Lenovo K4450 Laptop Hardware Maintenance Manual - Lenovo K4450 and K4450A - Page 69

Remove the screws 4 , and then remove the media card reader slot board. 4 4 5 4 Step 4 Screw (quantity) M2 × 3 mm, flat-head, nylon-coated (3) Color Black Torque 0.181 Nm (1.85 kgf-cm) 1140 System board assembly For access, remove these FRUs in order: • "1010 Battery pack" on page 48 • "1020 Bottom slot cover" on page 48 • "1030 Memory modules" on page 49 • "1040 Hard disk drive assembly" on page 51 • "1050 PCI Express Mini Card for wireless LAN" on page 52 • "1060 mSATA solid-state drive" on page 53 • "1070 Backup battery" on page 54 • "1080 Keyboard" on page 55 • "1090 Keyboard bezel" on page 57 Important notice for replacing the system board When replacing the system board, observe the following guidelines: • Do not drop a system board on a bench top that has a hard surface, such as metal, wood, or composite. • Do not apply any excessive force to a system board. • Avoid rough handling of any kind. • Avoid bending a system board or hard pushing to prevent cracking at each Ball Grid Array (BGA) chipset. • When you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated conductive surface. Chapter 8. Removing or replacing a FRU 63