Olivetti JP 90 Service Manual

Also see for JP 90: User manual

Olivetti JP 90 Service Manual Manual pdf 39 page image

5-3681640J JP 90 - Service Manual5.4 TROUBLESHOOTING GUIDEThis section talks about some of the most significant faults that could be detected, along with their probablecause and corrective action.These faults have been divided as follows:- Problems at Power On:These faults concern the Vac/Vdc power and control circuits.If the printer does not power on (the POWER LED is off and there are no mechanical movements), makesure the line voltage is available. Power the printer off and then on again to check whether this fault persists.When using batteries or a battery pack, make sure these power devices do not have to be replaced/recharged.If the fault has not been cleared, check that the fuse on the power supply board has not blown, then checkthe voltage input to the XP28 CPU board.Replace the XP28 CPU board as last resort.If the printer powers on but does not go through its initialization process (printer initialization is run at eachpower on and resets the printer), make sure the print carriage moves freely and that there is no paperjammed inside the printer. Disconnect the printer from the system.Try powering the printer off and then on again.If the POWER LED begins to flash rapidly, replace the XP28 CPU board.- Inacceptabile Print QualityThese faults do not stop the printer from operating but cause considerable deterioration of the print quality.If the printout is incomplete because one or more dots are missing (the print test shown in section 5.2 canbe used for a comparison), try cleaning the nozzles as explained in section 7.1.If the Nozzle Test shows that one or more nozzles are not receiving the electrical signal, remove the printhead remove the print head and clean the electric contacts on both the carriage and print head using a cleanbrush or a cloth dampened with an alcohol solution.If the fault persists, replace the print head with a new one.If this does not work, try replacing the print carriage and related flat cables. Replace the X28 CPU boardas last resort.If incorrect or smeared characters are printed, make sure the print carriage moves freely.Bear in mind that an excessive increase in the printer's environmental temperature can cause the printedcharacters to smear or the generation of irregular ink droplets.- Incorrect Paper FeedThese faults include paper jams, irregular paper feed or no paper feed at all.Paper movement is controlled by a stepper motor. If the paper is not loaded in the printer, check themechanisms that transfer motion from the motor to the paper feed rollers. If the problem persists checkthe motor cabling. Replace the XP28 CPU board as last resort.