Epson 680Pro Service Manual - Page 50
Overview, EPSON Stylus COLOR 680/777/777i, Revision B, Troubleshooting, Overview
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EPSON Stylus COLOR 680/777/777i 3.1 Overview This chapter describes how to identify troubles in two levels: unit level repair and component level repair. Refer to the flowchart in this chapter to identify the defective unit and perform component level repair if necessary. This chapter also explains motor coil resistance, sensor specification and error indication. START Unit level Troubleshooting Unit repair Assemble & Adjustment END Figure 3-1. Troubleshooting Flowchart Revision B Motor CR Motor PF Motor Table 3-1. Motor, Coil Resistance Location Check Point Resistance CN12 Pin 1 and 3 Pin 2 and 4 7.8 Ohms ± 10% (at 25 °C/ phase) Pin 1 and 3 CN7 Pin 2 and 4 7.8 Ohms ±10% (at 25 °C/ phase) Sensor Name HP/PE Sensor Thermistor (THM) Table 3-2. Sensor Check Point Check Point Signal Level Switch Mode CN4/Pin 1 and 2 Less than 0.7V More than 2.4V Off • Out of HP range • No paper • Detect the I/C On • Within HP range • Detect the paper • Not detects the I/C TH1 (on the Head driver board) Analog signal 10 K (at 24 °C) Troubleshooting Overview 50