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Acoustic Image Contra series II - No audio passing through preamp - Need schematic and parts list. The amp was overdriven due to bad ground in guitar. The amp powers up, but no signal is heard.

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I decided that without a schematic and parts list I shouldn't even attempt to repair it. I had taken the cover off and disconnected the control board from the amp. When putting it back together to return to owner, I noticed the plug and socket for the control board did not go together properly. After a little maneuvering, I managed to get then joined, and just like that the amp was working again. I suspect that who ever had repaired the ground on the guitar had opened the amp up as well, and just didn't get it back together properly. The amp wasn't really damaged, after all.

Posted on Dec 10, 2009

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