IBM 7133 D40, Service Manual

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Disk Drive Module Lights
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Ready light: This green light shows the following conditions:
Status of Light Meaning
Off Both SSA links are inactive because one of the following conditions
exists:
v
The disk drive modules, dummy disk drive modules, or module
and SSA attachment that are logically next to this module are not
connected or are missing.
v
The disk drive modules or module and SSA attachment that are
logically next to this module are inactive.
v
An SSA attachment that is in the loop is inactive.
v
A power-on self-test (POST) is running on this disk drive module.
Permanently on Both SSA links are active, and the disk drive module is ready to
accept commands from the using system. The Ready light does not
show that the motor of the disk drive module is running. The
module might be waiting for a Motor Start command, or might have
received a Motor Stop Command.
Slow flash (two seconds on,
two seconds off) Only one SSA link is active.
Fast flash (five times per
second) The disk drive module is active with a command in progress.
The status of this Ready light is also shown in the disk drive status lights at the front of
the 7133.
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Figure 5. Disk Drive Module Lights
Chapter 1. Reference Information
15