EPSON Stylus Pro 9000 Revision B
Operating Principles Summary of Control Circuit Operations 55
2.4.6 Sensors
The output signal sent from each sensor of the EPSON Stylus Pro 9000 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
Thermister is attached to the printhead to monitor the temperature around the
printhead, and it feeds back the detected temperature to the CPU, which in turn
conducts the driver voltage adjustment according to the temperature detected.
Figure 2-24. Sensors
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