Olivetti JP 90 Service Manual

Also see for JP 90: User manual

Olivetti JP 90 Service Manual Manual pdf 17 page image

681640J 1-11JP 90 - Service ManualListed below are some useful tips that will guarantee the optimum use of the print head:- Remove the print head from its sealed container only when you are about to install it in the printer. Theprint head has an 18-month warranty if stored in a sealed container, otherwise the warranty is reducedto about six months (both warranty periods are cumulative).- Never rest the print head on its nozzle or electric contact sides. Never rest the head on heat sources, airconditioners, nor on dirty or dusty surfaces.- If necessary (when the nozzles are clogged), run the nozzle cleaning function (turn to section 7.1).This function forces ink through the nozzles to clear the passages, and will have to be run whenever oneor more nozzles clog.- After a print job, tightly seal the nozzle bay so the nozzles are protected against dust and to avoid the inlkfrom drying-out when exposed for a certain period of time. Since on the JP 90 this operation is carried outautomatically after a few minutes of printer inactivity, wait a few seconds before powering off the machineafter a print job.If a blackout occurs while the printer is on, power off the printer and manually push the print head to itsfarthest right-hand position.Note: If after a print job the personal computer is powered off before the printer, the printer will reset itself.If the printer is powered off during its reset phase, chances are that the print head may come to astop outside of its parking position.It is therefore suggested to power off the printer before the personal computer.1.8 COLOR INK-JET PRINT HEAD OPERATIONColor Ink-Jet Print HeadThe color ink-jet print head is made up of an interchangeable sealed shell containing 51 print nozzles, threeliquid ink cartridges (one for each major color) and an electrical circuitry with 51 resistive heating elements(see Fig. 1-7a).The nozzles are divided among the three major colors as follows:- Yellow: 18 nozzles- Magenta: 17 nozzles- Light blue: 16 nozzlesThe nozzles are constructed in the same way as the ones on the monochrome ink-jet print head. Theyare assembled on a nichel and gold compound referred to as electroformatted, and have a conical shape asshown in figure 1-7b.The ink is contained in three cartridges, one for each color.A sponge inside each cartridge prevents the ink from being shaken during print head movements. Thisavoids problems during carriage translations, avoids the ink from leaking out of the bleedholes and the formingof froth.The ink flows to the nozzles through small channels in the print head's resin layer. This layer is electricallyinsulated from the heating elements.Each heating element corresponds to a nozzle and is connected to the head's external electric contacts.