IBM 8668 Hardware Maintenance Manual - Page 27

Power supply LEDs, Light Path Diagnostics panel, PCI

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You can use the Light Path Diagnostics feature built into the server to quickly identify the type of system error that occurred. The server is designed so that any LEDs that are illuminated remain illuminated when the server shuts down as long as the ac power source is good and the power supplies can supply +5 V dc current to the server. This feature helps you isolate the problem if an error causes the server to shut down. See "Diagnostic tools overview" on page 13. Power supply LEDs The ac and dc power LEDs on the power supply provide status information about the power supply. DC power LED (green) AC power LED (green) DC power LED (green) DC AC GOOD GOOD AC power LED (green) For information about interpreting these lights, see "Power supply LED errors" on page 116. Light Path Diagnostics panel The following illustration shows the LEDs on the diagnostic panel on the system board. See "Diagnostic Panel LED" on page 109 for information on identifying problems using these LEDs. MEM PS1 CPU PS2 PCI A PS3 PCI B NON PCI C OVER VRM NMI DASD TEMP SP FAN REMIND Diagnostics 19

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You can use the Light Path Diagnostics feature built into the server to quickly
identify the type of system error that occurred. The server is designed so that any
LEDs that are illuminated remain illuminated when the server shuts down as long
as the ac power source is good and the power supplies can supply +5 V dc current
to the server. This feature helps you isolate the problem if an error causes the
server to shut down. See “Diagnostic tools overview” on page 13.
Power supply LEDs
The ac and dc power LEDs on the power supply provide status information about
the power supply.
DC power
LED (green)
DC power
LED (green)
AC power
LED (green)
AC power
LED (green)
DC
GOOD
AC
GOOD
For information about interpreting these lights, see “Power supply LED errors” on
page 116.
Light Path Diagnostics panel
The following illustration shows the LEDs on the diagnostic panel on the system
board. See “Diagnostic Panel LED” on page 109 for information on identifying
problems using these LEDs.
MEM
CPU
PCI A
PCI B
PCI C
VRM
DASD
SP
PS1
PS2
PS3
NON
OVER
NMI
TEMP
FAN
REMIND
Diagnostics
19