Chapter 12 Installing, Removing, and ReplacingReplacing the Control ModuleScalar i500 User’s Guide 383module for 41U library configurations is on top of three expansionmodules and below the top expansion module.Removing the ControlModule 12 1 Before removing a module, follow the instructions in Preparing toRemove or Replace a Module on page 362.2 Starting with the topmost module of your library, open the I/Estation and access doors of the module.3 Disengage the Y-rails so the modules can be safely unstacked.a From the front of the library, find the Y-rail release mechanism,which is located on the left side of the module. Squeeze thehandle of the Y-rail release mechanism, lift it, and release it sothat it locks into place.b From the rear of the library, find the rear Y-rail releasemechanism located in the interior of the right side of the module.Squeeze the handle of the Y-rail release mechanism, lift it, andrelease it so that it locks into place.Caution: Before unstacking the modules, the robotassembly must be parked as described inPreparing to Remove or Replace a Module onpage 362.Note: The rear Y-rail is impossible to lift up with the tapedrives installed.
