Electro-acoustic tuner/eq hum and buzz

[Powertripper]

Hey guys,

I'll be recording in a few weeks with my Takamine G series electro-acoustic bass, though it needs a bit of TLC. A problem that I cannot get my head around is a very specific buzzing every time I activate the onboard tuner/eq unit, which causes an almost 'beeping' style buzz every time the tuner light is illuminated (which is every second or so), so the buzz is in tandem with the tuner lights. It's nothing obvious and can't find much online about the same issue. Has anybody had any experience of this kind of thing? Any direction whatsoever would be appreciated.

Cheers.