Carriage Drive Mechanism; Table 2-2. Carriage Drive Motor Specifications; Figure 2-6. Carriage Mechanism - Epson Stylus 820 Service Manual

Operating Principles

2.2.3 Carriage Drive Mechanism

The timing belt attached to the base of the carriage unit is driven by the carriage motor, which moves
the carriage unit along the carriage guide shaft left to right, or vice versa. The carriage motor for this
printer is a 4-phase, 48-pole, hybrid-type stepping motor mechanism, allowing the printer to stop the
carriage or change carriage movement in any position. The position of the carriage is recognized by the
home position sensor, and position information is fed back to the carriage drive control circuit. This
carriage motor is driven by motor driver IC A72919 (See Section 2.3.2.3 for more information).

Table 2-2. Carriage Drive Motor Specifications

Item
Motor Type
Drive Voltage
Coil Resistance
Drive Frequency
Excitation Mode
Carriage Guide Shaft
2-6
4-phase / 48-pole hybrid-type stepping motor
+42 VDC ± 5%
22.0 Ω ± 7%
768 ~ 3264 PPS
Constant current bi-polar drive, micro-step drive
Engage Off Lever
Paper Pickup Trigger
Engage On Lever

Figure 2-6. Carriage Mechanism

Stylus Color IIs / Stylus 820
Description
Carriage Motor
Carriage Home
Position Sensor
Rev. A