Toshiba e-studio550 Service Manual page 302

(5) Drive circuit for large original exit motor, small original exit motor and tray lift motor
Since the large original exit motor, small original exit motor and tray lift motor have almost the same
circuitries, the drive circuits for the small original exit motor and tray lift motor are not described. The
following is the drive circuit for the large original exit motor.
This circuit controls the rotation/stoppage, the direction of the rotation of the large original exit motor
and the motor circuit. The drive pattern signal is input into IC2-5, 6, 16, 17pin to control the speed and
direction of the motor rotation.
The PWM signal is input into LMOT_CU and separated and smoothed at R90, R85 and C86, and it is
input into IC2-3pin(RefA) and14pin(RefB) to set the motor current value. The motor current value can
be changed by altering duties of the PWM signal.
(6) Drive circuit for disengagement solenoid, small original exit solenoid and large original exit solenoid
This circuit controls the closing/opening of the flappers of the disengagement, small original exit and
large original exit solenoids.
When the level of ESSOL, SSOL, LSOL is "H", Q9, Q10, Q11 are turned ON and the flappers are
closed. The drive signal for the disengagement solenoid is a PWM signal. The flappers are closed in the
maximum torque of the solenoids and the duty value becomes 100% when the flappers start to be
closed. After finishing closing, the duty value is decreased down to 50% and the flappers are kept
closed while the temperature rise of the solenoids is being lowered.
JUNE 2002 © TOSHIBA TEC 16 - 65 e-STUDIO550/650/810 RADF