Service manual

EPSON Stylus Photo 870/1270 Revision B
TROUBLESHOOTING Overview 56
3.1 Overview
This chapter describes how to troubleshoot problems. It consists of the
sections shown in the flowchart below. When identifying and
troubleshooting problems, be sure to proceed to the correct section
specified in the flowchart.
Figure 3-1. Troubleshooting Flowchart
Following sections give detailed information on each step in the
flowchart. Be sure to perform troubleshooting by following the specified
steps without omitting any necessary operations.
Following tables show the checkpoints for each motor and sensor.
Table 3-1. Motor Resistance and Measurement Procedure
Table 3-2. Sensor Check and Measurement Procedure
STARTSTART
Troubleshooting with
LED error indicators
Isolating the defective
parts on the power
supply board
Isolating the problem
with exhibited
phenomenon
Motor
Connector
to check
Check pins Coil resistance
CR Motor CN14 Pins 1 & 2, 31.1
Ω
+/- 25%
PF Motor CN13 Pins 1 & 2, 31.1
Ω
+/- 25%
ASF/Pump Motor CN7
Pins 1& 3 or
Pins 2 & 4
10.4
Ω
+/-10%
Sensor Checkpoints Signal level
Corresponding
condition
PE Sensor CN4, Pins 1 &2
LOW Paper present
HIGH Paper out
ASF Sensor CN6, Pins 1 &2
LOW In the ASF home
position
HIGH Out of the ASF
home position