Epson Stylus COLOR 440 Service Manual page 78

EPSON Stylus COLOR 440, 640, and 740
Sensor Name
Paper end sensor
Carriage home position
sensor
ASF home position sensor
Black cartridge sensor
(BCO)
Color cartridge sensor
(CCO)
Thermistor
Table 3-2. Sensor Check
Location
• Stylus Color 440/640
Open: less than 0.7 V
CN4/Pins 1 & 2
• Stylus Color 740
Closed: more than 2.4 V
CN5/Pins 1 & 2
• Stylus Color 440/640
Open: less than 0.7 V
CN5/Pins 1 & 2
• Stylus Color 740
Closed: more than 2.4 V
CN4/ Pins 1 & 2
• Stylus Color 440/640
Open: less than 0.7 V
CN11/Pins 1 & 2
• Stylus Color 740
Closed: more than 2.4 V
CN6/ Pins 1 & 2
• Stylus Color 440/640
On: 0V
CN8/ Pins 1 & 18
• Stylus Color 740
Off: more than 2.4 V
CN9/Pins 1 & 19
• Stylus Color 440/640
On: 0V
CN8/ Pins 2 & 18
• Stylus Color 740
Off: more than 2.4 V
CN9/Pins 2 & 19
Approx. 10 K
°
Pins 3 & 4 or Pins 3 & 6
at 77
Signal Level Sensor Status
Paper loaded
No paper
Home position
Away from home position
Home position
Away from home position
Black cartridge out
Black cartridge installed
Color cartridge out
Color cartridge installed
Ω
Resistance increases with
°
F (25 C) temperature.
Chapter 3 Troubleshooting
69