Piston reset apparatus for a multichip module and method for resetting pistons in the same

A method for resetting pistons in a multichip module, the method comprising:

• providing a base including a plurality of projections;
• disposing a hat upwardly of said base, said hat including a plurality of pistons that are positionally fixed in said hat and a plurality of adjustable pistons that are vertically adjustable within said hat in a direction towards said base;
• aligning each of said plurality of adjustable pistons with one of said plurality of projections;
• holding a spring loaded sleeve having a plurality of springs with a mass equivalent plate and disposing said spring loaded sleeve and said mass equivalent plate upwardly adjacent of said hat;
• aligning each spring of said spring loaded sleeve with one of said plurality of adjustable pistons;
• clamping said base, said hat, said spring loaded sleeve, and said mass equivalent plate together via a spring loaded clamp;
• subjecting a temporary assembly of said hat, said mass equivalent plate, said base, said spring loaded sleeve, and said clamp to a furnace reflow operation;
• causing said springs of said spring loaded sleeve to apply a pressure to each of said adjustable pistons via said subjecting;
• and
• resetting said adjustable pistons to their original positions via said pressure.