Lenovo 6423 Installation Manual page 35

6. Depress the power supply latch 1 . Slide the power supply assembly toward
the front of the computer, remove it from the chassis.
Figure 16. Removing the power supply
7. Install the new power-supply assembly into the chassis so that the screw holes
in the power-supply assembly align with those in the chassis.
Note: Use only the screws provided by Lenovo.
8. Install and tighten the four screws at the rear of the chassis to secure the
power-supply assembly.
9. Ensure that the power supply is the correct replacement. Some power supplies
auto sense the voltage, some power supplies are voltage specific, and some
power supplies have a voltage selection switch. If there is a selection switch
use a ballpoint pen to slide the switch, if necessary.
Note: For models that have a switch:
v If the voltage supply range is 100–127 V AC, set the switch to 115 V.
v If the voltage supply range is 200–240 V AC, set the switch to 230 V.
10. Reconnect all the power supply cables to the drives, adapters, and the system
board. Make sure to reconnect power to the graphics cards that require an
additional cable.
11. Go to Chapter 4, "Completing the parts replacement," on page 43.
Chapter 3. Installing options and replacing hardware
27