Epson Stylus Photo785EPX, Service Manual

Page: 56 / 192

EPSON Stylus PHOTO 895/785EPX/915/825 Revision B
Troubleshooting Overview 56
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 CN13
Pin 1 and 3
Pin 2 and 4
7.8 Ohms
±
10%
(25
°
C/ phase)
PF Motor CN12
Pin 1 and 3
Pin 2 and 4
7.8 Ohms
±
10%
(25
°
C/ phase)
ASF Motor CN11
Pin 1 and 3
Pin 2 and 4
7.8 Ohms
±
10%
(25
°
C/ phase)
Table 3-2. Sensor Check Point
Sensor Name Check Point Signal Level Switch Mode
HP Sensor CN4/Pin 1 and 3
0.7V less than
OFF
• HP Out of range
2.4V more than
ON
• Within HP range
PE Sensor CN5/Pin 1 and 3
0.7V less than
OFF
• No paper
2.4V more than
ON
• Detect paper
Thermistor (THM)
On the Head driver
board
Analog signal 10 K (24
°
C)