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6-5
Power Supply
The 7043M-8/7043M-6 has a single 450 watt redundant cooling power supply.
The redundant cooling function is provided by two fans. The primary fan operates
continuously and the secondary fan (along with an alarm and an LED) activate
if either 1) the primary fan fails or 2) a temperature threshold is exceeded. If the
primary fan fails, the power supply should be replaced as soon as possible. You
must power down the system to replace the power supply. The power supply has
an auto-switching capability that enables it to automatically sense and operate
with either 100 or 240 volt inputs. The power supply is PFC (Power Factor
Correction) compliant.
Power Supply Failure
If the primary power supply fan fails an audible alarm will notify you of a
power unit failure. Disable the alarm by pressing the alarm reset switch on
the back of the power supply. The PWR Fail LED and the LED on the back of
the power supply will also illuminate and remain on (until the failed unit has
been replaced).
Replacing the Power Supply
1.
Accessing the power supply:
After powering down the system, you'll need to remove the left/top
chassis cover to access the power supply for removal.
2.
Removing the power supply:
First, unplug the power cord from the power supply. Then remove the
power supply connectors going to the motherboard and the SCSI
backplane. Finally, remove the screws that secure the unit to the mount-
ing brackets in the chassis and then pull the unit completely out.
3.
Installing a new power supply module:
Replace the failed unit with another unit having the exact same part
number (SC742S-450). Gently but firmly push the new unit all the way
into the open bay. Secure it to the mounting brackets in the chassis with
the screws provided. Connect the two power cables to the SCSI
backplane and the two to the motherboard (ATX PWR CONN and J15
connectors). Finish by replacing the chassis left/top cover and then
restoring power to the system.
Chapter 6: Advanced Chassis Setup
6-9
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