High End Systems MMS200 User Manual page 61

Control Card Removal.
The Control Card is mounted to electronics box with 4 screws,
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Be sure to note all wiring connections. Check that the wiring harness is labeled, and matches the labels on the board before removing.
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Remove the connectors carefully.
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The Control card should be free. Set aside, touching only the edges, and placing on a static free surface.
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MMS200 User Guide --- (Details subject to change, and clarification)
61