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LX-105O+
Service Manual
Troubleshooting
5.1 OVERVIEW
Troubleshooting most other serial impact dot matrix printers is difficult to perform, since there
may be wide variety of problems.
Therefore, the
LX-105O+
have a sophisticated, built-in
selfdiagnostic function
that reduces troubleshooting time by identifying failed parts or
components.
The following tables and figure provide troubleshooting information.
Table 5-1. Motor Resistance
Motor
Resistance
Remark
CR Motor
11.0
Q
*10
Q
/ Phase
At25“C
PF Motor
40.0
Q
*
7?40
/
Phase
At25‘C
Table 5-2.
Sensor Status
Sensor
Point
Signal Level
Status
H (5V)
Paper exist
PE Sensor
CN6 / Pin 1
L
(GND)
No paper (Paper end)
H
(5V)
Out of home position
HP Sensor
CN7
/ Pin 1
L
(GND)
At home position
H
(5V)
Friction feed
Release Sensor
CN4
/ Pin 1
L
(GND)
Release/Tractor feed
o
#l
Printhead
o
#2
o
#3
o
#4
O
.8
0
#9
( Wire assignment)
Coil Resistance:
19.2
&
1.90 at 25-C
(8etween
each dot wira and common.)
#’1 #’3
j#12
#
1
4 #
1
6
( Terminal assignment)
Figure 5-1.
Printhead
Resistance
Rev.
A
5-1