One Stop Systems
ExpressBox 16 Basic| 46
4.10
Backplane LEDs
4.10.1 Power Management Backplane
This backplane system controls the power distribution to the entire PCIe device. Ensure that this device is working properly by indicating that
the LEDs are ON. It is attached to the side panel within the chassis near the power supply module.
4.10.2 Backplane Power Indicator
Other than the indicators on the front panel, the backplane board that is located within the chassis contains LEDs that provide status of the
power supply.
These are located by the edge of the board on the top left.
If the power is operating in its normal condition, then the LED with the
reference designator D34 will light up. Otherwise, if there is a voltage failure (for +3.3V) the D21 LED will lit. This status must be inspected to
see whether power is an issue.
4.10.3 Activity Indicator
These LEDs tell whether data is processed correctly throughout the entire backplane. LEDs D32 and D33 indicate whether information from the
EEPROM has properly transferred the data set to the PLX PCI Express switches when the chassis is initially turned on. These LEDs should go off
after a short period. The picture on the left is shown before the host computer is turned on and the one on the right is after the host computer
is powered.
Another set of indicators that are useful to observe are D22, D29, and D30. This shows the RESET status of the backplane and the PCIe Gen 2
Switch components. D22 is the RESET status of the entire backplane and D29 and D30 is represents PCIe switches. The RESET status should turn
off (LEDs OFF) when the host computer turns on and the chassis is powered. If it does not, then the chassis is having technical difficulties and
will not see the cards that are inserted. Below are photos showing the proper status of the indicators.
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