User's Manual

M889-00

Introduction To Servicing 3.5

3.2 Mechanical

3.2.1 Pozidriv Recess Head Screws

Pozidriv recess head screws are the preferred standard on all Tait manufactured equip-

ment. The very real advantages of this type of screw will not be realised unless the cor-

rect screwdrivers are used by servicing personnel.

3.2.2 UNC Thread Screws

All black finish Pozidriv screws used in the T889 are 4-40 UNC thread and cannot be

interchanged with M3 screws. Note that different lengths are used in different applica-

tions.

3.2.3 Screw Torques

It is important to tighten the cover and power transistor securing screws to the correct

torque to ensure that the T889 maintains its specified performance.

We recommend the following torque settings:

cover screws .. 6lb-in./0.7Nm

power transistors .. 6lb-in./0.7Nm

3.2.4 Disassembly/Reassembly

The power output level setting procedures should be carried out with the cover on.