IBM System x3500 Service Manual page 142

2. To view the light path diagnostics panel, press the release latch on the front of
3. Remove the server cover and look inside the server for lit LEDs. Certain
132
IBM System x3500 Type 7977: Problem Determination and Service Guide
Power-on
LED (green)
Power SCSI or IDE
control bus activity
button LED (green)
the operator information panel to the left; then, slide it forward. This reveals the
light path diagnostics panel. Lit LEDs on this panel indicate the type of error that
has occurred.
The following illustration shows the light path diagnostics panel.
1
POWER
SUPPLY
2 MEMORY
DASD/
CONFIG
RAID
TEMP FAN
PCI
BUS
CPU S_ERR VRM
SP BUS
NMI
SEE INSIDE COVER FOR MORE SERVICE INFORMATION
Look at the system service label on the top of the server, which gives an
overview of internal components that correspond to the LEDs on the light path
diagnostics panel. This information and the information in "Light path diagnostics
LEDs" on page 133 can often provide enough information to diagnose the error.
components inside the server have LEDs that will be lit to indicate the location
of a problem.
The following illustration shows the LEDs on the system board.
System
locator System error
LED (blue) LED (amber)
System
information
LED (amber)
REMIND