Oki OKIFAX 5750 Service Manual page 843

(3) Registration motor
(4) Drive control
Time T0 to T3 determines the motor speed, while the difference of phase direction between phase signals DMPH1-P and DMPH2-P (RMPH1-P and RMHPH2-P)
determines the rotation direction, DMON1-N signals control a motor coil current. According to the polarity of the phase signal, the coil current flow as follows:
1) +38V motor coil
2) +38V motor coil
The voltage drop across the resistor is input to comparator, where it is compared with a reference voltage. If an overcurrent flow occurs, a limiter operates to
maintain it within a certain fixed amount of current.
resistor earth, or,
resistor earth