Service manual

EPSON Stylus COLOR 480 Revision B
Troubleshooting Overview 52
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 CN2
Pin 1 and 3
Pin 2 and 4
10.8 Ohms
± 10%
(at 25
°C/ phase)
PF Motor CN3
Pin 1 and 3
Pin 2 and 4
10 Ohms ±10%
(at 25
°C/ phase)
Table 3-2. Sensor Check Point
Sensor Name Check Point Signal Level Switch Mode
HP/PE/IC Sensor CN1/Pin 1 and 2
Less than 0.7V
Off
• Out of HP range
• No paper
• Detect the I/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)