EPSON Stylus Color 600
Rev. A
2-2
4
2.2.2.2 Sensor Circuits
The following sensor circuits are mounted in t he S t ylus Color 600 and selects appropriate operations
based on the returned information.
ASF Sensor: An ASF sensor detects the position of return lev er when the power i s
(Photo) 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 f or detail.)
PE Sensor: A PE sensor determines if there is paper in the printer. Based on the
(Photo) signal form this sensor, a particular paper edge treatment such as
Micro-weave printing is performed.
HP Sensor: A HP sensor detects the carriage home position.
(Photo) It is used for managing printing position and c l eaning, etc.
Thermistor Sensor: A thermistor sensor keeps stable printing quality, changing PZT dr i ve
voltage(VH) slightly according t o changes of environmental
temperature.
Cartridge Sensors: Cartridge sensors are built i nto the Bk, CMY cartridge on the carriage
unit respectively to determi ne 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 car t ridge is removed.
The figure below shows sensor circuit. Out of the data such as EPW with IEEE 1284 Nibble m ode
to be returned to the host, the data to indicate ink c onsum ption is calculated and managed by the
counter of the firmware. Theref ore, it is omitted here.
CN11
CN4
CN5
1
2
3
HPV
GND
HP
PEV
GND
PE 1
2
3
1
2
3
ASFV
GND
ASF
+5V
+5V
+5V
3
2
1
E05B43(IC2)SW8
SW7
SW6
SW5
SW4
CCO(199)
BCO(201)
PE(203)
HP(205)
ASF(207)
CN8
CCO
BCO
CN8
THM
3
AN0
TMP95C061(IC1)+5V
20
18
Vref
AGND 17
FFi
gure 2-21. Sensor Circuit Block Diagram