IBM 8685 Hardware Maintenance Manual - Page 44

Hot-swap fan Release latch Power supply Release latch AC power LED DC power LED Handle (open position) The following table describes the ac and dc power LEDs. For more information about the ac and dc power LEDs, see "Power-supply LED errors" on page 146. Light Path Diagnostics You can use the Light Path Diagnostics feature built into your server to quickly identify the type of system error that occurred. Your server is designed so that LEDs remain illuminated when the server shuts down, as long as the power supplies are operating properly. This feature helps you to isolate the problem if an error causes the server to shut down. Diagnostic panel LEDs The following illustration shows the location of the error LEDs and the Remind button on the Light Path Diagnostics panel. See "Diagnostic panel system error LED" on page 132 for information on identifying problems using these LEDs. NMI ISMP LOG MEMORY D1 D7 PCIA PCIB PCIC PCID DASD D2 D8 PS1 PS2 CPU VRM TEMP D3 D9 PS3 PS4 FAN OVER NON D4 SPEC REDUND Light Path Diagnostics™ D5 D10 D11 REMIND D6 D12 Notes: 1. If the memory is configured for 2-way or 4-way memory interleaving and a single DIMM fails, the lights for all of the interleaved DIMMs on that bank will be lit. See "Memory errors" on page 36. 34 xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide