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Troubleshooting During Power-Up
1.5 Cabinet Control Logic Module
The cabinet control logic (CCL) module is located in the upper
front of the cabinet, behind the control panel. The CCL module
controls power sequencing and is wired to the control panel, DC
distribution box, LSB backplane, blower, PIUs, optional removable
media, and expander cabinets. The module has a power LED and
four PIU enable LEDs. You can see the CCL LEDs from the rear of
the cabinet when the rear door is open.
Figure 1-7
CCL Module LEDs
During power sequencing, the CCL power LED goes on to indicate that
power is present on the module. A PIU LED goes on to indicate that a PIU
is present in the quadrant and that its power regulators are enabled. Fig-
ure 1-8 shows the troubleshooting steps for the CCL module.
BXB-0044B-92
Power
LED
PIU 1
PIU 2
PIU 3
PIU 4
PIU 4
Quadrant 4
PIU 3
Quadrant 3
PIU 2
Quadrant 2
PIU 1
Quadrant 1
Rear
Front
Rear