| Items | SP 8300DN | SP 8400DN | MP 6055/5055/4055 |
|---|---|---|---|
| Paper transport drive | Spur gears | Helical gears: By increasing the efficiency of engagement, the rattling noise is reduced. | |
| Stepping motor | Inner rotor type DC brushless motor: For resource saving and energy saving. | ||
| An electromagnetic clutch is available. | Electromagnetic clutch is not available: To improve reliability. | ||
| Silencing Grease | - | Grease is applied to the gears, shafts, and sliding parts, to reduce the drive noise. | |