Unit Replacement - Epson LQ-1050 Technical Manual

REV.-A

5.2 UNIT REPLACEMENT

The unit replacement is based on system analysis. According to the particular symptom found by the
multi meter, the units listed in Table 5-3 need to be replaced.
Unit Name
Fuse (Fl)
MONPS BOARD
MONPSE BOARD
Model-53 10
Model-5360
Printhead
Symptom
Printer Does Not Operate
with Power Switch ON
Abnormal Carriage
Operation
Incorrect Printing (in
test) with Normal Car-
riage Operation
Abnormal Paper Feed
Abnormal Operation of
Control Panel
Incorrect Printing in
ON-LINE Mode
Table 5-3. Unit Replacement Numbers
120V 3. 15A UL, CSA
250V Time rug
100/1 20V AC
220/240V AC
Printer Mechanism for
Printer Mechanism for
24-pin dot head
Table 5-4. Symptom and Reference Pages
No indicator on the control panel lights.
Carriage does not move.
Carriage moves away from home position at power ON.
Although the carriage returns to the home position, the
printer does not enter READY mode.
. No printing is executed.
Some dots do not appear.
No paper is fed.
Separation between lines varies with irregular paper
feed.
No paper is fed (by operation of the LF or FF switch)
in OFF-LINE mode.
No operation mode is set from the control panel.
ON-LINE or OFF-LINE mode is not obtained.
Carriage operates normally at power ON and the result
of the self-test is correct. However, the print data from
the computer is not output normally.
.
Description
050
Problem Indicators
5-4
Unit No.
X50206 1060
X502 O63O1O
Y 4 5 4 2 0 2 0 0 0
Y 4 5 4 2 0 3 0 0 0
Y 4 5 4 5 9 0 0 0 0
Y 4 5 5 5 9 0 0 0 0
F416 100000
Reference
Page
5-5
5-6
5-7
5-8
5-9
5-1o