Hello.
Today we came upon a queer development on a magnetic strip card.
The card was printed vertically and the client required a punch slot at the top end to
insert a hang
chain. The cards were printed and encoded. The (Fargo) encoder also verified that the
encoding
was correctly done.
On running the card thru the reader, the reader sent back an error signal. The card
was encoded
again and read. Again the reader returned an error signal. This was amazing as the
cards were
selected from a box that had not given us any trouble.
A new card was printed and encoded but not punched and read. This read correctly!
The outcome bewildered us. Pushing this further we masked the punched hole with a
black tape and
re-encoded the card. This time it read. The same card with the tape off would not
read!
What could be the cause?
Does the punched slot interfere with the magnetic flux of the mag strip?
Please let me know if you can shed some light on this.
Regards,
Vikram.
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