Yokogawa PC-Based MX100 - Manual (Page 166)

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SM MX100-01E
10. Remove the Module back plate.
Module back plate
11. Remove the 2 screws shown in the figure.
12. The assembly separates into the AO Power board and the AO CTRL board.
AO Power board AO CTRL board
7.6 Disassembling the MX120 Medium-Speed Analog Output Module and the Medium-Speed PWM Output Module