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Sun Remarketing SCSI card: A cautionary tale

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sigma7:
The ZIF design is such that if the circuit board is not fully inserted, the cam jams hard against the board. The spring force as well as the force turning the actuator puts a lot of stress on the cam which sometimes breaks it (possibly aggravated by deterioration over time and repeated jamming and bending due to the detent bump described above).

In an attempt to reduce the chance of damage, I've taken to putting a slight bevel on the end of the card edge (green oval), as well as a chamfer on the cam (blue line). Although the improvement is small, these seem to work to nudge a slightly protruding expansion card into the correct position instead of just jamming the cam.

sigma7:
Update on 3D printing a cam replacement: Replacing a broken yellow cam on a Lisa expansion card ZIF socket with 3D print

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