I have had a pair of 1210 M3Ds for over 10 years.
This weekend I went to calibrate them for the first time with a multimeter, as the 0 point and +6.6 are slightly off.
Anyway, on the first time of taking off the back cover, the hole for adjusting the 0 point on the back of the pitch fader is missing. There is a black dot (like a permanent marker), but no drilled hole.
The pitch range can easily be changed from the main front board.
I've tried searching all over the internet and cannot find anyone mentioning this. Just posts of people with the same model, who have successfully calibrated the decks.
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