Unit Level Troubleshooting - Epson 2070 - LQ B/W Dot-matrix Printer Service Manual

Troubleshooting

5.3 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. Once you identify the problem, refer to the flowchart listed in the
right-hand column of the table below to determine the cause of the problem.
Table 5-5. Symptoms and Problem Descriptions
Symptom
Abnormal CR
Operation
Abnormal Paper
Feed
Abnormal Control
Panel Operation
Abnormal Printing
5-4
Problem Description
• Carriage does not move at all.
• When the printer is powered on, the CR moves
away
from home position after a moment and stops. All
indicator LEDs on the control panel blink.
• Paper does not feed at all.
• When the printer is powered on, paper is ejected
automatically.
• When paper is loaded, it is ejected automatically and
then the printer indicates "Ready."
• Control panel indicator LEDs do not light.
• Operate button does not work.
• Panel buttons do not operate.
• No image is printed.
• Faulty printing — some dots are not printing.
LQ-2070 Service Manual
Flowchart No.
Flowchart 1
Flowchart 2
Flowchart 2-1
Flowchart 3
Flowchart 4
Rev. A