HP 65 card reader

[NoEqualsButton]

I just scored a HP 65 in immaculate condition. Cosmetically near perfect and works perfectly with the exception of the card reader. I have replaced the batteries and fully charged them. When a card is inserted the motor does not start. No noise. The display just blinks 0.00.

Any ideas? I know the gummy wheel needs replacing anyway, but I'd expect it to at least try and read the cards.