Epson LQ-850 User Manual page 114

Troubleshooting
This chapter discusses problems you may encounter,
likely solution. At the back of the chapter, is a section on the data
dump mode. This mode helps more experienced users determine the
causes of communication problems between the printer
application programs.
Problems and solutions
This section lists possible problems and likely solutions.
The printer does not print
Make sure that the printer is turned on and the POWER light is
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on. If the printer is turned on and the POWER light is not on,
see that the printer is fully plugged in and that the electrical
outlet is also turned on.
See that the ON LINE light is on. If it is not on, press the ON LINE
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button.
Make sure that the printer is connected to the computer. Check
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both ends of the cable between the printer and the computer.
If the printer still does not print, try the self test described in
Chapter 1. If the self test works properly, the printer is all right,
and the problem probably lies in the computer, the software or the
cable. If the self test does not work, contact your Epson dealer.
The printout is faint or uneven
See that the ribbon is properly installed. See the section on
ribbon installation in Chapter 1.
The ribbon may be worn out. See the section on replacing the
ribbon in Chapter 5.
The paper thickness lever may be in the wrong position. See the
section on the paper thickness lever in Chapter 2.
The print head may be worn out. This is especially likely if
parts of printed characters are missing. Contact your dealer to
have the head replaced. Never attempt to replace the head
yourself because other parts of the printer should be checked at
the same time.
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