Epson Stylus Color 640 Service Manual page 83

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