IBM 7163, Problem Determination And Service Manual

Page: 128 / 210

Note: If the information LED is lit and no other LEDs are lit, the server might
be running with nonredundant power. Two power supplies at 110 V ac can
support a fully configured server but do not supply redundancy.
v If the system-error LED is lit, it indicates that there is a fault or condition in
the server and that light path diagnostics might light an additional LED to help
diagnose the problem.
The following illustration shows the operator information panel.
Power-control button
Power-on LED
USB connectors
Hard disk drive activity LED
Information LED
System-error LED
Locator LED
Release latch
2. To view the light path diagnostics panel, press the release latch on the front of
the operator information drawer to the left; then, slide it forward. Note any LEDs
that are lit, and then close the drawer.
DASD
NMI
PCI
SP
PS2
CNFG
MEM
CPU
FAN
OVER SPEC
TEMP
REMIND
S ERR
Light Path
Diagnostics
PS1
BRD
RAID
3. Remove the top cover to look inside the server for lit LEDs. To identify the
component that is causing the error, note the lit LED on or next to the
component. For example, a microprocessor/memory card error will light the LED
on top of the microprocessor/memory card.
The following illustration shows the LEDs and connectors on the I/O board.
112
IBM System x3755 Type 8877 and 7163: Problem Determination and Service Guide