Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 51

FRU Coverage of Fault Isolating Tools (Continued)
TABLE 2-4
FRU
Fan tray 0 (PCI fan)
Fan tray 1 (CPU fans)
Motherboard
Power supply
SCSI backplane
System configuration card reader
System configuration card
In addition to the FRUs listed in
system components—mostly cables—that cannot directly be isolated by any system
diagnostic. For the most part, you determine when these components are faulty by
eliminating other possibilities. Some of these FRUs are listed in
hints on how to discern problems with them.
FRUs Not Directly Isolated by Fault Isolating Tools
TABLE 2-5
FRU
Connector board assembly
Connector board power
cable
DVD-ROM drive cable
SCSI backplane
ALOM Enclosure
No coverage. See
TABLE 2-5
No coverage. See
TABLE 2-5
No coverage. See
TABLE 2-5
, there are several minor replaceable
TABLE 2-4
Diagnostic Hints
This is difficult to distinguish from problems with similar
symptoms. The firmware generates many error messages
about being unable to access OpenBoot configuration
variables, for example: "Could not read diag-level
from NVRAM!" ALOM shows the front panel Service
Required indicator is lit.
If ALOM is able to read the system keyswitch position, but
reports that none of the fans are spinning, you should
suspect that this cable is loose or defective.
If OpenBoot Diagnostics tests indicate a problem with the
CD/DVD drive, but replacing the drive does not fix the
problem, you should suspect (primarily) that this cable is
either defective or improperly connected, or (secondarily)
that there is a problem with the motherboard.
Though not an exhaustive diagnostic, some SunVTS tests
(i2c2test and disktest) exercise certain SCSI backplane
paths. You can also monitor the backplane's ambient
temperature using the ALOM system controller
showenvironment command (see "How to Monitor the
System Using Sun Advanced Lights Out Manager" on
page 79).
Chapter 2 Diagnostics and the Boot Process
LEDs
OpenBoot
On FRU Diags
for fault isolation hints.
for fault isolation hints.
for fault isolation hints.
TABLE 2-5
POST
, along with
33