Specifications

EPSON Stylus Color 440/640/740 Revision A
Chapter 3 Troubleshooting 82
3.1 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.
Figure 3-1. Troubleshooting Process Flowchart
Table 3-1.
Motor Resistance and Measurement Procedure
* Main board refers to the following:
Stylus Color 440: C206Main-B, C255Main
Stylus Color 640: C256Main
Stylus Color 740: C257Main
See the following page for Table 3-2, “Sensor Check” and Table 3-3,
“Printer Condition and Panel Status”.
START
END
Unit Level Troubleshooting
Unit Repair
(PSB/PSE)
Unit Repair
(Main board)
Disassemble and Adjustment
Unit Repair
(Printer Mechanism)
Motor Name Location Check Point Resistance
CR Motor •
Stylus Color 440/640
CN6 (Main board *)
•
Stylus Color 740
CN7 (Main board *)
Pins 1 & 3,
Pins 2 & 4
7.8 Ohms
±
10%
PF (Pump) Motor •
Stylus Color 440/640
CN7 (Main board *)
•
Stylus Color 740
CN8 (Main board *)
Pins 1 & 3,
Pins 2 & 4
7.8 Ohms
±
10%