Hi all,
I have a Mackie 402-VLZ3 since about 10 years.
It's a nice toy, I use it with computer out, in, instruments and other stuff that make noise.
Mic channels also have the instrument switch, a buffer that allow me to play with my passive bass directly into the mixer.
The switch stopped to work, when I activate it no sound come out.
the buffers are the 2 opamps of a TL072.
this is the schematic (I attached the complete pdf file):
(https://i.postimg.cc/LqP4VLg5/Cattura.png) (https://postimg.cc/LqP4VLg5)
I measured the voltages:
1. -15.04
2. -15.04
3. -1.87
4. -16.30
5. -1.87
6. -14.96
7. -14.96
8. 16.05
I also tried to probe the output of the opamps and are both mute.
Maybe the tl02 died?
Thanks a lot.
PS. I don't know if this is the correct section, but this is not DIY, so...
PPS. Sorry for bad english. Any errors are google translate's fault ;D
Looks dead to me.