MSB Technology Analog DAC User Manual page 13

To install a new module, slide the
new module into the track and
push firmly into place.
Now put the screws back into
the base, put the screw back into
the jackpanel of the module, and
return the installation tool to its
place on the base.
Finished!
When installing a new module, remove the black cover the same way
as you would remove a module. It is easy to remove when the two
screws are removed. You will not need a removal tool.
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