IBM RS/6000 Enterprise Server M80, Service Manual

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Secondary I/O Drawer Operator Panel Message Hierarchy
The messages that are displayed in the operator panel on secondary I/O drawers are arranged
hierarchically, from highest priority to lowest priority. The message hierarchy is as follows:
1. 8-character error code
This indicates a critical error; the drawer power will be shut down. Standby power is still on, so the
error message is still displayed in the operator panel. The I/O drawer Attention LED will be on. The
error code displays on the top line of the display panel, left-justified. A FRU part number may also be
displayed, right-justified, in the second line of the display.
2. 8-character informational message
This is a noncritical message, so the drawer power will not be shut down. The message should be
investigated to see if service actions are indicated. A FRU part number may also be displayed,
right-justified, in the second line of the display.
When 8-character codes are displayed, they are in the form 10n1xxxx, where n is the drawer number.
3. 8-character checkpoint
There is one 8-character checkpoint that displays, 10n100AA, where n is the drawer number. This
checkpoint indicates that the system power control network firmware is being updated, and the
checkpoint displays for approximately 15 seconds. This is the only checkpoint that displays on a
secondary I/O drawer operator panel.
4. Drawer number
This will be in the form U0.n, where n is the drawer number. This message will normally display unless
a higher-level message is required.
When ac power (dc power in a dc-powered system) has been disconnected from the system, then
reconnected, the I/O drawer addresses on the secondary drawers will temporarily appear in the format
*0n, where n is the drawer number. After the system is powered on, and the boot sequence has been
initiated, the drawer numbers are restored to the U0.n format.
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Service Guide