Toshiba MJ-1103, MJ-1104 Front / Rear saddle stapler motor drive circuit, Initial operation

[C] Front / Rear saddle stapler motor drive circuit

The front / rear saddle stapler motor drive circuit controls the rotation and stoppage, rotational direction and motor current of the front / rear saddle stapler motor.

The front saddle stapler motor is a DC motor which is driven by rotation control signals (DM2-CNT1 and DM2-CNT0) from the CPU of the saddle control PC board, and thus this motor performs a stapling operation of the front saddle stapler.

DM2-CNT1	DM2-CNT0	Motor rotation	Remarks
L	H	Normal	Operates the stapler.
H	L	Reverse	Initial operation
			(Only when the stapler operates abnormally.)
H	H	Stop
L	L	Stop

The rear saddle stapler motor is a DC motor which is driven by rotation control signals (DM3-CNT1 and DM3-CNT0) from the CPU of the saddle control PC board, and thus this motor performs a stapling operation of the rear saddle stapler.

DM3-CNT1	DM3-CNT0	Motor rotation	Remarks
L	H	Normal	Operates the stapler.
H	L	Reverse	Initial operation
			(Only when the stapler operates abnormally.)
H	H	Stop
L	L	Stop

For the case when an overcurrent status is detected, a protection circuit is mounted to turn the front / rear saddle stapler motor off.

Saddle control PC board
	5VPA	VM
DM2/3-CNT0				DM2/3-F	Front saddle
IC31			CN6/7		stapler motor
					Rear saddle
DM2/3-CNT1	Motor drive circuit				(M18)
				DM2/3-R	stapler motor
CPU					(M19)
	Overcurrent
	protection circuit
		Fig. 3-43

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	DESCRIPTION OF OPERATIONS

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