Rice Lake Okidata 320-390-420 Turbo - Service Guide - Manual (Page 22)

(3) LF motor control
The LF motor driver (MTD2005F) drives the LF motor in two-phase or 1-2 phase bipolar, based on the
phase changeover data and the output current data from the LSI.
The data from the LSI is processed by a specific register contained in the LF motor driver to measure the
overdrive time and to change the phase.
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