Maintenance & Inspection Guide - Johnstech

Pad ROL 100ACONTACTOR CLEANINGThorough Cleaning ProcedureIf the contactor and alignment plate have excessive debris buildup, it is stronglyrecommended to perform a thorough cleaning with an ultrasonic cleaner. Onlyexecute this procedure in a well ventilated area with an exhaust hood.Figure 20: Example of cleaning ahousing in an ultrasonic cleaner;note left position.Figure 21: Example of rinsing ahousing in an ultrasonic cleaner;note right position.CAUTION: The ultrasonic cleaner should have a maximum power of 500W and acatch basket in the tank that prevents the contactor from touching settled debris.Step 1: Prepare the Housing• Remove the contactor from the load board per instructions on Page 13, Step 1.• Gently pry apart the housing and alignment plate per instructions in Step 2 on the opposite page.• Remove ground insert if contactor has one. Refer to ground insert remove instructions on Page22.• If contacts and elastomers require replacement for either the housing or ground Insert, removedthe used contacts and elastomers.• If the contacts and elastomers are in good condition they can be left in the housing during thefollowing cleaning procedures.Step 2: Prepare the Bath• Prepare a bath of diluted Isopropyl Alcohol (70/30 Alcohol/Water) OR a heated (40-50ºC max)mild acidic (7.1 > ph > 3.0) solution.NOTE: If a sonic cleaner is unavailable, gently brush the housing with bathsolution (see above), rinse in deionized water and dry housing out completely.Step 3: Perform the Cleaning (Operate Ultrasonic Cleaner per Manufacturer’sInstructions only).• Fully immerse the populated or unpopulated housing device-side down. The bath should be preheatedand run for a minimum of a 30 minute cycle (see Figure 22).• Also, place the alignment plate and the ground insert into the bath.• Remove housing, alignment plate and ground insert from the bath and sonic rinse and rinse withdeionized water for about 10 minutes (see Figure 23).NOTE: For populated contactor housings or populated ground inserts, inspectfor missing contacts before moving then to the rinse bath. Some contacts maydislodge during the ultrasonic cleaning. Collect them and move them to the rinsebath and then reinstall before drying.16www.johnstech.com©2012 Johnstech International CorporationAll rights reserved.