Maintenance & Inspection Guide Edge 400A Series - Johnstech

Edge 400a SeriesCleaning & Maintenance Frequencywww.johnstech.com©2009 Johnstech International CorporationAll rights reserved.8Determining Maintenance FrequencyDue to a wide range of variables (like those called out below),each Test Floor needs to determine their own optimal cleaningand maintenance intervals. Careful monitoring/recording ofyield rates and following test floor troubleshooting procedureswill help to differentiate between interface or maintenanceproblems and an effective maintenance cleaning cycle can beestablished for each Test Floor. Contact your Johnstech representativeor Field Service for further information or help.Suggested Cleaning & Maintenance Frequency100K 250K 400K 500K 650K 750KInspect Alignment Towers X XReplace Alignment TowersXInspect Guide Rails X XReplace Guide RailsXInspect Contacts X X X X X XReplace ContactsXInspect Elastomers X X X X X XReplace Elastomers X X XInspect Voltage Key X X XReplace Voltage KeyXInspect Housing X X X X X XCheck & Clean Load Board X X X X X XHandler Design and SetupEach Handler has its own unique attributes: test plane configurations,device transportation methods, plunge mechanismsand accessories. Handler set-ups that are not optimized canincrease your required maintenance frequency by contributingto premature Contactor, Contact, Elastomer and Voltage Keywear. By working with Johnstech and your Handler supplier,you can optimize Handler performance to minimize downtime.PositioningThe Module Y positioning to the Contactor Guide Rail Slot isrequired to be within 0.25mm (0.01 inches) true position andparellelism. The Module X position to the Voltage Key is tobe within +/-0.375mm (0.015 inches) from center of the Key.This positioning allows proper and accurate insertion, minimizingdamage and wear of the Guide Rails, Alignment Towers,Voltage Key, Contacts and Overtravel Stops; and prevents ModuleBoard debris collecting in the Contact area. See Page 16.Module VariationsVariations in Module dimensions, thickness, warpage, vendors,lots, pad compositions, etc... can affect your test results and,consequently, your maintenance schedule. A variation willaffect the amounts of FR-4 debris which causes increased wearon the Contact Assembly and alter Module placement.General Test Floor Maintenance ActivitiesThe frequency of Handler maintenance also affects Contactorcleaning. For example, how often the Handler and Test Areasare blown free of debris impacts the effectiveness of theContactor. Contactors exposed to increased levels of foreigndebris are likely to require more frequent maintenance andcleaning and result in lower First-Pass Yields.