Troubleshooting - Epson 440 Service Manual

5.1

Troubleshooting

The printer may exhibit different symptoms for the same problem, which makes troubleshooting more
difficult. This section, however, provides simple and effective ways to facilitate troubleshooting.
The following flowchart illustrates the main steps of the trouble shooting process.
Motor Name
CR Motor
PF(Pump) Motor
Sensor Name
Paper end sensor
Carriage home
position sensor
ASF phase Sensor
Black cartridge
sensor
Color cartridge
sensor
Thermistor
Rev. A
Figure 5-1. Troubleshooting Process Flowchart
Table 5-1.Motor Resistance and Measurement Procedure
Location
CN6(C200 Main)
CN7(C200 Main)
Table 5-2.Sensor Check
Check Point
CN4 / 1-pin, 2-pin
CN5 / 1-pin, 2-pin
CN11 / 1-pin, 2pin
CN8 / 1-pin, 18pin
CN8 / 2-pin, 18-pin
CN8 / 3-pin, 18-pin
Check Point
1-pin & 3-pin,
2-pin & 4-pin
1-pin & 3-pin,
2-pin & 4-pin
Signal Level
Open: less than 0.7 V
Close: more than 2.4 V
Open: less than 0.7 V
Close: more than 2.4V
Open: less than 0.7 V
Close: more than 2.4 V
On: 0 V
Off: more than 2.4 V
On: 0 V
Off: more than 2.4 V
Analog data
Chapter 5 Troubleshooting
Resistance
7.8ƒ¶•}10%
7.8ƒ¶•}10%
Sensor Status
Paper exit
No paper
Home position
Out of home position
Home position
Out of home position
Black cartridge out
Black cartridge exit
Color cartridge out
Color cartridge exit
Change the VH voltage of
charge pulse for common
driver circuit
5-1