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Power Supply
Description Spare part number
Power supply, 300W (Active PFC; not for use in Brazil) 656721-001
689005-001
Power supply, 300W 664862-001
692096-001
WARNING! Voltage is always present on the system board when the computer is plugged into an
active AC outlet. To avoid possible personal injury and damage to the equipment the power cord
should be disconnected from the computer and/or the AC outlet before opening the computer.
NOTE: When installing a new power supply, be sure to set the red switch to the setting (230 V or
115 V) appropriate for the country in which the computer is used. Spare power supplies normally
arrive set for 230 V.
1. Prepare the computer for disassembly (Preparation for Disassembly on page 49).
2. Remove the access panel (
Access Panel on page 50).
3. Disconnect all power cables from the mass storage devices and from the system board
connectors labeled ATX_CPU and PWR.
4. From the rear of the computer, remove the four Torx screws that secure the power supply to the
chassis.
5. Inside of the unit, press the power supply release latch on the chassis base (1).
82 Chapter 7 Removal and Replacement Procedures – Microtower Chassis