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Class D Switching Power Amplifiers and Power D/A conversion

Dead bel canto channel
Dead bel canto channel
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Old 15th January 2008, 11:07 AM   #1
Sonovo is offline Sonovo  Niue
diyAudio Member
Join Date: Jan 2008
Default Dead bel canto channel

Disclaimer - I'm not a tech, have never built an amp, but do know which way to hold a soldering iron. That's about it!

I have an eVo4 (200.4 actually, but inside they're identical) that stopped working on one side last night after I swapped speaker cables. It's running in bridged mode, via XLR inputs. I've checked the cables and they're fine.

There's no audio output from the left side (channel 3+4).

The red LED on the front panel is not lit up, there's no smoke, no bulging caps or charred components inside.

I reconfigured it to 4 stereo (non-bridged) and measured for DC output on the terminals, 1-3 have 5 or 6 mV, channel 4 has 12-13mV DC. This is with no input connected. Are there other tests I can do to figure out where the problem lies and how to fix it? I have been in touch with John Stronczer at bel canto, he suggested to measure for DC on the outputs but indicated a much higher value (2.4V) would mean that the channel was dead.

Hopefully (will try soon) channels 1+2 can still drive my monitors until I figure out and fix the problem, I don't know if I want to risk my monitors by trying channels 3+4.

Some people on another forum recommended this one for help in troubleshooting and fixing the problem I'm hoping its something simple and cheap.

The modules inside say: bel canto eVo 200-03A module. Are these still readily available?

I've searched this forum, but didn't find anything else that seemed to help.

Any ideas as to what more I can do to find the problem?

Best regards,
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Old 15th January 2008, 12:12 PM   #2
Sonovo is offline Sonovo  Niue
diyAudio Member
Join Date: Jan 2008
please cancel my post, I've found and fixed the problem.

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Old 15th January 2008, 08:00 PM   #3
phase_accurate is offline phase_accurate
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Join Date: May 2002
Location: Switzerland
Why cancel ? The solution might e interesting for others (unless you made a stupid mistake which you are ashamed of) !


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