Service manual

EPSON LX-300+ Revision A
Operating Principles Printer Mechanism (M-3M10) 45
2.2.2 Carriage Mechanism
The following is the components of the LX-300+ carriage mechanism and its
explanation. (Refer to Figure 2-2, "Printer Mechanism Block Diagram")

Carriage: Mounts the printhead.

CR motor: Drives carriage to the printing column direction.
 Timing belt: Transfers the drive from the CR motor to the carriage.
 Carriage guide shaft: Shifts the carriage parallel to the platen.
 HP detector: Detects carriage home position.
CR MOTOR
This printer uses stepping motor for CR motor. Open loop control switches
the phases according to the setting period and this mechanism enables the
carriage to move until the appointed position. The table below is the CR
motor specifications.
Table 2-3. CR Motor Specifications
Item Specification
Motor type 2-phase/200-pole hybrid stepping motor
Coil resistance 5.7
Ω
±10% (25°C)
Control method Bi-polar drive
Phase drive 2-2 phase, 1-2 phase, W1-2 phase
Drive voltage 36.75 ±1.75 V
CR feed pitch
Minimum Resolution:
0.212 mm (1/120”) (1-2 phase, 2 pass)