Yamaha DTXpress/DTXplorer/DTXtreme

Hi guys! Need some help. I have a dual zone Yamaha cymbal pad, the 
PCY65S, that came with my kit, and it was defective. I think the 
connector( where the stereo cord plugs into the cymbal) is messed 
up, but I can't be sure. If I jiggle the cord in the jack, it will 
produce a sound. There than that it is dead. Yamaha replaced it with 
a new one, but I have this one that doesn't work, and if I could fix 
it, I would have another dual zone pad. How can I trouble shoot, and 
fix it. I am a newbie to this hands on stuff, and I know some of you 
guys can help me out. Also, do I need a special midi cable? I was 
told that I needed one with a biult in opto-isolater (what ever THAT 
is)...I wanna hook up my DTXpress II to my PC. ANY help will be 
appreciated