Service manual

Principles of Operation

Paper feed motor specifications

4-phase, 48pole stepper motor

Drive Voltage

VDC + 10%

Coil Resistance

58 ohms f 7% at 77O F (25O C)

Phase Excitation

2-2 phase excitation

Current

1.1 A, maximum (rush current)

Driving:

0.30

A, typical

Holding:

0.06 A

Driving Frequency

400

pulses per second

Paper feed motor drive circuit

Figure 2-43 shows the paper feed motor drive circuit. When the paper feed signal

PB2

goes LOW,

Q27

goes on and supplies +24 V to the motor. When the paper

feed motor is not being driven (when it is in hold status), +5 V is supplied to the

motor via resistor R36 and diode Dll.

Figure 2-43. Paper Feed Motor Drive Circuit

LC&200/AP3000

2-45