Operation | 35 | ||
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Table 7. Switches and indicators | |||
Switch or Indicator | Function | ||
Power supply |
| ||
On/standby switch | Applies DC operating voltages to the drive electronics and | ||
(on/ |
| ) | power supply fan when placed in the on ( l ) position. |
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Drive control board |
| ||
Ready LED | This LED flashes during the power on sequence until the | ||
(green) | discs are up to speed and the heads are loaded. | ||
It is on steady with power on complete, assuming that there are no fault conditions.
It flashes during a power off sequence. This occurs when the drive receives a Start/Stop Unit command after it has once been started.
Heartbeat LED | This LED blinks when the SCSI controller is operating |
(green) | properly. |
| If the LED is constantly on or off, it indicates one of two |
| things: |
| • The SCSI controller is not functioning properly. |
| • The SCSI controller is executing diagnostics and |
| should be ready in a few seconds. |
Active LED | This LED socket is provided for units which do not use |
(socket) | the optional bezel. When the active LED is inserted into |
| this socket, it indicates SCSI command activity. |
| When it is on, the drive is executing a SCSI command. |
| When it is off, the drive does not have a SCSI command |
| to execute. |
Optional bezel on drive |
|
Active LED | This LED indicates command activity by the drive. |
(color unspecified) |
|
| When it is on, the drive is executing a SCSI command. |
| When it is off, the drive does not have a SCSI command |
| to execute. |