No lens attached (Page 2): Before I retired, I was employed as electronic engineer. I worked on some rather large computer systems, with lots of circuit boards. I cleaned the contact...

Bill Emmett Loc: Bow, New Hampshire

Before I retired, I was employed as electronic engineer. I worked on some rather large computer systems, with lots of circuit boards. I cleaned the contact with a pencil eraser. That is a old trick used by electronic technicians for years. Just rub the eraser lightly over the gold contacts to clean any corrosion, dirt and debris from the contacts. Be sure the eraser is one of those soft type for pencil, not the hard white eraser used for ink.

davidrb Loc: Half way there on the 45th Parallel

Pegaso wrote:

Thank you to all....with the lens cleaner is working ok.

8-) 8-) 8-) What size hammer was used in this fix? :lol: :lol: :lol:

Bloke Loc: Waynesboro, Pennsylvania

dpullum wrote:

Contacts eventually form a thin film of oxide. If ... (show quote)

Back when I was playing with electronics, the techs used to recommend a pencil eraser to clean contacts.

lovitlots Loc: Tottenham, Ontario, Canada

Bloke wrote:

Back when I was playing with electronics, the techs used to recommend a pencil eraser to clean contacts.

You have to be carefull what you use when working in the mirror box. You don't want to be putting dirt onto the mirror or sensor.

photoman022 Loc: Manchester CT USA

I sometimes get that message when using my Tamrons on my Nikons. I take the lens off and reattach it. It works like a charm until the message shows up again.

n3eg Loc: West coast USA

In my early days as a technician back in 1979, I found that eating Fritos corn chips and touching even gold plated contacts would cause intermittent problems due to high resistance connections. It doesn't take much at all on low voltage connections to cause a problem.

Whuff Loc: Marshalltown, Iowa

Bill Emmett wrote:

Before I retired, I was employed as electronic engineer. I worked on some rather large computer systems, with lots of circuit boards. I cleaned the contact with a pencil eraser. That is a old trick used by electronic technicians for years. Just rub the eraser lightly over the gold contacts to clean any corrosion, dirt and debris from the contacts. Be sure the eraser is one of those soft type for pencil, not the hard white eraser used for ink.

My elderly father-in-law has called me to take a look at his ancient garage door opener a couple of times when it was malfunctioning and I employed the same method both times on those contacts. Worked like a charm.

saichiez Loc: Beautiful Central Oregon

I hang out with the Pencil Eraser crowd... simple #2. Do NOT use the white erasers with grit in them, ie. for ink.

Just a simple eraser as on #2

Another thing that accelarates dirty contacts is smoking.... nicotine tars like to break electronics connections with coating the contacts.