10 Retrofitting optional boards
8
Step
Action
3
Disconnect all screw terminals and interface cables connected at
the rear of the device. To prevent connections being interchanged,
note down the assignment of the connectors to the sockets.
4
Undo (do not remove) the two countersunk screws on the bottom
of the case and remove the pan head screw on the side of the case.
5
Now open the rear panel of the case and remove it.