Epson LQ-850X User Manual - Page 232
setting DIP switch 1-5 to on. See, also select unidirectional printing
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Problem The print position is not what you expected (continued). Vertical printed lines do not align or gaps appear in lines or graphics. Solution The printer is usually set for bidirectional printing. This can cause a slight misalignment of graphics characters. When precise printing of vertical lines is necessary, contact your service center to have them perform the bidirectional print alignment adjustment or select the unidirectional print mode by sending ESC U or ESC < to the printer. You can also select unidirectional printing by setting DIP switch 1-5 to on. See Chapter 3. Unidirectional printing is slightly slower. See Chapter 9. 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. Troubleshooting 7-15