Rockman X100 oscillation

[Xavier]

Hi !..... I just bought a Rockman X100, after years of looking for one...

It sounds awesome, but it has an issue,

With nothing connected, it does this funny oscillation.............. it stops as soon as I plug the guitar in ( so it's not such an issue really), but still I'd like to be able to fix it. The regulated power supply is the original one.

I has similar issues in the past when building high gain projects like the Dr Boogey or the Friedman BE-OD. Oscillation that stops once you plug the guitar in.

Any hint on what could be causing this would be deeply appreciated.

here's link to the schematic https://www.dropbox.com/s/3kii0qlqiwtoosj/rockman-x100-and-soloist-schems.pdf?dl=0

Thanks in advance !!

[Ripthorn]

I'm not sure if I'm reading it right, but it looks like the input jack should be grounding the input when nothing is plugged in. More than likely, that is not happening whether it be due to contact corrosion, bad jack, etc.

[Xavier]

Thanks for the reply ! Yes that makes sense.... funnily enough, someone told me that it's 100% normal, as it has 2x LM386 and apparently they will oscillate..... grounding the jack input is the solution.....thanks !