IBM 8874 Installation Guide - Page 87
Light Path, Diagnostics - specs
UPC - 000435813008
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2. To view the light path diagnostics panel, press the release latch on the front of the operator information panel to the left; then, slide it forward. This reveals the light path diagnostics panel. Lit LEDs on this panel indicate the type of error that has occurred. Light Path Diagnostics REMIND OVER SPEC PS LINK CPU VRM LOG MEM NMI PCI SP DASD RAID NONRED TEMP FAN PCI CPU I/O BRD BRD BRD Look at the system service label on the top of the server, which gives an overview of internal components that correspond to the LEDs on the light path diagnostics panel. This information and the information in "Light path diagnostics panel" on page 77 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. Chapter 6. Solving problems 75