Overview - Epson STYLUS COLOR 480 Service Manual

EPSON Stylus COLOR 480

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.
Unit level Troubleshooting
Unit repair
Assemble & Adjustment
Figure 3-1. Troubleshooting Flowchart
Troubleshooting
START
END
Table 3-1. Motor, Coil Resistance
Motor
CR Motor
PF Motor
Table 3-2. Sensor Check Point
Sensor Name Check Point
HP/PE/IC Sensor CN1/Pin 1 and 2
Thermistor
TH1 (on the Head
driver board)
(THM)
Overview
Location Check Point
Pin 1 and 3
10.8 Ohms 10%
CN2
(at 25 C/ phase)
Pin 2 and 4
Pin 1 and 3
10 Ohms 10%
CN3
(at 25 C/ phase)
Pin 2 and 4
Signal Level
Off
• Out of HP range
Less than 0.7V
• No paper
• Detect the I/C
On
• Within HP range
More than 2.4V
• Detect the paper
• Not detects the I/C
Analog signal 10 K (at 24 C)
Revision B
Resistance
Switch Mode
52