Citizen Systems PROdot 350 - Manual (Page 12)

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up until the unit is positioned on the top of printer as shown above.
3. If necessary, centre the print head by hand
4. Hold the ribbon cartridge with the knob facing upwards and turn the
ribbon knob in the direction shown by the arrow to take up any slack in the
ribbon.
5. To install the ribbon cartridge, hold it with both hands, with the
ribbon facing down as shown in the figure.
6. When you look at the print head you will find a small piece of black
plastic on the thin metal sheet of the ribbon guide. Make sure that the
ribbon goes under the piece of plastic.
7. Position the ribbon cartridge with the tabs on its case over the slots
inside the printer case. With the ribbon cartridge and ribbon correctly
positioned, gently push the cartridge towards the back of printer until it
clicks into place.
8. Press the ONLINE and PARK/LOAD keys for 3 seconds so that the
printhead moves several times to the left end of the carriage to ensure the
ribbon slips in to the ribbon guides.
9. Having installed the ribbon, lower the front roller unit and close the
top cover.