Panasonic KX MC6020 Service Manual - Page 61
ADU Automatic Duplex Unit Option Motor Drive Circuit, 7.3.1., Motor Current Control Circuit
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KX-MC6020HX 6.7.3. ADU (Automatic Duplex Unit (Option)) Motor Drive Circuit General ADU (Automatic Duplex Unit (Option)) motor drive circuit consists of motor current control circuit as well as Scanner motor. 6.7.3.1. Motor Current Control Circuit 1. Circuit explanation According to the print speed, each motor current is controlled for appropriate value. When print speed is low, motor current is decreased to prevent the vibration during motor rotation. When print speed is high, motor needs much driving force. so much current should be supplied. For the control of motor current, Vref voltage of each motor drive is controlled. When Vref voltage is high, motor current is increased, and the voltage is low, motor current is decreased. In order to control of Vref voltage, PWM pulse is supplied from IC300 pin AP30 . PWM pulse is inverted by Q501 and integrated by R516, R517, and C505, then converted to DC voltage. This DC voltage is supplied to Vref pin of each motor drive through Q502. When duty of PWM pulse is high, Vref voltage is decreased and when duty is low, Vref voltage is increased. When print speed is high (21ppm), ADU motor current is controlled approx. 0.45A. When print speed is low (8ppm), ADU motor current is controlled approx. 0.35A. 2. Circuit diagram 61
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