rustybeast
New Member
Hi everyone. I recently was given an older fisher CA-65 amp and tuner. It had no sound from the left channel. After checking to make sure the amp was the problem I removed the cover and found the fuse blown. I replaced the fuse and got a loud POP from my speaker and a blown fuse. I replaced the fuse again and unplugged the speaker before turning it on. Checking with my volt meter I have found I have -56v at the left speaker terminal. Any suggestions on where to start? I am assuming one of the components is shorted and putting voltage there. I have Unhooked the A-B speaker switch and volume slider boards and confirmed still getting -56v output on the main board. I have begun to trace back from the output and have been removing each component and testing it but have not found anything yet. (starting with the transistors) Just thought I would try on here and see if anyone had any ideas or maybe a schematic for this thing. I have a fair knowledge of electronic components, what they do, and ho to test them. Thanks for any suggestions.