Unit Level Troubleshooting - Epson DLQ-3000 Service Manual

5.2 UNIT LEVEL TROUBLESHOOTING

For troubleshooting, make repairs by unit replacement and adjustment based on the problem
symptoms. Follow the corresponding flow chart after finding the problem in Table 5-3.
Table 5-3. Problems (Requiring Unit Replacement)
Problems
The printer does not operate after the
power is turned on.
The printer goes to an error state after
the power is turned on.
Improper printing (during self test)
Abnormal paper feed
The control panel does not function
correctly.
Improper operation during ON-LINE
mode
Description
No LEDs and LCDS on the control
panel light.
. The mechanism does not initialize.
. One or more LEDs light or blink,
to Table 5-2).
. The mechanism initial izes,but goes
to an error state.
. The mechanism does not print.
One or more dots are missing.
Bad print quality
Incorrect color switching (during
color printing)
The paper cannot be fed.
. The paper feed length varies.
Paper jams often.
. The printer does not respond
normally to the switches.
. Abnormal control panel indication
. The Select Type is not reflected
correctly.
. Panel switch setting doesn't work.
. Although the self test printing is
normal, the printer cannot print data
from the host computer correctly.
. The printer cannot print.
. When the printer is operating, an
error occurs on the host computer
side.
Troubleshooting
Reference
Page
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5-3