LOGIC CIRCUITRY

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