Just a small note from my experience: WD-40 is NOT a contact cleaner. Quite the opposite, it will leave a thin layer of lubricate, which can be good for locks and other mechanical parts, where you want to get rid of the unnecessary friction (but please don't use it for your bike's chain). For cleaning encoders, use Kontakt 60:
http://www.kontaktchemie.com/KOC/KOCproductdetail.csp?product=KONTAKT%2060
http://www.kontaktchemie.com/KOC/KOCproductdetail.csp?product=KONTAKT%2060
Fabrizio - thanks for research, photos and Bourns product numbers!
Cheers,2015-05-11 2:51 GMT+02:00 Mike M mikemoyeint@gmail.com [bc2000] <bc2000@yahoogroups.com>:
That's a great result of your investigation... much appreciated.Often the weakest point of failure is the mechanical moving part(s) of a device.- or failed capacitors of an electronic circuit !Michael.