Service manual

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EPSON LQ-300+ Revision C
Operating Principles Printer Mechanism 34
2.2.2 Carriage Mechanism
The following is the components of the LQ-300+ carriage mechanism and its
explanation. (Refer to Figure 2-2.)
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Carriage: Mounts the printhead.
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CR motor: Drives carriage to the printing column direction.
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Timing belt: Transfers the drive from the CR motor to the carriage.
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Carriage guide shaft: Shifts the carriage parallel to the platen.
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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 4.5Ω±10% (25°C)
Control method Bi-polar drive
Phase drive 2-2 phase, 1-2 phase, W1-2 phase
Drive voltage 35VDC, +5% -10%
CR feed pitch
Minimum Resolution:
0.212 mm (1/120”) (2-2 phase, 1 pulse)