Metrohm NIRS XDS Transmission OptiProbe Analyzer - Manual (Page 70)

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Unplug the power cord. While this is not
essential, it makes access easier. Remove the
communications cable too.
Loosen the six (6) captive screws which hold the
back cover in place. These should only be hand-
tight. If the screws are too tight, use a Phillips-
head or flat-bladed screwdriver to loosen them.
Back the screws out as far as they will go, to
release the back plate. Do not attempt to remove
the captive screws from the back plate.
When all six screws are loose, gently lift the back
plate off the monochromator, and set it in a safe
place.