Specifications

REV.-B
5.2 REPAIR BY UNIT REPLACEMENT
For most problems, it is sufficient for you to determine the difficulty to the unit level. Refer to Table
5-3, identify what the problem is, then perform the checks according to the corresponding flowchart.
Symptom
Table 5-3. Symptoms and Reference Pages
Problem
See Page
Printer fails to operate when
power is on.
Carriage operation is abnor-
mal.
Printing is faulty during self-
test, but carriage operation is
normal.
Paper feeding is abnormal.
Control panel operation is
abnormal.
Printing of data sent by the
host computer is faulty.
. Carriage does not move.
. Control panel indicator lamp does not light.
5-3
. Carriage moves away from home position at power
on.
5-4
. The carriage returns to the home position correctly,
but the printer then fails to enter the READY mode.
. No printing at all.
. Faulty printing -some of the dots are not printed.
5-5
. No paper is fed.
. Regular paper feed, but with variations in the separa-
tions between lines.
5-9
. When the LF switch is activated, no paper is fed.
5-12
. Carriage operates normally at power on, and self-test
is executed correctly.
5-13
. Print data from the computer, however, is not printed
correctly.
The repair procedure flowcharts are represented using the following symbols:
(Yz-)
Start
o--
Branching
Processing
77
Returning to the Start of the item
Forwarding to another
item
End
Decision
5-2