For example, failure to pick or place a cartridge from or to a designated cell ordrive location after exhausting the retry count will result in a failed operation withthe appropriate error code. However, failure to detect a particular cell location bysensing the prism fiducial located on the cell shelf because it is missing ordamaged will eventually result in the cell location being located by the gripper, barcode reader and positional emitter pulse count after the prism detection retrycount is exhausted. If several prisms are missing or damaged or if the accessorprism sensor/emitter is inoperable, initialization and/or inventory functions cantake a prolonged amount of time to complete due to the lengthy retry recoveryprocedure.If the library is taking an extended amount of time to initialize, to perform aninventory or even move a cartridge within the library, the magazines prismintegrity should be verified prior to exchanging a library component. This situationcan be noted by the ACTIVITY line on the Operator Panel posting Recovery. Prismintegrity verification can be done by releasing the magazines and inspecting thecell prisms. Normal initialization or inventory time for a 2U library once the pickermechanism starts its operation should be approximately 1 to 2 minutes. For a 4Ulibrary, 2 to 3 minutes. A single missing or damaged prism can add 1 to 2 minutes.If the accessor tray sensor/emitter is inoperable, or several prisms are missing ordamaged, initialization or inventory could exceed 30 minutes or longer. Refer toTroubleshooting table “Cartridge Movement Problems”.Procedures for Isolating CRU ProblemsIsolating a Power Supply ProblemNote: Not all power supplies have LEDs. The original power supply for the 2Ulibrary did not have LEDs though any power supplies replaced will likelyhave LEDs. The 4U library has power supplies with LEDs.a77ug136134625Figure 7-1. A 250w power supply with LEDsChapter 7. Troubleshooting 7-7
