Maintenance & Inspection Guide - Johnstech

Pad ROL 100ACLEANING & MAINTENANCE FREQUENCYDetermining FrequencyDue to a wide range of variables (like those listed below), each test floor mustdetermine their optimal cleaning and maintenance intervals through effectiveuse of statistical process control. By carefully monitoring and recording yieldrates and following good test floor troubleshooting procedures, you will be ableto clearly differentiate between interface vs. maintenance problems and aneffective maintenance cleaning cycle can be established to match the needs ofeach test floor. Contact your Johnstech Representative or Field Service for furtherinformation or help.Handler Design and SetupHandlers have a variety of test plane configurations, device transportationmethods, plunge mechanisms and accessories. Each handler has its own uniqueattributes. Handler set-ups that are not optimized can increase the requiredmaintenance frequency by contributing to premature contactor and elastomer wearand oxide build-up on the contacts. By working with Johnstech and your handlersupplier, you can optimize handler/contactor performance to minimize downtime.Correct Contact Compressed HeightIncorrect contact compressed height reduces the effectiveness of the contact’s selfcleaningwipe and may cause increased oxide build-up and/or decreased contact lifeand load board pad life. It may also adversely affect elastomer life by creating tears,cuts or compression set (permanent deformation) shown on Page 12. The contactcompressed height for each contactor is specified on the design data sheet.Package and Device Plating VariationsVariations in packages can affect your maintenance schedule. Different packagevendors, or even different device lots, may have varying amounts of mold flash thatcan decrease wear on the contactor and alter device placement. Also, the methodused for plating the device can vary the rate of debris build-up, and thereforevarying the maintenance interval.ContaminantsAccumulation of contaminants on the contactor and/or load board (such as oxidesand mold flash) will contribute to continuity and/or parametric failures during thetest process.General Test Floor Maintenance ActivitiesThe frequency of handler maintenance procedures also affects contactor cleaning.For example, how often the handler and handler test areas are blown free and/or vacuumed of debris impacts the effectiveness of the contactor. Contactorsexposed to increased levels of foreign debris are likely to require more frequentmaintenance and cleaning.8www.johnstech.com©2012 Johnstech International CorporationAll rights reserved.