IBM xSeries 440 8687, Hardware Maintenance Manual

Page: 169 / 258

Level 3 light path
The level 3 light path consists of the LEDs on the top cover of the server (see the
illustration at step 2 on page 54).
Level 3 light path LED FRU/action
1 (upper SMP Expansi9on Module)
1. Check for level 4 light path LEDs on upper SMP board:
a. Disconnect server from power source; then, remove upper SMP
Expansion Module and cover.
b. Press light path capacitor switch (SW1; see “SMP Expansion Module
connectors and LEDs” on page 142).
c. Check board for lit level 4 LEDs (CPU, memory, VRM, SMP board
LEDs) (see “SMP Expansion Module connectors and LEDs” on page
142).
2. Verify that corresponding module is properly installed.
Note: If all VRM LEDs are on, check for missing or improperly installed
VRM.
3. Reseat/replace corresponding module (DIMM, VRM, or CPU).
4. Upper SMP board.
2 (lower SMP Expansion Module
1. Check for level 4 light path LEDs on lower SMP board:
a. Disconnect server from power source; remove upper SMP Expansion
Module; then, remove lower SMP Expansion module and cover.
b. Press light path capacitor switch on lower SMP board (SW1; see “SMP
Expansion Module connectors and LEDs” on page 142).
c. Check board for lit level 4 LEDs (CPU, memory, VRM, SMP board
LEDs) (see “SMP Expansion Module connectors and LEDs” on page
142).
2. Verify that corresponding module is properly installed.
Note: If all VRM LEDs are on, check for missing or improperly installed
VRM.
3. Reseat/replace corresponding module (DIMM, VRM, or CPU).
4. Lower SMP board.
3 (centerplane power)
1. If level 2 light path VRM LED is on (see the illustration at step 1 on
page 54), replace centerplane VRM.
2. Verify all cables and connectors are properly seated.
3. Centerplane.
4 (PCI-X power)
1. Check PCI-X board for (see “PCI-X board internal connectors” on page
129) for the following lit LEDs: Attention, SERR, PCI-X.
2. Check Operating System event log.
3. Run corresponding adapter card diagnostics, if available.
4. Adapter.
5. PCI-X board.
6. I/O board.
5 (Remote Supervisor Adapter)
Remote Supervisor Adapter
6 (I/O board power)
1. If level 2 light path VRM LED is on (see the illustration at step 1 on
page 54), replace I/O board VRM.
2. I/O board.
Symptom-to-FRU index
157