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need some inputs!!

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It is about a  wind-velocity measurement digital circuit in an exam question.
Here is the link where you can see the circuit:

Its norwegian but you can see the circuit if you scroll down on the page.

Well anyways the question is pretty simple actually:

The 7 segment display is showing 00 even though the wheels on the wind-velocity measurer are rotating.
What are the possible reasons for that??

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