Quote:
Originally Posted by Ted Kendall
It might be worth checking that the tacho head has not shifted, although this usually affects wow rather than absolute speed.
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The problem did seem to be the tacho head. It had cracked at the base although it looked OK in situ. I tried replacing it with a good one from a mk1 but that didn't work so used some araldite to repair the broken one. It all seems to be working fine now. Thanks for the advice - I would have spent hours trying to find a non-existent fault on the board.