![Image: c_off_first](https://muse.union.edu/hollochk/files/2021/07/c_off_first.jpg)
1) FIRST! Turn the CURRENT KNOB to zero ( yellow circle ).
![Image: v_off_second](https://muse.union.edu/hollochk/files/2021/07/v_off_second.jpg)
2) SECOND! Turn the VOLTAGE KNOB to zero ( yellow circle ).
![Image: generator_off](https://muse.union.edu/hollochk/files/2021/07/generator_off.jpg)
3) Press the GENERATOR OFF button (red circle).
![Image: filter_panel](https://muse.union.edu/hollochk/files/2021/07/filter_panel.jpg)
4) Wait a minute and then turn off the main valve (blue rectangle). Ignore the red and yellow outlines, they’re for something else.
![Image: sample_in](https://muse.union.edu/hollochk/files/2021/07/sample_in.jpg)
5) Remove your sample.
![Image: shield](https://muse.union.edu/hollochk/files/2021/07/shield.jpg)
6) Replace the shield.
And clean up your damned mess! Thank you very much.