IBM LTO Generation 3, Instruction Manual, Page: 50 / 54

Drive Diagnostic Functions
Display
Code Front Panel Maintenance Function
U Disable POST error Reporting (Turn function OFF)
P Enable POST error Reporting (Turn function ON)
L Load/Unload Test (10 load/unload cycles)
H Test Head
F Fast Read/Write Test (Capacity/Performance Test)
E Test Cartridge & Media
C Insert Cartridge into Tape Drive
A Clear Error Code Log