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I'm having problems with the preamp of my Cort B4 FL

Sep 4, 2004
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Portugal
Hi!
I'm having some problems with my Cort B4 FL.
When I turn on the preamp, it starts making a lot of noise, the volume drops considerably and the eq controls don't work. When I turn it off, it simply stops making the noise and the volume sounds normal. My first thought was the battery, but it's still charged and I've tried a new one but the result is the same.
I've contacted a friend of mine who's a technician to see what's the trouble, but I've tried to find the wiring schematics for the Bartolini MK1 at the Cort's website but they only have the schematics for the new Markbass that comes with the new ones.
Does anybody here have the wiring schematics for the Bartolini MK1 preamp? I've seen a few in the net but they are for the Ibanez and don't have the on/off switch in the wiring scheme.
Thank you very much.
 
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