EPSON Stylus Pro 9500 Revision A
Operating Principles Component List & Illustrations 68
2.1.2.6 Sensors
The output signal sent from each sensor of the EPSON Stylus Pro 9500 is
connected to each IC on the control circuit as shown in the diagram on the
right.
In order to process the detected results as analog signal, the following sensors
input the results into the analog port in the CPU (IC8) via comparator. The
analog signal is then converted to the digital signal by the CPU built-in ADC
(10-bit) and is compared with the standard value for state analysis.
o P_REAR Sensor
o P_FRONT Sensor
o P_EDGE Sensor
Concerning these sensors, since it is necessary that the reference voltage
(threshold) be set at the proper level during AD conversion to match each
sensor’s characteristics, if the main board is replaced, or if the sensor boy is
replaced, it is necessary to adjust the level using the volume (variable resistor)
on the circuit board.
Also, the Thermistor inside the print heads detects the head internal
temperature, feeds it back to the CPU and carries out drive voltage correction
control to match changes in temperature.
Figure 2-26. Sensors
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