Troubleshooting - Epson Stylus Color 400 Service Manual

EPSON Stylus Color 400 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.
Table 5-1. Motor Resistance and Measurement Procedure
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 CN8 / 2-pin, 18-pin
Thermistor
Rev. A
Figure 5-1. Troubleshooting Process Flowchart
Location
CN6(C206 MAIN)
CN7(C206 MAIN)
Table 5-2. Sensor Check
Check Point
CN4 / 1-pin, 2-pin Open: less than 0.7 V
Close: more than 2.4 V
CN5 / 1-pin, 2-pin Open: less than 0.7 V
Close: more than 2.4V
CN11 / 1-pin, 2pin Open: less than 0.7 V
Close: more than 2.4 V
CN8 / 1-pin, 18pin On: 0 V
Off: more than 2.4 V
On: 0 V
Off: more than 2.4 V
CN8 / 3-pin, 18-pin Analog data
Check Point
1-pin & 3-pin,
2-pin & 4-pin
1-pin & 3-pin,
2-pin & 4-pin
Signal Level
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
Resistance
7.8 Ohms 10%
7.8 Ohms•}10%
Sensor Status
5-1