The Zoom H4n can be used to record a service as follows:

• Turn on the Zoom device by holding downward on its slide power switch.
• If an SD card is present, but the display indicates otherwise: power off-on again or power off the device,
  reseat the SD card and power-on again.
• The Zoom device is fed by sub-faders 3 & 4 from the Mackie board.
  Route desired channels to the Zoom by pressing the "3-4" sub-fader Send button.
• Press the "Record" button TWICE to initiate recording. You should see activity on the meters and the record light should be solid red.
• At the end of the service, press the "Stop" (Square) button again and let the Zoom complete the recording.
• To be safe... power-off the recorder before removing the SD card.