Originally Posted by dave_mezza2006
Thanks but couldn't get the link to work.
Anyway I've got the unit out (thanks for the help) and discovered the problem.
The problem wasn't with the reader but the card.
I've had the cards open to fix them and used tape rather than glue to keep the two halves together.
On the picture the card goes in the dirction of the arrow. The front edge of the card (by the hole) pushes against the plastic pin (1) and rotates pin (2) down through the hole in the card.
What happened with my card was that it started to separate when pushed in meaning it did not rotate the pin (2) until the card was inserted too far. The pin then comes down on the top of the card rather than into the hole.
The fix to the card was simply to put some tape along the leading edge.
I guess that if I had left this eventually the lock mechanism would have fractured.
(3) in the picture is the locking solenoid.
Interestingly if the locking pin gets left in the locked position with the card out then it would not be possible to insert the card.