IBM eServer xSeries 335 Type 8676, Hardware Maintenance Manual And Troubleshooting Manual

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shows the location of the level 2 diagnostic LED panel on the system board.
Level 2
diagnostic LEDs
The following illustration shows the error LEDs, light path button, and test LED on
Light Path Diagnostics panel on the system board. See “Light Path Diagnostic panel
system error LED” on page 86 for information on identifying problems using these
LEDs.
CPU
MEM
PCI A PCI B PCI C
VRM CNFG
DASD
SP PS
NON
OPT
NMI
TEMP FAN
Light Path Diagnostics™
Light path
button (SW1)
Test LED
(CR82)
If you remove the server from the rack and you are using the Light Path
Diagnostics LEDs to diagnose a problem, you can press the Light Path button to
light any LEDs that were lit before you unplugged the server.
Recovering the BIOS code
If the BIOS code has become damaged, such as from a power failure during a flash
update, you can recover the BIOS code using the flash ROM page swap jumper
(J38) and a BIOS flash diskette.
Note: Use one of the following methods to obtain a BIOS flash diskette:
v Use the ServerGuide program to make a BIOS flash diskette.
v
Download a BIOS flash diskette from the World Wide Web at
http://www.ibm.com/pc/support.
Chapter 3. Diagnostics
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