IBM 88614RX Maintenance Manual - Page 29

Microprocessor LEDs, Lift the microprocessor-tray release latch see Installing a microprocessor

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3. Look inside the server, if necessary. 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 assembly. Light path diagnostics LEDs for DIMMs and fans must be viewed from inside the server and will not be lit unless the serv.er is connected to a power source, although the server does not have to be turned on to view these LED. The LEDs for microprocessors and VRMs are viewed by removing the microprocessor-tray assembly. The following sections describe the procedures to follow to view the LEDs on the microprocessor-tray assembly and memory board. Microprocessor LEDs Complete the following steps to view the microprocessor LEDs: 1. Turn off the server and any peripheral devices; then, disconnect all external cables from the server. 2. Slide the server out of the rack cabinet. 3. Remove the fans (see "Replacing a hot-swap fan" on page 55) and memory cassette (see step 4 on page 46). 4. Remove the microprocessor tray: a. Lift the microprocessor-tray release latch (see "Installing a microprocessor" on page 44). b. Open the microprocessor-tray levers. c. Pull out the microprocessor tray. Microprocessor 3 VRM error LED Light-path diagnostics button Microprocessor 4 VRM error LED Microprocessor 3 VRM connector Microprocessor 4 VRM connector Microprocessor 1 socket Microprocessor 1 error LED Microprocessor 2 error LED Microprocessor 4 socket Light-path test LED Microprocessor 4 error LED Microprocessor 3 socket Microprocessor 2 socket Microprocessor 3 error LED 5. Press and hold down the light-path diagnostics button on the microprocessor board. The LEDs will be lit while the button is pressed. You can light the LEDs for a maximum of 2 minutes, after which power is no longer available for the LEDs. Note: You can press the light-path diagnostics button to relight the light path diagnostics LEDs that are lit on the microprocessor tray without ac Chapter 3. Diagnostics 19

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3.
Look inside the server, if necessary. 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
assembly.
Light path diagnostics LEDs for DIMMs and fans must be viewed from inside the
server and will not be lit unless the serv.er is connected to a power source,
although the server does not have to be turned on to view these LED. The LEDs for
microprocessors and VRMs are viewed by removing the microprocessor-tray
assembly. The following sections describe the procedures to follow to view the
LEDs on the microprocessor-tray assembly and memory board.
Microprocessor LEDs
Complete the following steps to view the microprocessor LEDs:
1.
Turn off the server and any peripheral devices; then, disconnect all external
cables from the server.
2.
Slide the server out of the rack cabinet.
3.
Remove the fans (see “Replacing a hot-swap fan” on page 55) and memory
cassette (see step 4 on page 46).
4.
Remove the microprocessor tray:
a.
Lift the microprocessor-tray release latch (see “Installing a microprocessor”
on page 44).
b.
Open the microprocessor-tray levers.
c.
Pull out the microprocessor tray.
Light-path
diagnostics button
Light-path
test LED
Microprocessor 4
VRM error LED
Microprocessor 3
VRM error LED
Microprocessor 4
VRM connector
Microprocessor 3
VRM connector
Microprocessor 4
socket
Microprocessor 3
socket
Microprocessor 2
socket
Microprocessor 1
socket
Microprocessor 1
error LED
Microprocessor 4
error LED
Microprocessor 2
error LED
Microprocessor 3
error LED
5.
Press and hold down the light-path diagnostics button on the microprocessor
board. The LEDs will be lit while the button is pressed. You can light the LEDs
for a maximum of 2 minutes, after which power is no longer available for the
LEDs.
Note:
You can press the light-path diagnostics button to relight the light path
diagnostics LEDs that are lit on the microprocessor tray without ac
Chapter 3. Diagnostics
19