Fujitsu ULTIMA90 Maintenance Manual page 158

Dot matrix printer
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Figure 5.3.15 Block diagram for various motor control and drive circuits
The space motor is rotated as follows:
The MPU reads phase excitation data from ROM.
The rotation direction and initial excitation phase are set in the FPGA control register of the stepping motor
control circuit and simultaneously current specification data is written to the current specification register as
needed.
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