User`s guide

Table 4–2 EMU Control Panel LEDs/Switches and Description of Errors
When the ... Is ... The subsystem ...
System OK (green) LED
Shelf Fault (amber) LED
Blower 1 through 8 (amber) LEDs
Temperature (amber) LED
Audible Alarm switch
ON
OFF
OFF
OFF
OFF
Is in the normal operating state.
Audible Alarm ON Has a failed FRU. Check the EMU control panel LEDs to
determine which FRU has failed.
System OK (green) LED OFF Has a failed FRU and one or more of the following error
conditions exist:
• The temperature is above the maximum safe operating
level.
• The +12 V dc power supply output is out of regulation
• The +5 V dc power supply output is out of regulation
• Fewer than four power supply SBBs are operational
ANY blower LED ON Has an individual blower failure.
Blower 1, 2, 3, and 4 (amber) LEDs ON Has one of the four blowers either not installed or not
connected.
Blower 5, 6, 7, and 8 (amber) LEDs ON Has one of the four blowers either not installed or not
connected.
Temperature (amber) LED ON Operating temperature is too high. The blowers will
operate at high speed to reduce the temperature.
Shelf Fault (amber) LED ON Has one or more of the following faults:
• A power supply SBB has failed (verify if any individual
power supply SBB LEDs are off to confirm)
• Fewer than four power supply SBBs are operational.
4–4 Error Analysis and Fault Isolation