Epson 3800 Service Manual - Page 46

EPSON Stylus Pro 3800/3800C/3850 2.5 Carriage Mechanism The carriage mechanism consists of a carriage movement mechanism, platen gap adjustment mechanism, and carriage lock mechanism. For explanation about the carriage lock mechanism, refer to Cap Unit/Carriage Lock (p.44). 2.5.1 Carriage Movement Mechanism Carriage movement mechanism consists of a carriage unit, CR motor, timing belt, carriage guide shaft, CR scale, and CR encoder. Rotational drive of the CR motor is transmitted to the carriage unit through the timing belt, and the carriage unit moves left and right along the carriage guide shaft. The CR encoder installed on the back of the carriage unit reads the jagged surface of the CR scale and sends the read value to the main board. Position and moving speed of the carriage unit are controlled based on the read value. Revision A CR Scale CR Scale CR Encoder CR Timing Belt CR Motor Carriage Unit Carriage Guide Shaft Figure 2-15. Carriage Movement Mechanism OPERATING PRINCIPLES Carriage Mechanism 46