Epson TM U200D Technical Reference - Page 67

Motor, paper feed drive circuit The Motor, paper feed (stepping motor) possesses an accurate angle of rotation and permits speed control. It is driven with 2-2 phase excitation. By turning P53 of the CPU to Low, +24V (+24C signal in the figure below) is applied to the COM terminal of its coil, and it is made to run by changing P90, P91, P92 and P93 to High and Low. Its speed is determined by the speed of changing P90, P91, P92 and P93 between High and Low. At the end of paper feeding, P53 of the CPU is once again set to High. U5 P90/M10 56 P92/M12 58 P91/M11 57 59 P93/M13 +24C PF A/DSW5 Q19 PF C/DSW7 PF B/DSW6 Q21 PF D/DSW8 +5V Q18 +5V D35 Q20 D33 RM2 7 8 5 6 3 4 D34 1 2 D37 QM4 1 8 9 6 7 4 5 2 3 1 D10 0 +24C CN6 11 22 33 44 55 Paper feed motor PF A PF C PF COM PF B PF D (ROTOR) Figure 2-25 Motor, paper feed drive circuit Motor, carriage drive circuit The Motor, carriage (stepping motor) possesses an accurate angle of rotation and permits speed control. It is driven with 2-2 phase excitation. By turning P52 of the CPU to Low, +24V (+24B signal in the figure below) is applied to the COM terminal of its coil, and it is made to run by changing P20, P21, P22 and P23 to High and Low. Its speed is determined by the speed of changing P20, P21, P22, and P23 between High and Low. At the end of paper feeding, P52 of the CPU is once again set to High. +24B U5 P20/M00 52 P22/M02 54 P21/M01 53 55 P23/M03 CR A/DSW1 Q15 CR C/DSW3 CR B/DSW2 Q17 CR D/DSW4 +5V Q14 D29 Q16 D30 RM1 7 8 5 6 3 4 D31 1 2 D36 +24B D9 QM3 1 8 9 6 7 4 5 2 3 1 0 CN5 11 22 33 44 55 Carriage motor CR A CR C CR COM CR B CR D (ROTOR) Figure 2-26 Motor, carriage driving circuit 2-26 Mechanism Configuration and Operating Principles Rev.B