boxtec Forum
Projects => Geiger/Radmon Kit => : boxtec-support March 22, 2012, 01:08:38 AM
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Some PCB boards shipped in shield kits between 14/12/11 and 20/3/12 have an area of the ground plane that is not connected to ground. This causes a “CARD !” message at startup and the card cannot be written to.
(http://forum.boxtec.ch/index.php?action=dlattach;topic=67.0;attach=30;image)
The little piece of backplane on the left side of IC2 is an island, and it is not connected to ground. Therefore, pin 4 of the chip is not receiving a ground.
(http://forum.boxtec.ch/index.php?action=dlattach;topic=67.0;attach=30;image)
To fix the problem, bridge the two backplanes with a little piece of wire soldered between them. You will need to scrape off the red surface finish before soldering. (right pic shows a quick and dirty fix)