Toshiba e-STUDIO520 Service Manual page 412

3) Drive circuit for read motor (M36)
This circuit controls the rotation/stoppage and the direction of rotation, excitation mode and motor
current of the read motor (M36).
A drive clock signal (RMOT_CLK) and rotation direction signal (RMOT_CWB) are input to control
the speed and direction of the motor rotation. M1 and M2 are the exciting mode setting signals.
The PWM signal of RMOT_CU is separated and smoothed at R101, R80, R42, R76, C140 and C91,
and it is input into IC10-19 pin (Vref) to set the motor current value. The motor current value can be
changed by altering duties of the PWM signal.
4) Drive circuit for document feed motor (M37), large original exit motor (M39), small original exit motor
(M40) and tray lift motor
Since the document feed motor, large original exit motor, small original exit motor and tray lift motor
have almost the same circuitries, only the drive circuit for the document feed motor is described as
follows.
This circuit controls the rotation/stoppage, the direction of the rotation of the document feed motor
(M37) and the motor current. The drive pattern signal is input into IC15-5, 6, 16, 17 pin to control the
speed and direction of the motor rotation.
The PWM signal is input into KMOT_CU and separated and smoothed at R102, R103, R89, R87
and C89, and it is input into IC15-3 pin (RefA), -14 pin (RefB) to set the motor current value. The
motor current value can be changed by altering duties of the PWM signal.
e-STUDIO520/600/720/850 REVERSING AUTOMATIC DOCUMENT FEEDER (RADF)
Fig.16-96
Fig.16-97
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March 2005 © TOSHIBA TEC