So my TT has the cutout in the mat that allows for two "fingers" to detect if there is no record, a 7-inch record, or a 12-inch record present. My issue is that when I first turn on the TT after letting it sit overnight, when I hit the Start button it automatically moves the tonearm to what I suspect would be the starting point for a 7-inch record. Then I raise the arm, move it to the 12-inch starting point, and all subsequent records after that point while it's powered on work fine.
Looking at the little fingers, the one closer to the center for 7-inch detection seems to be good. I can manually press it in and it pops back out on its own. The 12-inch finger farther out though seems to be stuck down all the time.
If I take the platter off, I can move the lever under these fingers and then the 12-inch finger will pop up. But, if I let go of the lever everything moves back to how it was with the 12-inch detection stuck down.
This is weird, because I would think if the 12-inch is always down and a record places on the platter then lowers the 7-inch that all would be well. This is also very weird that it only happens the first record I play after turning it on.
Now if I turn it off quick and turn it back on, it will not reproduce. It needs to sit powered off for a bit before it does it again.
What am I missing here?
EDIT: And there's some pics of what the top side of these 'fingers' look like at the bottom of this thread: viewtopic.php?f=16&t=101140&p=910269&hilit=detection#p910269