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2.1.2 Carriage Movement Mechanism
The carriage movement mechanism consists of the carriage assembly, carriage (CR) motor, timing belt,
driven pulley, home position (HP) sensor, etc. The CR motor drives the timing belt. The carriage 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 the carriage home position with the HP sensor. This sensor is the basis for determining the
carriage position. The HP sensor informs the CPU when the carriage is at the home position. The sensor is
ON, when the carriage is pushed to the right or left. The striker on the carriage activates the sensor to indicate
the carriage is at the home position, which toggles the sensor to OFF.
Table 2-1. CR Motor Assembly Specifications
Category Requirement
Type 4-phase, 200-pole, HB-type pulse motor
Drive Voltage 35 ± 2.1 VDC
Coil Resistance 2.7 Ω±10%, per phase, at 25° C (77° F)
Inductance 3.7 µH ± 20% (per phase, at 1K Hz 1 V rms)
Figure 2-2 Carriage Movement Mechanism
Operating Principles FX-2170 Service Manual
2-2 Rev.A