Epson LQ 1050 Technical Manual - Page 89
unipolar, Rotat - driver
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REV.-A Carriage Motor Excitation System The carriage motor is controlled by the carriage motor constant current drive circuit. The phases of the carriage motor are controlled by CRA - CRD of the gate array (IC3A: E05A 15GA). Two drive systems, 2-2 phase and 1-2 phase excitation, are used. Because the carriage motor has one driving transistor per winding (unipolar drive), two drivers become active in the 2-2 phase excitation system and one and two drivers become active alternately in the 1-2 phase excitation system. Figure 2-37 shows the carriage motor drive sequences. ON "c OFF 1 I i I I I 1 1 OD OFF "N 1. I I I 1 I s+- ~ 12 3 415 6 7 8 1 Rotat ion C.c. w ~ C.w (Carriage moves left to right. I (a) 2-2 Phase Excitation (ICIA ) 0 ON c)' ' : : I OFF "c ON "FF " D 'N OFF 1 I I I I I I I I I I I step ~ 1 2 3 4 5 6 7 811 Rotat Ion C.c. w ~ C.w (Carriage moves left to right. ) (b) 1-2 Phase Excitation Figure 2-37. Carriage Motor Drive Sequence 2-45