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+--- Thread: troubleshooting a semi-broken KOMA Field kit mixer... (/thread-11.html)
troubleshooting a semi-broken KOMA Field kit mixer... - jacobsteel - 07-31-2022
I love my KOMA field kit and field kit FX (I got them 2nd hand) but my field kit mixer has a broken channel 1.
I've measured on the board and the working channels (2-3-4) have around 4 V on the center pin of the tone control.
However, the broken / dead / channel (1) measures 6-7 V on the tone control center pin.
I fear the mixer might be out of warranty - but if anyone here has solved a similar problem I'd be very grateful to hear about it. (I'm thinking along the lines of: if the buffer-amp is broken, possibly you could add an extra LM324 just to handle channel 1 input?)
RE: troubleshooting a semi-broken KOMA Field kit mixer... - chrisi - 08-04-2022
If one of your channels in the mixer is broken, it's usually quickest to swap out the LM324s that make up the mixer. It's U1, U2 and U3 in the schematics. I would do it in that order.