Main Frame - Lenovo ThinkCentre M90a Pro Gen4 Hardware Maintenance Manual

• "Side I/O bezel" on page 74.
• "Right bezel" on page 74.
Removal procedure
Screw (quantity)
SCRW M3 XL10-STEP(5)

Main frame

Prerequisite
Before you start, read Generic Safety and Compliance Notices, and print the following instructions.
For access, remove the following parts in order, if any:
• "Computer stand" on page 51.
• "Rear I/O cover" on page 54.
• "System board shield" on page 55.
• "OSD button and OSD bracket" on page 56
• "VESA mount bracket" on page 57.
• "Cover presence switch (intrusion switch)" on page 58.
• "Hard disk drive" on page 59.
• "Optical drive" on page 59.
• "M.2 solid-state drive" on page 61.
• "Thunderbolt card" on page 62
• "Memory module" on page 63.
• "Wi-Fi card and Wi-Fi card shield" on page 64.
• "Card reader board" on page 64.
• "GPU card" on page 65.
• "System fan" on page 66.
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M90a Pro Gen4 Hardware Maintenance Manual
Torque
3 ± 0.5 lb/in