Rf Motor Drive Circuit - Epson DFX 8500 Service Manual

DFX-0500
2.3.6 RF Motor Drive Circuit
Figure 2-24 shows a block diagram of the RF motor driie circuit, and Table 2-10 provides the RF motor
specifications. The RF motor is a stepping motor. The control circuit performs open-loop phase switching
control according to the timing data for acceleration, constant speed, and deceleration. CPU ports PGlO to
PG13 output the motor phase switching signals. The control method is not equipped with a hold circuit for
changing the motor phase. The RF motor rotates when the carriage moves.
Fl
PGlO
Th4P95CO61A Pal
(Ic2) PO12
PG13
.a -f?FA
bQM
------+RFB
F7l=MOkU
bQ24 -RFc
'a25 -WD
PNP Trandbxvl
Figure 2-24. RF Motor Drive Circuit Block Diagram
2-30
Rev. A