Rockwell Automation T7150A Regent+Plus Communications Modules RS-232, RS-422 and RS-485 - Manual (Page 15)

Communications Modules (T7150A)
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15
Module Removal and Disassembly
Using a small slotted screwdriver, loosen the retaining screw
near the top of the communications module.
Pull open both removal levers on the front of the module. The
module will disengage from the controller chassis. When it is
disengaged, carefully slide the module out of the controller
chassis.
With the module removed, use a #2 Phillips screwdriver to
remove the two screws from the left side of the module.
Remove the four Phillips screws from the right side of the
module (see Figure 8). Remove only those screw indicated in
Figure 8.
Figure 8. Communications Module Disassembly.
After removing the screws, separate the printed circuit board
from it protective metal frame.