IBM 7133 Series, Service Manual

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Check light ( ): This amber light shows the following conditions:
Status of Light Meaning
Off Normal operating condition.
Permanently on One of the following conditions exists:
An unrecoverable error that prevents the normal operation of the
SSA link has been detected.
The power-on self-tests (POSTs) are running or have failed. The
light comes on as soon as the disk drive module is turned on, and
goes off when the POSTs are complete. If the light remains on for
longer than one minute after the disk drive module is turned on, the
POSTs have failed.
Neither SSA link is active.
The disk drive module is in Service mode, and can be removed
from the 7133.
Flashing The Check light has been set by a service aid to identify the position of
a particular disk drive module.
Chapter 1. Reference Information
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