Brother International MFC-P2000 Service Manual - Page 30

1.3.12 Scanner Motor Drive Circuit The scanner motor is controlled by unipolar constant current control. The combination of the current flow and the phase excitation method is changed by the scanner motor speed. Fig. 2-14 1.3.13 CIS Drive Circuit The current to the CIS LED is controlled by PWM. The analog signal from the CIS is input into the LC82103. Fig. 2-15 1.4 Panel Sensor PCB The following parts are on the printer panel sensor PCB. • Control panel ......1 switch, 4 lamps • Connector ...........low-voltage, high-voltage, solenoid, main motor, toner sensor, laser, polygon motor, connector for main PCB • Registration sensor 1.5 Scanner Sensor PCB / Scanner Panel PCB The following parts are on the scanner sensor PCB and scanner panel PCB. • Control panel ......4 keys, 5 lamps, 1 seven-segment LED • Document front sensor • Document rear sensor II-11