Lesson 2/Learning Event 2
c. Differences in Types of Main Frames. Improvements have been made in
main-frame design to incorporate self-restoring protectors and wire-wrap
themselves to normal when the cause for their operation has been
from the line.
This design quickly restores the line to traffic
the attention of a testman.
(2) Wire-wrap terminals.
New wiring methods include wrapping wire
around terminals rather than soldering. Since the wrapping is performed by
machine, all wire-wrapped connections exhibit uniform characteristics.
Further, the operation saves time, and ends circuit failures caused by
solder beads and clipped wire ends.
The terminals differ in basic design
terminal boards. A tool similar to a small electric drill does the wrapping
quickly and accurately.