Printer/MFP in stand alone condition remove the JetDirect Card if equipped, the hard drive if equipped, fax card if equipped and any HP paper handling accessories. In addition, if applicable all third-party DIMMs (leave the minimum HP memory installed) and all third party solution components and/or accessories should be removed Install one by one check which device having faulty, replace it..After replacing the part check firm ware loaded in the printer if its lower version than present one up load latest firm ware..
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