Cisco C880 M4 Service Manual page 38

Figure 7.2.2
(7) Remove the dummy IOU, and install the IOU.
See Appendix C.9.1, "Installing the IOU (APP0309010)".
(8) Confirm that the Alarm LEDs are not on.
(9) Change Maintenance Mode disabled. See Appendix B.1.2," Disabling maintenance mode
(APP0201020)".
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