Light path diagnostics
The following illustration shows the remind button and the LEDs on the light path
diagnostics panel. The light path diagnostics panel is inside the server under the
left-side cover, and the error LEDs are also visible through the left-side cover.
CPU
VRMS_ERR
MEMORY
DASD/
RAID
NMI
SP BUS
FAN
POWER
SUPPLY
PCI
BUS
2
1
CONFIG
TEMP
REMIND
SEE INSIDE COVER FOR MORE SERVICE INFORMATION
Press the remind button on the light path diagnostics panel to acknowledge that an
error has occurred but indicate that you will not take immediate action. When you
press the remind button, the system-error LED flashes every 2 seconds until the
error is corrected. If another error occurs, the system-error LED stops flashing and
is lit again.
For more information about light path diagnostics, see the Problem Determination
and Service Guide on the IBM System x Documentation CD.
Diagnosing problems using light path diagnostics
LEDs in three locations on the server are available to help you diagnose problems
that might occur during installation. Use them in the following order:
1. LEDs on the front of the server: Look at the front of the server. If a system
error has occurred, the system-error LED on the front of the server is lit.
2. LEDs on the left-side cover: There are 13 LEDs and a system service label
on the left-side cover. Note the lit LEDs and follow the instructions on the
system service label.
3. LEDs on the system board: To identify the component that is causing the
error, note the lit LED next to the component.
90 IBM System x3500 Type 7977: Installation Guide
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