Getting a format error in both on and off positions

I found the problem that causes "FOR" and "CHR" to show and stop the camera working is dirty contacts from the card to the camera, I lightly sprayed electronic contact cleaner on the pins in the camera and the card sockets then plugged the card in and out 10 times, then make sure the card is formatted to "FAT" and all works, at least my has ever since.

I had the same problem with a D70 and found that spraying the pins inside the camera and the sockets on the card with an electronic contact cleaner then working the card in and out several times stopped the problem,it appears the contacts tarnish and do not make a very good contact with the card.

"The pins of card holder get loosen and disconnected by a certain time using CF, and some time your card it self get damaged when you use a defective external card reader which may be a cheaper quality,and remember when you insert a damage card in your working camera, it immediate broke or bends the pins of your camera's card holder. and the Result ""CHA / For""

https://www.facebook.com/pages/Camera-Re..."

"The D70 is an old camera and probably has seen a lot of cards in it’s life…buy electronic switch cleaner and use a cotton bud/small paint brush to clean clean the contacts in the card slot, make sure camera is off while doing this.

NOTE: This electronic cleaner is one of the secret of the repair trade it will repair noisy volume controls, fix flashing torches and a hole host of other things with bad connections"