Inspiron 3891 Service Manual

Removing the power-supply unit

1. Lay the computer with its left side facing up.
2. Remove the three screws (6-32) that secure the power supply to the chassis.
3. Disconnect the power-supply unit cables from the system board.
   NOTE The power-supply unit cables are connected to the system board at two locations and supply power to the following components at the two locations:

   • Processor
   • System board
4. Remove the power-supply cables from the routing guides on the chassis.
5. Press down on the securing clip to release the power supply from the chassis.
6. Slide and lift the power supply from its slot on the chassis.