Thank you for your advice stustaff, but I thought about that I went this morning to the B&H website where I had bought the reader from 6 months ago. Here is what they say about repairs & warranty :
"Warranties & Repair
All items sold by B&H are warranted solely by the manufacturer/distributor, except "direct import" a/k/a IMP items. All items needing repair (other than IMP) should be sent to the manufacturer/distributor directly for service.
B&H is not liable if the manufacturer/distributor fails to perform warranty service."
Now if you're positive B&H should deal with my problem, I'll try to give them a call/send a mail to their customer service.