Epson 440 - Manual (Page 83)

EPSON Stylus Color 440/640/740 Revision A
Chapter 3 Troubleshooting 83
Table 3-2. Sensor Check
Sensor Name Location Signal Level Sensor Status
Paper End Senior
• Stylus Color 440/640
CN4/Pins 1 & 2
Open: less than 0.7 V Paper loaded
• Stylus Color 740
CN5/Pins 1 & 2
Close: more than 2.4 V No paper
Carriage Home Position
Sensor
• Stylus Color 440/640
CN5/Pins 1 & 2
Open: less than 0.7 V Home position
• Stylus Color 740
CN4/ Pins 1 & 2
Close: more than 2.4 V Out of home position
ASF Phase Sensor
• Stylus Color 440/640
CN11/Pins 1 & 2
Open: less than 0.7 V Home position
• Stylus Color 740
CN6/ Pins 1 & 2
Close: more than 2.4 V Out of home position
Black Cartridge Sensor
• Stylus Color 440/640
CN8/ Pins 1 & 18
On: 0V Black cartridge out
• Stylus Color 740
CN9/Pins 1 & 19
Off: more than 2.4 V Black cartridge installed
Color Cartridge Sensor
• Stylus Color 440/640
CN8/ Pins 2 & 18
On: 0V Color cartridge out
• Stylus Color 740
CN9/Pins 2 & 19
Off: more than 2.4 V Color cartridge installed
Thermistor
• Stylus Color 440/640
CN8/ Pins 3 & 18
Analog data
Change the VH voltage of charge
pulse for common driver circuit
• Stylus Color 740
CN9/ Pins 2 & 19