3.2 UNIT LEVEL TROUBLESHOOTING
You may be able to identify the defective unit just from the symptom displayed. The table below
provides the symptoms for a number of failures, so that you can easily identify the problem. Once
the problem has been identified, refer to the flowchart listed in the right-hand column of the table
below to determine the case of the problem.
Table 3-6. Symptoms and Problems
Symptom Problem See Page
Printer fails to operate
when power is on.
• Carriage dose not move.
• Control panel indicator LEDs do not light.
3-5
Abnormal carriage
operation at power on.
• Carriage moves away from the home position at
power on.
• Carriage returns to home position correctly, but the
printer then fails to enter the READY mode.
3-6
Printing is faulty during
self-test, but carriage
operation is normal.
• No printing at all.
• Faulty printing some dots are not printing.
3-7
Abnormal paper
feeding
The printer prints but feeds paper incorrectly. 3-8
Abnormal control panel
operation
When the LF/FF switch is pressed, no paper is fed. 3-9
Data sent by the host
computer is printed
incorrectly
• Carriage operates normally at power on, and self-test
is executed correctly, but data is not printed.
• Data from the computer is printed incorrectly.
3-10
The repair procedure flowcharts use the following symbols:
START
END
Start
Preocessing
Forwarding to
another items
Decision
Return to the
Start of the item
END
Branching
Figure 3-3. Symbols Used in the Flowcharts
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