Servicing the 7x20 Controller
■
Vertical PDB Card: The vertical power distribution board, or Paddle Card is a FRU and
serves as the interconnect between the power distribution board and the fan power boards,
hard drive backplane, and I/O board.
■
Power Supply Backplane Card: This board connects the power distribution board to
power supplies 0 and 1.
■
Fan Power Boards: The two fan power boards are FRUs and carry power to the storage
controller fan modules. In addition, they contain fan module status LEDs and transfer I2C
data for the fan modules.
■
Drive Backplane: The six-drive backplane is a FRU and includes the connectors for the
drives, as well as the interconnect for the I/O board, Power and Locator buttons, and system/
component status LEDs. Each drive has an LED indicator for Power/Activity, Fault, and
Locate.
7420 Internal Components
The controller components are shown in the following figure and identified in the table.
FIGURE 39
7420 Controller Components
Servicing the Hardware 161
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