Sensor Circuits - Epson 440 Service Manual

EPSON Stylus Color 600
2.2.2.2

Sensor Circuits

The following sensor circuits are mounted in the Stylus Color 600 and selects appropriate operations
based on the returned information.

ASF Sensor:
(Photo)

PE Sensor:
(Photo)

HP Sensor:
(Photo)

Thermistor Sensor:

Cartridge Sensors:
The figure below shows sensor circuit. Out of the data such as EPW with IEEE 1284 Nibble mode
to be returned to the host, the data to indicate ink consumption is calculated and managed by the
counter of the firmware. Therefore, it is omitted here.
2-24
An ASF sensor detects the position of return lever when the power is
turned on, and causes the paper to be picked up by the pick up roller
from the normal initial condition. (Refer to section 2.1.1.3 for detail.)
A PE sensor determines if there is paper in the printer. Based on the
signal form this sensor, a particular paper edge treatment such as
Micro-weave printing is performed.
A HP sensor detects the carriage home position.
It is used for managing printing position and cleaning, etc.
A thermistor sensor keeps stable printing quality, changing PZT drive
voltage(VH) slightly according to changes of environmental
temperature.
Cartridge sensors are built into the Bk, CMY cartridge on the carriage
unit respectively to determine if the cartridge is installed or not when it
is exchanged or the power is turned on. In case of Stylus Color 600,
the counter is reset at every time the cartridge is removed.
gure 2-21. Sensor Circuit Block Diagram
FFi
Rev. A