Troubleshooting - Epson Stylus Color 640 Service Manual

EPSON Stylus Color 440/640/740

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.
Unit Level Troubleshooting
Unit Repair
Unit Repair
(Main board)
(PSB/PSE)
Disassemble and Adjustment
Figure 3-1. Troubleshooting Process Flowchart
Chapter 3 Troubleshooting
START
Unit Repair
(Printer Mechanism)
END
Table 3-1. Motor Resistance and Measurem ent Procedure
Motor Name Location
CR Motor • Stylus Color 440/640
CN6 (Main board *)
• Stylus Color 740
CN7 (Main board *)
PF (Pump) Motor • Stylus Color 440/640
CN7 (Main board *)
• Stylus Color 740
CN8 (Main board *)
* 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".
Revision A
Check Point Resistance
Pins 1 & 3, 7.8 Ohms 10%
Pins 2 & 4
Pins 1 & 3, 7.8 Ohms 10%
Pins 2 & 4
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