Acer S2W 3300U Service Manual - Page 17

4.2 Transmission Module This module can be divided into two parts. One is the stepping motor that provides enough power and torque to drive the scanning module. The other is the driving mechanism that includes gear train, driving belt and pulley. All of 3 2 5 4 these parts are shown in Fig.4-7 and Tab.4. Fig.4-7 The Transmission Diagram No. Name 1 Stepping Motor 2 Gear10t25t 3 BeltGear 4 Driving Belt 5 Pulley Table 4 (1) Stepping Motor Provides main power to activate scanning mechanism. It can support different speeds (which are controlled by the PCB main board) for any scanning resolution The precision of the stepping motor is 1/600 inch per half step. (2) Driving Mechanism