#2 Phillips-head screwdriver
Top Cover Removal:
Ensure that the 528E is disconnected from the AC power source.
Remove two 6-32 x 1/2 inch screws from the top panel and two 6-32 x 1/2 inch screws from each side of the chassis.
Lift the top cover free of the chassis.
Changing The XLR Output Level:
The 528E ships from Symetrix with the XLR output configured for a line level output. If you must have a microphone level output, the following steps lead you through the process of switching the XLR line level output to microphone level (or back to line level).
Remove the top cover according to the steps outlined above.
As you look at the unit with the front panel facing you, locate the OUTPUT LEVEL switch (SW7) in the upper right side of the unit just below the XLR output connector. SW7 is in red in the diagram below.
Push the switch in to select MIC level output or out to select LINE level output.
Replace the top cover.
Reinstall the 528E into your setup.