Printronix P9012, Maintenance Manual

Page: 36 / 256

2–18 Principles of Operation
Mechanism Control Unit (MCU) PCBA
(Figure 2–14 and Figure 2–15)
The mechanism control unit (MCU) PCBA controls the printer mechanism
through signals sent to the hammer driver and mechanism driver PCBAs.
The board is controlled by a microprocessor. It contains three sections of
memory, timers and control ports in order to control hammer firing, shuttle
motion, ribbon movement, and paper feed. It receives instructions and
commands from the DCU and communicates status and fault information
back to the DCU.