IBM XSERIES 255 TYPE 8685, Hardware Maintenance Manual And Troubleshooting Manual

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System-board LED locations
The following illustration shows the location of the LEDs on the system board. You
might need to refer to this illustration when solving problems with the server.
PCI-X slot 2 power (CR19)
PCI-X slot 7 power (CR24)
PCI-X slot 2 attention (CR14)
PCI-X slot 7 attention (CR25)
PCI-X slot 3 attention (CR15)
PCI-X slot 6 attention (CR18)
PCI-X slot 4 attention (CR16)
PCI-X slot 5 attention (CR17)
PCI-X slot 3 power (CR20)
PCI-X slot 6 power (CR23)
PCI-X slot 4 power (CR21)
PCI-X slot 5 power (CR22)
VRM 2 (CR34)
VRM 3 (CR37)
VRM 1 (CR31)
VRM 4 (CR39)
Microprocessor 2
(CR42)
Microprocessor 3
(CR38)
Microprocessor 1
(CR43)
Microprocessor 4
(CR30)
System board
VRM (CR45)
SCSI channel B in
LVD mode (CR33)
SCSI channel A in
LVD mode (CR32)
ISMP activity (CR13)
Light Path Diagnostics
panel (CR44)
Memory board
VRM (CR46)
Important: The amber CR44 LED also illuminates if the cable interface from the
system board to the light path diagnostics panel is missing or incorrectly connected.
Therefore, verify that the required cable is present and correctly connected before
you replace the light path diagnostics panel.
Chapter 4. Customer replaceable units
47