Service manual

2-4 Mechanism Configuration and Operating Principles Rev. B
Confidential
Printing a character (9x9 font)
A character is printed by energizing the print solenoids with respect to the carriage sub
assembly portion. (The reference timing for the print solenoids is the carriage motor phase
switching signals.) The print head unit moves 0.317 mm (0.012”) (in approximately 1.05 ms) each
time the carriage motor rotates one step (7.5°).
To print the character “2,” print solenoids 2 and 9 are energized first using the same timing as
the carriage motor 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+2Tn+1 Tn+3
TnH(4)
Tn+5Tn+4
Carriage motor phase
switch timing
Print solenoid