Epson TM-U950 Technical Manual page 50

CONFIDENTIAL
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Home position sensor assembly
The home position sensor assembly is mounted on the left side of the stroke of the head carriage.
The sensor detects the movement of the sensor plate in the rear section of the head carriage, to
determine the position of the head carriage and any possible malfunction.
The home position sensor assembly consists of an LED and a photo IC. When the head carriage
moves, the sensor plate passes between the LED and the photo IC, therefore blocking the light
from the LED and causing a change in the output level of the photo IC. This change is used to
generate the head carriage position signal.
Rev. A
Figure 2-5. Sensor Assembly
Figure 2-6. Home Position Sensor Circuit Diagram
Mechanism Configuration and Operating Principles 2-5
TM-U950/U950P Technical Manual