IBM 366 Problem Determination And Service Manual page 78

3. Remove the server cover and look inside the server for lit LEDs. Certain
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IBM xSeries 366 Type 8863: Problem Determination and Service Guide
diagnostics panel. This information and the information in "Light path diagnostic
LEDs" on page 63 can often provide enough information to correct the error.
components inside the server have LEDs that will be lit to indicate the location
of a problem. For example, a VRM error will light the LED next to the failing
VRM on the microprocessor tray.
The following illustration shows the LEDs and connectors on the microprocessor
tray.
Light path diagnostics
button
Fan 2
Fan 5
Fan 1
Microprocessor 1
socket
1 1
Microprocessor 2
socket
Microprocessor 1
error LED
Microprocessor 2
error LED
The following illustration shows the LEDs on the PCI-X board.
PCI attention LEDs
PCI power LEDs
Power good LED
Memory
card 1
Fan 3
Fan 6
Fan 7
2 2 4 4
Microprocessor 4 error LED
Microprocessor 4 socket
Memory
card 2
Memory
card 3
Fan 8
Memory
card 4
Microprocessor card
error LED
Fan 4
Microprocessor 3
VRM connector
Microprocessor 4
3 3
VRM connector
VRM 4 error LED
VRM 3 error LED
Microprocessor 3 error LED
Microprocessor 3 socket