Overview; Main Component Checking Point - Epson LQ-570e Service Manual

EPSON LQ-570e/LQ-580

3.1 Overview

The printer may exhibit different symptoms for the same problem, which makes
troubleshooting more difficult. This section, however, provides simple and effective ways
to facilitate troubleshooting. The following flowchart illustrates the main steps of the
troubleshooting process.
Note: This information is necessary only for the servicers who repair to component
level. Servicers who repair to unit level can ignore this section.
W A R N I N G
Measuring the DC voltage or checking some signal waveforms
requires switching on the printer without housing covers and shield
plate. Therefore, do take care of safety operation and not damage
other unrelated componets.
Unit Level Troubleshooting
Unit Repair of the
Unit Repair of the
C293PSB/PSE Board
C293MAIN Board
Assembly and Adjustment
Figure 3-1. Troubleshooting Process Flowchart
Troubleshooting
START
Unit Repair of M-5T10
Mechanism
END

3.1.1 Main Component Checking Point

The following components can be checked by a simple measurement equipment such as a
multimeter.
Table 3-1. Motor Coil Resistance Test Points
Motor
Connector Test Pin Number
Number
PF Motor 1 and 3,
(CN12) 2 and 4
Common pin:5
CR Motor
Test pins: 1, 2, 3
(CN13)
and 4
*: Set meter to ohms. Then disconnect Motor from Main Board and check it with printer
power off.
Overview
Test Method*
Place one lead on pin1 (pin2) and the
other lead on pin3(pin4) on each of the
test pins to check the two motor phases.
Place one lead on pin5 and the other
lead on each of the 4 test pins to check
the two motor phases.
Revision C
Meter
Reading
16.0Ω ±10%
(at 25°C per
one phase)
2.7Ω ±10%
(at 25°C per
one phase)
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