Advanced Printing Systems
SS205-V4+ LV - Technical Manual - Rev B Page 13
4. STEPPER MOTOR DRIVING METHODS
The paper feed pitch for stepper motor is 2 steps for one dot-line (0.125 mm). For good print quality it is
advised to keep the current into the windings between two successive dot-lines.
It is also recommended to have a few dot lines not printed at motor start to avoid print compression effect
due to play take-up into gear box.
The timing diagram is then as follows:
There are four different positions for the stepper motor. The driving is bipolar and can be achieved
with circuits like: the Rohm BA6845FS, the Sanyo LB1846, LB1848, or LB11948T which offer a
PWM current control. Please refer to the IC’s data sheet for further information. It is recommended
not to exceed 0.2V like voltage drop in the stepper motor driver circuit.
Coil resistance: 11Ω±10%
For good print quality, it is advised to keep the current into the windings between two successive
dot-lines.
It is also recommended to have a few dot lines not printed at motor start to avoid print compression effect
due to play take-up into gear box.
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