Hi there,
I've had a faulty Bugera for a number of years that I'm finally now able to start diagnosing and attempting to fix. Any help would be greatly appreciated
When I turn the power switch on the light will come on for a second, there'll be a little hum from the speaker; then the whole thing will shut down, taking the fuse with it.
I removed the power tubes and it continued to blow. I then proceeded to disconnect the power transformer from the board by removing x29 (2 grey wires) and x33 (2 orange, 2 yellow, and 1 purple wire). It would power on. With just x33 attached it would power on. So using my awesome powers of deduction(!) it would seem something with x29 appears to be the culprit.
I re-attached both x29 and x33 and then removed all the fuses on the board. The amp continued to power on and I found I could have fuses F2-F4 on the board, but when I put F1 back in it would blow the mains fuse. I tested the fuse with my multimeter (continuity I think is the word) and my understand is it still works!
I managed to arrive at this stage using information gathered online (but mostly this thread http://music-electronics-forum.com/t13578/) but I haven't found anything to help get passed this stage yet. As you can probably gather my knowledge of circuits is and electronics is pretty poor but I am learning! (I know not to touch the capacitors!) I do have a multimeter so I can take rudimentary measurements
Any advice would be hugely appreciated.
Thanks in advance
I've had a faulty Bugera for a number of years that I'm finally now able to start diagnosing and attempting to fix. Any help would be greatly appreciated
When I turn the power switch on the light will come on for a second, there'll be a little hum from the speaker; then the whole thing will shut down, taking the fuse with it.
I removed the power tubes and it continued to blow. I then proceeded to disconnect the power transformer from the board by removing x29 (2 grey wires) and x33 (2 orange, 2 yellow, and 1 purple wire). It would power on. With just x33 attached it would power on. So using my awesome powers of deduction(!) it would seem something with x29 appears to be the culprit.
I re-attached both x29 and x33 and then removed all the fuses on the board. The amp continued to power on and I found I could have fuses F2-F4 on the board, but when I put F1 back in it would blow the mains fuse. I tested the fuse with my multimeter (continuity I think is the word) and my understand is it still works!
I managed to arrive at this stage using information gathered online (but mostly this thread http://music-electronics-forum.com/t13578/) but I haven't found anything to help get passed this stage yet. As you can probably gather my knowledge of circuits is and electronics is pretty poor but I am learning! (I know not to touch the capacitors!) I do have a multimeter so I can take rudimentary measurements
Any advice would be hugely appreciated.
Thanks in advance
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