Oki Microline 3320 - CHAPTER 2 OPERATION; Precautions for Setting the Paper

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(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.
[FORWARD]
PHASE-B
[REVERSE]
PHASE-A