Epson 680Pro - LQ B/W Dot-matrix Printer - 3.1 Overview

EPSON Stylus COLOR 680/777/777i Revision B
Troubleshooting
O
verview 50
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.
Figure 3-1. Troubleshooting Flowchart
START
Unit level Troubleshooting
Unit repair
Assemble & Adjustment
END
Table 3-1. Motor, Coil Resistance
Motor Location Check Point Resistance
CR Motor CN12
Pin1and3
Pin2and4
7.8 Ohms
± 10%
(at 25
°C/ phase)
PF Motor CN7
Pin1and3
Pin2and4
7.8 Ohms ±10%
(at 25
°C/ phase)
Table 3-2. Sensor Check Point
Sensor Name Check Point Signal Level Switch Mode
HP/PE Sensor CN4/Pin 1 and 2
Less than 0.7V
Off
• Out of HP range
•Nopaper
•DetecttheI/C
More than 2.4V
On
• Within HP range
• Detect the paper
• Not detects the I/C
Thermistor
(THM)
TH1 (on the Head
driver board)
Analog signal 10 K (at 24
°C)