Light Path Diagnostics Panel - IBM 88625RX Installation Manual

2. Note that the MEM LED on the light path diagnostics panel is lit; one of the
3. Open the cover and locate the lit LED beside the defective DIMM.
4. Follow the instructions in "Installing memory modules" on page 9 to remove and

Light path diagnostics panel

The following illustration shows the LEDs on the Level 2 Light Path Diagnostics
panel, which is on the side of the operator information panel.
For more information about the Light Path Diagnostics feature, see the Hardware
Maintenance Manual and Troubleshooting Guide. The following table describes the
LEDs on the Light Path Diagnostics panel.
Notes:
1. The server requires replaceable voltage regulator modules (VRMs) with
2. The server supports a maximum of two power supplies.
DIMMs in the memory cassette is defective.
Note: The lit LEDs light the connector retaining clips; look for a lit retaining clip
to identify a failed DIMM.
replace the DIMM.
PS1 TEMP VRM PCI
PS2 FAN CPU MEM
Light Path
Diagnostics
panel LED Description
PS1 Power supply number 1 failure
PS2 Power supply number 2 failure
TEMP System over temperature condition
FAN Hot-swap fan or power-supply fan failure
VRM VRM failure
CPU Microprocessor failure
PCI PCI failure
MEM Memory failure
DASD Hard disk drive failure
NR Nonredundant power mode
NMI Nonmaskable interrupt
SP Remote Supervisor Adapter II failure
EXP Attached expansion I/O failure
LOG See event log or Remote Supervisor Adapter II log for non-optimal
condition information
OVER SPEC Power supplies being overdriven
REMIND button Press to invoke remind mode
microprocessors 3 and 4.
DASD NMI EXP OVER SPEC
NR SP LOG REMIND
Chapter 6. Solving problems
57