Epson LQ-850X User Manual - Page 192
Remove any installed printer options such as the pull tractor or, your body.
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Removing the upper case 1. Turn off the power to the printer and the computer. Next, unplug the power cord from the electrical outlet and disconnect the interface cable from the printer. WARNING: High voltages are present inside the printer when the power is on. Do not attempt to remove the cover unless the printer is turned off and the power cord is unplugged. Also, try not to touch contacts on the circuit board of the printer because many of the components can be destroyed by the static electricity that may build up on your body. 2. Remove any installed printer options such as the pull tractor or the cut sheet feeder. Then, remove the paper rest, the printer cover unit, the paper guide, the paper tension unit, and the platen knob. Remove the ribbon cartridge. Slide the print head to the center of the printer. Using the Printer Options 5-43