User's Manual
MacBook (13-inch) Additional Procedures— Darfon Keycaps — 291
3. Test the operation of the scissor mechanism by using a black stick to carefully raise and lower
the mechanism.
• If it is installed correctly, the scissor should move smoothly.
• If it is loose, remove it and compare the two parts of the scissor mechanism to the image below.
- The inner piece should pivot smoothly within the outer piece.
- When closed, its prole should be fully at.
- The slider bar and all four pins should be intact.