I2C_A Bus And I2C_B Bus; Causes; Power Supply Fault - Sun Microsystems SPARC Enterprise T5120 Installation And Service Manual

Ext sensor Faults (listed in alphabetical order) (4 of 4)
TABLE D-5
Message
Ext sensor /SYS/MB/PCIEn/LINK SEEPROM I2C no device
response. Fault not isolated.
Ext sensor /SYS/MB/PCIEn/LINK SEEPROM corrupt FRUID.
Can't record fault.
Ext sensor /SYS/MB/PCIEn/LINK cannot determine boat
location. Fault not isolated.
D.6.1

I2C_A Bus and I2C_B Bus

These buses support hot-pluggable FRUs and contain I2C devices that are
continuously polled by the fan controller, which is located on the I/O Box
centerplane.
The I2C_A bus consists of boat 0 (IOB0) and PS1.
■
The I2C_B bus consists of boat 1 (IOB1) and PS0.
■
Note – After swapping the FRU, wait more than 5 minutes to allow the status to be
updated. The reason for the delay is that any change in status on either of these buses
is delayed 5 minutes to allow any transient glitches to clear themselves.
D.6.1.1

Causes

Temporary power supply fault
■
Failed I/O Box chassis, power supply, or boat
■
D.6.1.2

Power Supply Fault

If one of the following messages appears for PS0 or PS1, perform the following steps:
Ext sensor /SYS/IOX@nnnn/PSn LEDCTRL I2C no device response. Fault not
■
isolated.
Ext sensor /SYS/IOX@nnnn/PSn THERMCTRL I2C no device response. Fault not
■
isolated.
1. Remove the power supply from the slot for five seconds
2. Reinsert the power supply.
D-10 External I/O Expansion Unit Installation and Service Manual for SPARC Enterprise T5xxx Servers • April 2011
See
Section D.6.3, "Platform I2C Bus" on
page D-12
Section D.6.13, "Can't Read ManR
FRUID Data" on page D-18
Section D.6.11, "Cannot Determine Boat
Location" on page D-17