Lenovo 30BH User Manual page 101

DANGER
Disconnect all power cords from electrical outlets before removing the computer cover or any part
that has the above label attached.
DO NOT disassemble components that have the above label attached. There are no serviceable parts inside
these components.
Your product is designed for safe use. However, hazardous voltage, current, and energy levels are present
inside any component that has this label attached. Disassembling of these components might cause fire or
might even result in death. If you suspect a problem with one of these parts, contact a service technician.
To replace the power supply assembly, do the following:
1. Prepare your computer. See "Preparing your computer and removing the computer cover" on page 57.
2. Disconnect the power supply assembly cables from the system board and all drives. See "Parts on the
system board" on page 5.
3. Release the power supply assembly cables from the cable clips and ties.
4. Lay the computer on its side and remove the four screws at the rear of the chassis that secure the power
supply assembly. Then slide the power supply assembly to the front of the computer and then lift it out
of the chassis.
Figure 71. Removing the screws for the power supply assembly
5. Ensure that the new power supply assembly is the correct replacement.
6. 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.
7. Install and tighten the four screws to secure the power supply assembly.
Note: Use only screws provided by Lenovo.
8. Connect the power supply assembly cables to the system board and each of the drives.
9. Secure the power supply assembly cables with the cable clips and ties in the chassis.
.
Chapter 7 Hardware removal and installation
89