Service manual

REV.-A
5.2 Repair by Unit
Replacement
Most printer problems can be corrected by replacing the defective unit. First, identifi the problem from the
symptoms you observe using the table below. Then, follow the instructions in the corresponding flowchart
to correct the problem.
Table 5-3. Symptoms and Flowchart References
Symptom
Problem
Flowchart no.
Abnormal operation at
● The carriage does not move.
chart (1)
power on
● The indicator LEDs on the control panel do not light.
Carriage operation abnormal
● Carriage moves away from the home position at
chart (2)
power on.
● The printer does not enter READY mode when the
carriage returns to the home position.
Self test printing abnormal
● The printer does not print the self test.
chart (3)
(Carriage operation is
● The printer does not print some of the dots.
normal. )
Paper feed abnormality
● The printer does not feed the paper.
chart (4)
● The paper feed is irregular.
Control panel operation
● The printer does not feed the paper when you press
chart (5)
abnormal the PAPER FEED button.
Incorrect printing of data sent ● The printer prints data sent from the host computer chart (6)
from the host computer incorrectly, but carriage operation is normal and the
printer performs the self test correctly.
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5-4