Epson DFX-8500 service manual RF Motor Drive Circuit, RF Motor Specifications

DFX-8500

2.3.6 RF Motor Drive Circuit

Figure 2-24 shows a block diagram of the RF motor drive 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 PG10 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.

	Table 2-10. RF Motor Specifications
Specification		Description
Form		4-phase, 48-pole, PM pulse motor
Supply Voltage		37 VDC (applied to the drive circuit)
Internal Coil Resistance		150 ohms + 10 % per phase at 25 oC
Frequency		720 pps
Current Consumption		Driving: 0.10 A (average)
Driving Method		Constant voltage driving, 2-2 phase drive

			VP 3
	MAIN	DRV
	Board	Board	F1
E05B36
(IC1)	RFCOM		Q20,Q21	RF COM
	PG10		Q22	RF A
			Q23
TMP95C061A	PG11			RF B
(IC2)	PG12		Q24	RF C
	PG13		Q25	RF D

RF Motor

PNP Transistor x4

Figure 2-24. RF Motor Drive Circuit Block Diagram

2-30 Rev. B