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Front Panel LED
Indicator
DRAFT
10/24/90
12:38
• A 50-conductor flat cable or 25-signal twisted-pair cable
should be used. Cable length shall be equal to or less
than 6.0 meters. This refers to internal and external
cable length (except stubs) .
• A stub length of no more than 0.1 meter is allowed off
the main line interconnection within any connected
device.
The light emitting diode (LED) indicator on the front of the
disk drive is an activity light that indicates the operational
status of the drive from Power-On through the self-test
diagnostics, and into normal operation.
1.
On
2. Flashing
3. Intermittent
When the disk drive is switched on, the LED
normally stays on during the power-on sequence.
The LED stays on while the spindle motor is
being started until it is up to speed. If the LED
does not go out; a catastrophic failure has
occurred. The most probable cause is a failure of
the drive electronics/controller peA.
A Hashing LED (approximately 1 Hz) indicates
that the controller has failed all or a portion of
the internal diagnostic tests.
After the power-on diagnostics have completed,
the LED functions as an activity light and will go
on any time the disk drive is executing a
command, reading, or writing. If the LED is off,
the drive is idle.
Product Installation 2·11
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