Epson LQ-570e, Service Manual

Page: 58 / 129

EPSON
LQ-570e/LQ-580
Revision
C
Troubleshooting Overview 58
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.
Figure
3-1. Troubleshooting Process Flowchart
3.1.1
Main Component Checking Point
The
following components can be checked by a simple measurement equipment such as a
multimeter.
*:
Set meter to ohms. Then disconnect Motor from Main Board and check it with printer
power
off.
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
START
END
Assembly
and Adjustment
Unit
Repair of the
C293PSB/PSE
Board
Unit
Repair of the
C293MAIN
Board
Unit
Repair of M-5T10
Mechanism
Table
3-1. Motor Coil Resistance Test Points
Motor
Connector
Number
Test
Pin Number
Test
Method*
Meter
Reading
PF
Motor
(CN12)
1
and 3,
2
and 4
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.
16.0
Ω
±10%
(at
25°C per
one
phase)
CR
Motor
(CN13)
Common
pin:5
Test
pins: 1, 2, 3
and
4
Place
one lead on pin5 and the other
lead
on each of the 4 test pins to check
the
two motor phases.
2.7
Ω ±10%
(at
25°C per
one
phase)