Epson TM U200D - B/W Dot-matrix Printer, Техническое руководство

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2-4 Mechanism Configuration and Operating Principles Rev.B
Printing a character (9x9 font)
A character is printed by energizing the print solenoids with respect to the Carriage sub-ass’y
portion (the reference timing for the print solenoids is the Motor, carriage phase switching
signals). The print head unit is moved 0.317 mm (0.012”) (in approximately 1.05 ms) each time
the Motor, carriage is rotated one step (7.5°).
To print character “2,” print solenoids 2 and 9 are energized first at the same timing as the
Motor, carriage phase switching signal. Then, print solenoid 8 is energized at TnH (being
delayed a half dot). The remaining print solenoids are energized correspondingly, and the
character “2” is finally printed.
Figure 2-5 Print timing chart
1
2
3
5
4
6
7
8
9
Tn
TnH
Tn+2 Tn+1 Tn+3
TnH(4)
Tn+5 Tn+4
Motor, carriage phase
switch timing
Print solenoid