Maintenance & Inspection Guide - Johnstech

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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.
Pad ROL 100APRE-MAINTENANCE TROUBLESHOOTINGThis Pre-Maintenance Troubleshooting section is to help you determine whichpart of your Johnstech contactor may be inspected and/or serviced to address aparticular test problem. This section doesn’t cover test floor, handler, device or anyother variables that may be contributing to your test problem. If you still experienceproblems after following the Maintenance Instructions herein, contact your localJohnstech Representative or complete the form at: www.johnstech.com/support.Experiencing Yield Fall-Off?There are many reasons you may be experiencing yield fall-off but it can frequentlybe attributed to either parametric or continuity failures.Parametric ailures are typically due to increased contact resistance whichcan be caused by:• Dirty Contacts: Inspect contacts per instructions on Page 12.• Worn or Damaged Elastomers: Inspect elastomers per instructions on Page 12.• Device-Pad-to-Contact Alignment: Inspect the contactor registration per instructions on Page11.• Worn or Damaged Alignment Plate: Inspect the alignment plate under contactor Inspectioninstructions on Page 11.• Worn or Damaged Leadbacker/Nest: Inspect the leadbacker and nest.• Oxidation/Contamination of the Load Board: Inspect the load board per instructions on Page11.• Excessive Load Board Pad Wear: Inspect the load board per instructions on Page 11.Continuity failures are typically due to open/short failures which can becaused by:• Excessive Loose Debris: Inspect contactor per instructions on Page 11.• Worn or Damaged Contacts: Inspect contacts per instructions on Page 12.• Worn or Damaged Elastomers: Inspect elastomers per instructions on Page 12.• Worn or Damaged Alignment Plate: Inspect the alignment plate opening under the contactorinspection instructions on Page 11.• Worn or Damaged Leadbacker/Nest: Inspect the leadbacker and nest.• Contamination of the Load Board: Inspect the load board per instructions on Page 11.If experiencing problems inautomated test, first answerthese 2 questions.1) Does the test socket workwhen manually testing with theManual Actuator?2) Do the witness marks fromthe Manual Actuator test lookthe same as those from theautomated test?If the answer to both questionsis YES, then your test problemis probably caused by somevariable other than yourJohnstech Contactor.If the answer to either questionis NO, then read through thechecklists on these 2 pages,under the problem (in red) thatyou are experiencing.If this application has run wellpreviously but is now failing,the troubleshooting mustdetermine what has changed.If this is a new applicationtroubleshooting must examinethe original design.www.johnstech.com©2012 Johnstech International CorporationAll rights reserved.9
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