Epson LQ-510 - Page 48

PRINCIPLES OF OPERATION
REV.-A
Thermal Sensor (Printhead Temperature Detection)
The thermal sensor in the printhead monitors the printhead temperature. If the head temperature exceeds
a specified upper limit, printing is automatically suspended. Printing resumes when the temperature drops
to a specified lower value. Figure 2-8 illustrates the printer’s thermal-sensor circuit.
Printhead
‘-Thermal
Sensor
Figure 2-7. Thermal Sensor Mechanism (Printhead Temperature Detection)
Thermal
Sensor
in Head
V AREF
R50
3.3K
CN8-16
n
”
b TEMP
10K
T
0.1
CN8-17
r\
”
I
AVss
Figure 2-8. Thermal Sensor Circuit
2-6
LQ-510