Hi all, I've got a C-audio power amp model RA4001. The unit is stuck in "protect" mode and won't energize the softstart bypass relay. The poweramp channels seems ok, and there are no dc-offsets. Either anyone has a good hint or possibly the schematics for this unit. Greatful for any advice. Best regards Stefan
C-audio RA4001 power amp problem
Oct 07, 2007
7 Replies
If it's a MOSFET, check for oscillation.
*24 hours in a day ... 24 beers in a case ... coincidence? *
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
I would suspect the softstart relay still energize, even if one amp channel is bad. It has output relays as well. These doesn't energize either.. No schematics available?
/Stefan
Fortunately I saved the contact email from when the remains of the C-Audio website was still up. Try Mark DOT Ayres AT harmanpro DOT com. He sent me a copy of the RA 1, 2 and 3 series schematics a couple of years ago when I enquired.
Tim Phipps
replace "invalid" with "uk" to reply by email
Tried to mail the above contact, without any reply. Probably, Mark have left Harman. Anyone else have any input for a schematic for a C-audio RA4001 poweramp?
According to
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he is still there. You could try calling them on the number listed on their website.
Tim Phipps
replace "invalid" with "uk" to reply by email
Have you phoned Harman UK ?
Graham
Suggest you sign-up to the 'diy audio' forum and post an enquiry to lee.basham
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"lee.basham If you have any problems with these amplifiers Ii can help I was the product manager and service manager for C-Audio. Circuit diagrams are available for al models of C- Audio products as well as service documentation and first hand guidance."
Note, when searching for schematics for UK manufactured products use the search term "circuit" or "circuit diagram" in place of schematic.
Graham
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