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Post subject: SCX2 No output
Posted: Tue Sep 06, 2016 6:19 pm
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Hello out there. I recently acquired a Super Champ x2 and it had very low output compared to a new SCX2 I had heard days prior. I was told it was re-tubed the day before I received it. As I was playing it, the volume decreased more and more until eventually nothing. The speaker hisses but no out put. I opened up the amp and looked for anything obvious and nothing. I checked the bias and it was set to 48mv which I thought was a bit high. I turned the amp on with the chassis out and the speaker plugged in and tried to play, this time no LED on the channel select. It's like to preamp was unpowered at all. I started checking the components against the service guide pdf I found online and found one bad diode. "D3" which is placed in circuit between the two 6v6s. I also noticed that R64 7.5ohm resistor was very hot and burnt looking but still held the resistance it is supposed to. In the circuit with R64 is U4 which is a voltage regulator that sends 3.3volts to the preamp. I believe the voltage regulator shut down on thermal overload but I am not positive. Anyone had any similar issues like this? Thanks

Here is the link to service manual https://www.google.com/url?sa=t&source= ... M5FOwuksMw


Last edited by x2face on Wed Sep 07, 2016 12:52 pm, edited 2 times in total.

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Post subject: Re: SCX2 No output
Posted: Wed Sep 07, 2016 2:13 am
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Joined: Fri Feb 05, 2010 4:31 am
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Location: Province de Québec, Canada
Link to schematic may help to have answer :wink:


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