DIMMs
error LEDs
25-30
DIMMs
31-42
error LEDs
DIMMs
43-48
error LEDs
Microprocessor 4
error LED
Microprocessor 3
error LED
System board
error LED
Microprocessor
and memory
expansion board
error LED
Light path
power LED
Table 21. Microprocessor and memory expansion tray LEDs
LEDs
Description
Light path power LED
When this LED is lit, it indicates that the capacitor on
the microprocessor and memory expansion tray has
sufficient power to light the error LEDs.
Microprocessor and memory expansion tray board
error LED
When this LED is lit, it indicates that the microprocessor
and memory expansion tray board has failed.
System board error LED
When this LED is lit, it indicates that an error has
occurred on the base system board.
Light path diagnostics LEDs
Use this information to diagnose possible errors that are indicated by the light path diagnostics LEDs.
The following table describes the LEDs on the light path diagnostics panel and suggested actions to correct
the detected problems. For additional information, see “Server controls, LEDs, and power” on page 19 and
the “System-board LEDs” on page 32 for the location of the system board LEDs.
Note:
Check the IMM2 event log or the system-event log for additional information before you replace a FRU.
Table 22. Light path diagnostics panel LEDs
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• See Chapter 5 “Parts listing, Lenovo System x3750 M4 Type 8753” on page 203 to determine which
components are customer replaceable units (CRU) and which components are field replaceable units (FRU).
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