone else look at it where I live (I do have some training on electronics). Anyone that can help me out here with hint and tips on where to meassure and what to look for? I guess it's difficult to get any schematics of this one? Best regards Swamp 103

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4th March 2009, 07:02 PM	#2
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Try Parasound service dept., they are pretty helpful in providing schematics.

4th March 2009, 07:37 PM	#3
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Sounds like the output relay won't fire, because of oscillation, DC offset, overtemp, or some problem with the protection circuitry. Contact TONY@Parasound.com

7th March 2009, 05:06 PM	#5
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Yes, the JC initials are mine.

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