Advantech UNO-1170E - Manual (Page 33)

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3. Remove the rear cover.
4. Find 2 metal spacer from accessory bag, and screw tight on the
location indicated arrow in the below picture. (Note: There were
spacers soldered on the daughter board already). Normally you will
also get some hexagon spacer from your PCI-104 card packing.
Use and screw those spacers on the location indicated black shown
in below picture.
5. Please refer to section 2.12 for PCI-104 card voltage setting before
install the PCI-104 card.