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Chapter 7 Troubleshooting 75
To Install a Module:
Installing a module is a bit more complex because you first have to be sure the locking
screws are aligned correctly. The following procedure is suggested:
1. Verify that the Controller has been turned OFF.
2. Remove the replacement module from its antistatic packaging. This packaging is
designed to protect the module components from electrostatic discharge.
3. Rotate the two locking screws counterclockwise until the threads on the screws
engage those of the module panel. See Figure 31. By doing this, the screws will
be perfectly perpendicular to the module panel and will align perfectly when the
module is inserted.
4. Insert the module so that the top and bottom edges of the board are riding in the
proper guides.
5. Gently but firmly push the module in until the 64-pin DIN connector at the back
of the module mates with the corresponding connector on the backplane, leaving
the module panel resting against the controller back panel.
6. Rotate the two locking screws clockwise. As the screws are rotated, they will
first disengage from the module panel threads, and then begin to engage those of
the bracket behind the controller panel.
Tighten the screws to where they are just snug. Do not tighten them any further because
you could easily bend the mating bracket.
WARNING!