EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 29)

Getting Started with Your OTDR
OTDR 15
Inserting and Removing Test Modules
Note: If you are using larger or heavier modules, place them near the bottom of
the unit as much as possible.
4. Insert the protruding edges of the module into the grooves of the
receptacle’s module slot.
5. Push the module all the way to the back of the slot, until the retaining
screw makes contact with the receptacle casing.
6. Place the FTB-500 so that its left panel is facing you.