IBM 3580-L11 Setup Guide - Page 76
in the single-character, display changes
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Maint Mode: Select Exit Maint Mode Note: If a cartridge is in the tape drive, it will eject the first time that you press the unload button and the drive will not be placed in maintenance mode. To continue placing the drive in maintenance mode, perform the preceding step. 4. Press the unload button once per second until H appears in the single-character display and the following message displays. (If you cycle past the desired code, press the unload button once per second until the code redisplays.) Maint Mode: Select Test Head 5. Press and hold the unload button for 3 or more seconds, then release it to select the function. Immediately after the following message displays, insert a scratch (blank) data cartridge that is not write-protected (or the tape drive exits maintenance mode). Test Head Load Scratch Tape After you insert the scratch data cartridge, the flashing C in the single-character display changes to H and one or more of the following messages display: Test Head Tape Loading Test Head Locating = = = > Test Head Rewinding = = = > followed by: Test Head Writing = = = > The tape drive runs the tests. v If no error is detected, the test will loop and begin again. To stop the loop, press and hold the unload button for several seconds. When the loop ends, 0 temporarily appears in the single-character display. The drive rewinds the tape, unloads the cartridge, and displays the following message: Passed! Tape Unloading The drive then exits maintenance mode and displays the following message: Ultrium Tape Drive Drive Empty v If an error is detected the test stops, 5 appears in the single-character display, and the following message displays: 60 IBM 3580 Tape Drive Setup, Operator, and Service Guide