Virginia Controls, LLC MH-3000 User Manual, 1_03C10-VC Page 110
3. Unplug all the removable I/O terminal strips from the top and bottom of the I/O board.
It is not usually necessary to mark the terminal blocks, since the wiring will normally
hold them in the proper place so that it is obvious which block goes where. If there is
any doubt about their location, then mark the terminal blocks to show where they
should be re-installed.
4. Unplug the I/O Bus Connectors and power connector.
5. Remove the screws holding the I/O board in place.
6. Install the new I/O board by reversing the previous steps.
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