System-Board Leds And Controls - IBM System x3500 Installation And User Manual

2. Any system-board switch or jumper block that is not shown in the illustrations in

System-board LEDs and controls

Any error LED can be lit after ac power has been removed from the system-board
tray so that you can isolate a problem. After ac power has been removed from the
system-board tray, power remains available to these LEDs for up to 90 seconds. To
view the error LEDs, press and hold the light path button on the system board to
light the error LEDs. The error LEDs that were lit while the system-board tray was
running will be lit again while the button is pressed. The following illustration shows
the LEDs and controls on the system board.
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IBM System x3500 M4 Type 7383: Installation and User's Guide
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