need some inputs!!

[adi82]

It is about a  wind-velocity measurement digital circuit in an exam question.
Here is the link where you can see the circuit:
http://www.diskusjon.no/index.php?showtopic=752114&hl=+temperaturm%E5ler

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??

[ante]

There could be a number of reasons for this! Have you got any pulses (on a scope) from U8:A clock? Also on pin 6 of U3:B input (from IC1)?