Epson LQ 300 - Carriage Movement Mechanism

Operating Principles
LQ-300 Service Manual
2.1.2 Carriage Movement Mechanism
The carriage movement mechanism consists of the carnage assembly, CR motor, timing belt, driven
pulley, HP sensor, etc. The CR motor drives the tirnkigbelt. The carnage assembly is connected to
the timing belt, which is moved by the CR motor. Figure 2-2 shows the carriage movement
mechanism.
The printer detects tie carriage home position with the HI? sensor. This sensor is the basis for
determin”mg the carriage home position.
The HP sensor informs the CPU of the carriage home
position. The sensor is ON, when the carriage is pushed to the right or left. The striker on the
carriage actives the sensor to indicate the carriage home position, which toggles the sensor to OFF.
Table 2-1. CR Motor Assembly Specifications
I
Category
I
Requirement
I
Type
4-phase, 96-pole, HB-type stepping motor
Drive
Voltaae
31.5 -38.5 VDC
I Coil Resistance
I 19.6 Q * 8% (Der Dhase, at25° C,770 F) I
Drive Pulse Frequency
Normal Mode Draft 2400 PPS
Color Mode LQ 1600 DDS I
Excitation Method
Constant-voltage 2-2 phase excitation
1-2 phase excitation
Figure 2-2. Carriage Movement Mechanism
F ~~
-1
-.. ,.
2-2 Rev.A