Lenovo 20QT, Hardware Maintenance Manual, Page: 83 / 115

1130 System board assembly and side USB connectors
Important notices for handling the system board
When handling the system board, read the following:
• The system board has an accelerometer, which can be broken when several thousands of G-forces are
applied.
Note: Dropping a system board from a height of as little as six inches so that it falls flat on a hard bench
can subject the accelerometer to as much as 6000 G's of shock.
• Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or
composite.
• Avoid rough handling of any kind.
• At every point in the process, be sure not to drop or stack the system board.
• If 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 material.
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 63
• “1020 M.2 solid-state drive” on page 64
• “1030 Wireless-LAN card” on page 65
• “1050 Built-in battery” on page 67
• “1060 Thermal fan assembly” on page 69
• “1110 dc-in bracket and dc-in cable” on page 74
Attention: The microprocessor soldered on the system board is extremely sensitive. When you service the
system board, avoid any kind of rough handling.
Removal steps of the system board assembly
Chapter 8
.
Removing or replacing a FRU
77