3-2
Service Manual PRELIMINARY
3.1
Troubleshooting with LEDs
During power-up, reset, initialization, or testing, diagnostics are run on CPUs,
memories, I/O bridges, and the PCI backplane and its imbedded options. The
following sections describes possible problems that can be identified by checking
LEDs. Unfortunately LEDs on the CPU module cannot be seen, the only LEDs
available are on the system motherboard.
Figure 3-1 System Motherboard LEDs
System Motherboard
PKW0504G-97
LEDs
IOD0 Pass
IOD1 Pass
Fan Fault
Temp OK
