Archived posting to the Leica Users Group, 2002/04/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- --- John Collier <> wrote: > Also: > > Clean the batteries and battery compartment contacts with > an eraser. > > Clean the three gold contacts on the back door and body > with an eraser. ============================================================ First, before anyone can question my qualifications: I have spent more than thirty years in the electronics game. Bench tech, sales, engineering tech, calibration tech, service rep and on. Do not use erasers to clean electrical contacts. Yes, I know they are handy. Yes, they can leave metal bright and shiny - FOR A WHILE! Rubber erasers are formulated with chemicals to try to preserve them from oxidation. Remember the erasers that were hard and crumbly? Those same preservatives tend to be corrosive and to leave a slight corrosive residue. That residue will then defeat the very effort you have made. Typewriter ( ink ) erasers are the worst. Look inside an old typewriter and look at all the rust pits. Use the same care and consideration you would use on a lens. Electrical contact cleaners are not very expensive. I would suggest that and a cotton swab, or folded cloth, even paper towel or tissue. But not the "lotion" stuff. But do not use "tuner cleaner". Some brands of that are also corrosive over the long term. When you consider the very low voltages and small current used in modern electronics, a very small amount of oxidation film equates to a relatively high resistance which can seriously affect accuracy. __________________________________________________ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/ - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html