TM 11-7025-210-23
2-4. LOGIC CIRCUITRY
The main electronic logic module is mounted in the bustle assembly (fig. 2-12). It contains large scale integrated circuits
on printed wire boards.
Figure 2-12. Bustle Assembly
a. Mother Board (LMB/16). The mother board (LMB/16), located on the back of the bustle assembly, is a back-
plane board into which the bustle circuit boards are connected.
b. High Voltage Switcher Boards (HVS/6). The two high voltage switcher boards (HVS/6) in the bustle are
identical and interchangeable. They are installed in the even HVS and odd HVS bustle positions and control voltages used
for firing all of the even and odd hammers. The HVS boards provide protection against overcurrent or overvoltage to
protect the hammer coils.
2-9
