Replacing The Front And Rear Fan Assemblies; Removing A Memory Module; Installing The Memory Module - Lenovo ThinkStation 4157 Hardware Installation And Replacement Manual

3. Remove the memory module being replaced by opening the retaining clips.
Figure 37. Removing a memory module
4. Position the replacement memory module over the memory slot. Make sure the notch
module aligns correctly with the slot key
down into the slot until the retaining clips close. See "Installing a memory module" on page 13.
Figure 38. Installing the memory module
5. Go to Chapter 4 Chapter 4 "Completing the parts replacement" on page 47.

Replacing the front and rear fan assemblies

Attention: Do not open your computer or attempt any repair before reading and understanding the "Important safety
information" in the ThinkStation Safety and Warranty Guide that came with your computer. To obtain a copy of the
ThinkStation Safety and Warranty Guide, go to:
http://support.lenovo.com
This section provides instructions on how to replace the front and rear fan assemblies.
To replace the rear fan assembly:
1. Remove the computer cover. See "Removing the computer cover" on page 11.
2. Locate the fan assembly that you want to replace. Your computer has one front fan assembly and one
rear fan assembly. See "Locating internal components" on page 7.
2
on the system board. Push the memory module straight
.
Chapter 3 Installing options and replacing hardware
1
on the memory
41