Service manual

EPSON Stylus Photo R340/350 Revision A
Troubleshooting Overview 8
1.1 Overview
This chapter describes how to troubleshoot problems. Be sure to see the tables
provided in this chapter to identify the component that caused the problem you face.
And follow the instructions in the table to troubleshoot the component. Also refer to
the Motor Wire-Wound Resistor and Sensor Check Points.
Figure 1-1. Troubleshooting Workflow
NOTE:As the CR Motor and the APG Motor are DC motors, the resistance between the pins
fluctuates. So checking them if they work properly or not is made only by observing them
visually (if they rotate or not). It is, however, sometimes difficult to judge, so when in
doubt, replace the motor.
Start
Identifying the unit (component) caused the problem
Repairing the unit (component)
Reassembly and adjustment
Finish
Table 1-1. Motor Wire-Wound Resistor
Motor Connected Pin No. Check Point Resistance
PF Motor
(ASF/Pump Motor)
CN10 Pin 1 and 3
Pin 2 and 4
3.0Ω ±10%
(25°C/phase)
Table 1-2. Sensors Check Point
Sensor Pin No. Check point Signal level Sensor Statuses
Tray Sensor CN2 Pin 1 and 2 --- Open:
Nipped with Star Wheel
(ASF mode)
--- Close:
Star Wheel is released
(CDR mode)
CDR Sensor CN2 Pin 3 and 4 --- Close: CDR Tray not attached
--- Open: CDR Tray attached
PG Sensor CN3 Pin 1 and 2 2.4V or more Close: PG is set to a preset amount
0.4V or lower Open: Switching PG setting
PE Sensor CN4 Pin 1 and 2 2.4V or more Close: No paper loaded
0.4V or lower Open: Paper is loaded