Step Screw (Quantity); Color Torque Black; 4.0 Kgf-Cm - Lenovo B490 Hardware Maintenance Manual

Removal steps of keyboard
1
Remove the screws .
When installing: Ensure that the screws have been fastened to secure the keyboard.
Step Screw (quantity)
1
M2.5 × 8 mm, flat-head, nylon-coated (3)
Push hard in the direction shown by the arrow
When installing: Ensure that the keyboard connector is attached firmly.
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Hardware Maintenance Manual
2 to unlatch the front side of the keyboard.
Color Torque
Black

4.0 kgf-cm