Mechanical
The Right Tool for the Job
During disassembly and assembly of an instrument, use the proper tool for the job. Use
of an incorrect tool can cause damage that will prevent the removal of a screw or component,
or it can cause unsightly damage such as burrs or scratches. For example, there are
at least three types of cross-point screws.
● Phillips: It is identifiable because the screw head indentation has a flat bottom, and the
driver also has a flat tip. This is the most common type of crosspoint screw.
● Pearson: It looks just like the Phillips, except that the screw head indentation has a
pointed bottom, and the driver has a pointed tip.
● Posi-Drive: The tip of the screwdriver has a convex curvature to match the screw head.
The screw head is identifiable by the extra lines between the indentations. This type of
screw is used on all Hewlett-Packard and Tektronix equipment.