Appendix D
Troubleshooting
D-3
• If PCI Express data path failures are detected during initial
Power-On Self Test (POST), POST will turn off power to the
link card slot in the host. FRUs in the External I/O Expansion
Unit are detected by the host service processor during POST
but disappear when power to the slot is removed. Reseat the
link cards in the host and External I/O Expansion Unit, check
cables, or try a different PCI Express slot in the host.
Host
Host or service processor
does not recognize PCI card
or cards.
• For the optical link kit, the link cables might be reversed. The
TX socket on each link card should connect to the RX socket on
the other link card. Note that each optical cable connects a TX
socket to an RX socket.
• The PCI card might not be seated completely. Remove the card
and carrier and verify that the card is properly attached to the
carrier. See
in this table.
LEDs
• See
Appendix B
for LED information.
PSU
Fan does not turn on, LEDs
do not light.
• The PSU is not receiving DC current from the second PSU.
Note: The PSUs share DC current, so the fan and LEDs should
operate if the second PSU is running normally.
• Verify that the PSU is seated. Close the PSU handle and tighten
the handle locking screw.
The fan operates, but the
PSU does not come on line.
• The PSU might not have AC input. Note: The PSUs share DC
current, but do not share AC current. Verify that both of the
internal AC cables are connected to AC voltage through the
AC cords supplied with the External I/O Expansion Unit
(
FIGURE 2-11
).
• Check external circuit breakers.
• PSU AC switches must be in the on position.
PCI card
PCI card or carrier is difficult
to seat in the boat, or the
card moves out of position
on carrier.
• The card locks might be loose, allowing the card to tilt.
Reposition the card and tighten the card locks. It is most
important that the card lock(s) at the back
*
of the card press
tightly against the back of the card.
• Excessive pressure on the card locks might have bent the card
bracket (
FIGURE 1-21
).
• If PCI Express data path failures are detected during initial
Power-On Self Test (POST), POST will turn off power to the
link card slot in the host. FRUs in the External I/O Expansion
Unit are detected by the host service processor during POST
but disappear when power to the slot is removed. Reseat the
link cards in the host and External I/O Expansion Unit, check
cables, or try a different PCI Express slot in the host.
TABLE D-1
Troubleshooting
(2 of 3)
Area
Symptom
Comments
Summary of Contents for SPARC Enterprise M4000
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