IBM 88643RU Service Guide - Page 119

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diagnostics panel. This information and the information in "Light path diagnostic LEDs" on page 104 can often provide enough information to correct the error. 3. Remove the server cover and look inside the server for lit LEDs. Certain components inside the server have LEDs that will be lit to indicate the location of a problem. For example, a VRM error will light the LED next to the failing VRM on the microprocessor tray. The following illustration shows the LEDs and connectors on the microprocessor tray. Light path diagnostics button Fan 6 Fan 2 Memory card 1 Memory card 2 Memory card 3 Fan 3 Fan 8 Fan 7 Fan 5 Memory card 4 Fan 1 Microprocessor card error LED Fan 4 Microprocessor 1 socket 1 2 4 3 Microprocessor 3 VRM connector Microprocessor 4 VRM connector Microprocessor 2 socket Microprocessor 1 error LED Microprocessor 2 error LED VRM 4 error LED VRM 3 error LED Microprocessor 3 error LED Microprocessor 3 socket Microprocessor 4 error LED Microprocessor 4 socket The following illustration shows the LEDs on the PCI board. PCI attention LEDs PCI power LEDs Power good LED Chapter 5. Diagnostics 103

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diagnostics
panel.
This
information
and
the
information
in
“Light
path
diagnostic
LEDs”
on
page
104
can
often
provide
enough
information
to
correct
the
error.
3.
Remove
the
server
cover
and
look
inside
the
server
for
lit
LEDs.
Certain
components
inside
the
server
have
LEDs
that
will
be
lit
to
indicate
the
location
of
a
problem.
For
example,
a
VRM
error
will
light
the
LED
next
to
the
failing
VRM
on
the
microprocessor
tray.
The
following
illustration
shows
the
LEDs
and
connectors
on
the
microprocessor
tray.
Microprocessor 4
VRM connector
Microprocessor 3
VRM connector
Microprocessor card
error LED
Microprocessor 4 socket
Microprocessor 3 socket
Microprocessor 3 error LED
VRM 3 error LED
VRM 4 error LED
Microprocessor 4 error LED
Microprocessor 2
error LED
Microprocessor 1
error LED
Microprocessor 1
socket
Microprocessor 2
socket
Fan 4
Fan 8
Fan 3
Fan 7
Fan 6
Fan 2
Fan 5
Fan 1
Memory
card 1
Memory
card 2
Memory
card 3
Memory
card 4
Light path diagnostics
button
1
2
4
3
The
following
illustration
shows
the
LEDs
on
the
PCI
board.
PCI attention LEDs
PCI power LEDs
Power good LED
Chapter
5.
Diagnostics
103