Hmm, interesting question. Is it completely dead, like no sound, or is it just not working the way it did before? Have you changed anything else on the bass, like the saddle?
Is there any way to get into the body from the back? A removable cover or something?
Does it have a pre-amp built in? How do you change the battery (you did check the battery, didn't you?
)?
The piezo transducer is just in the slot under the bridge saddle, so if you remove the strings and lift out the saddle, you'll see the transducer. The wire goes down through a hole in the bridge to the pre-amp (if you have one) and to the output jack.
If I had it in my hands, the first thing I would do would be to look inside and see if a wire has come loose or something. You might have to do it with a little mirror and a flashlight in the f-hole, unless there is a cover.
Hope this helps.
Ed
