Troubleshooting; Component Test Specifications - Epson Stylus COLOR 440 Service Manual

EPSON Stylus COLOR 440, 640, and 740

3.1 Troubleshooting

The printer may exhibit different symptoms for the same problem. Start
with to locate the appropriate flowchart, and then use the
Table 3-4
flowchart to identify a problem based on its symptoms. Refer to the
tables at the end of this chapter for detailed information on testing and
repairing printer components.
The following figure illustrates the main steps of the troubleshooting
process.
Unit-Level Troubleshooting
Power Supply
Repair
Reassembly and Adjustment
Figure 3-1. Troubleshooting Process Flowchart
START
Main Board
Printer Mechanism
Repair
Repair
END

3.1.1 Component Test Specifications

The following tables specify the values at which the CR motor, PF
motor, and sensors should test. In addition, Table 3-3 shows how to
interpret the printer's LED error indicators.
Table 3-1. Motor Coil Resistance
Motor Name Location
CR motor • Stylus Color 440/
640 CN6 (Main
board *)
• Stylus Color 740
CN7 (Main board
*)
PF (pump) • Stylus Color 440/
motor 640 CN7 (Main
board *)
• Stylus Color 740
CN8 (Main board
*)
* Main board refers to the following:
Stylus Color 440: C206 Main-B or C255 Main
Stylus Color 640: C256 Main
Stylus Color 740: C257 Main
Chapter 3 Troubleshooting
Check Point Resistance
±
7.8 Ohms
Pins 1 & 3,
10%
Pins 2 & 4
±
7.8 Ohms
Pins 1 & 3,
10%
Pins 2 & 4
68