User`s guide

Installing Optional Disk and Tape Drives
7-19
SBB Status LEDs
Activity Status LED Fault Status LED Indication
On Off Device is operating properly
Flashing Off Device is operating properly
Off Off Device is inactive and operating
normally. There is no fault.
On On Fault status, device is hung.
Replace SBB.
Off On Fault status, device is inactive
and spun down. Replace SBB.
On Flashing Fault status, device is active and
spinning down due to a fault.