My electric bass guitar (Yamaha RBX374, active pickup) suddenly stopped producing any sound. Only if I play the strings very hard, I do get some noisy tone.
Here's what I tried:
- I suspected it was a dead battery so I replaced it with a new one, still no sound. I also checked that the voltage from the battery can be measured at the preamplifier.
- I checked with two different amplifiers and doublechecked the cable.
- Knobs (volume, balance, bass, treble) are all in middle position. In the meanwhile, I took out the balance pot and verified that it shows the correct resistance. I haven't put it back in yet but instead clamped the signal of one of the pickups directly to the preamp input (I tried both pickups).
- I checked that all pots, all Gnd pins on the preamp, the cable, the bridge and the strings are all grounded.
I doubt that the problem is in the pickups because I see no reason why they should die at the same time.
My best guess currently is that the preamp is somehow broken but I don't know how to check this.
How can I further debug this?