TB8100 Service Manual Safety and Servicing Information 23
© Tait Electronics Limited September 2006
1.6 Identifying Screw Types
1.6.1 Torx Recess Head Screws
Torx recess head screws are the standard type of screw used in all TB8100
equipment, although Pozidriv and Allen recess head screws are also used in
a few special applications.
Figure 1.2 below shows a typical Torx recess head screw (actual hardware
may differ slightly from this illustration due to variations in manufacturing
techniques).
1.6.2 Allen Recess Head UNC Screws
Allen recess head 4-40 UNC thread screws are used to secure the RF power
transistors in the TB8100 power amplifier and cannot be interchanged with
M3 screws (refer to Figure 11.1 on page 197).
1.6.3 Pozidriv Recess Head Screws
Pozidriv recess head screws are used in TB8100 equipment in a few special
applications. It is important that you use the correct type and size
screwdriver to avoid damaging the screw head.
It is particularly important that you do not use Phillips screwdrivers on
Pozidriv screw heads as the tapered driving flutes of the Phillips screwdriver
do not engage correctly with the parallel-sided slots in the Pozidriv screw
head. This can result in considerable damage to the screw head if the
screwdriver tip turns inside the recess.
Figure 1.2 Identifying Torx screws
“star” shaped recess with
six internal notches
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