Panasonic KX-FT21RS manual Stepping Motor Drive Circuit, Stepping Motor Phase Pattern

KX-FT21RS

6.4.5.STEPPING MOTOR DRIVE CIRCUIT

1.Function

One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized for reading or printing.

2.Circuit Operation

During motor drive, gate array IC1 pin 153 becomes a high level, and Q14 and Q7 go ON as a result. +24 V is supplied to the motor coil.

Stepping pulses are output from gate array IC1, causing driver IC7 to go ON. The motor coil is energized sequentially in 2 phase increments or 1-2 phase increments, which causes a 1-step rotation. A 1-step rotation is 0.13mm of recording paper or document paper. The timing chart is below.

Stepping Motor Phase Pattern

Function	Mode		Phase Pattern	Speed
Copy	Fine/Half Tone	1-2		217 pps
	Super Fine	1-2		108.5 pps
FAX	STD	2		217 pps
	Fine/Half Tone	1-2		217 pps
	Super Fine	1-2		108.5 pps
———	Paper Feed	2-2		434 pps

When the motor is OFF, gate array IC1 pin 153 becomes a low level and Q14 and Q7 also turns OFF. Instead of +24V, +5V is supplied through D2 so that the motor is held in place.

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