After a long moratorium I have decided to start getting back into working with electronics on a hardware level. I managed to trade a bottle of Maker's Mark for an oscilloscope off a coworker and the only issue it seems to have is the trigger won't work. If I move the level adjustment pot it will catch for a split second but won't "hold" at all. It's driving me batty as this is a perfectly operational scope except this minor detail. Does anyone with this series scope have any experience with this happening, if so where should I look?