Just picked up a Technics SL-QL15 linear tracker. It looks quite good and playback works. I had a Grundig PS 6000 before (rebadged SL-DL5) and it's a nice upgrade.
I mounted my Audio Technica 102EP with the ATN 440MLb needle (thank you VinylEngine!) and the sound is excellent. What worries me though is that the track detection does not work. I read that when the detection fails it is possible that the QL15 will drop the needle at the starting position for 12" records, no matter what record size is actually on the platter. As I also have 7" singles I like to play I am afraid that this might happen to me and that I'd ruin the lovely ATN 440MLb.
This brings me to my question: How do I go about fixing the track detection? Where do I start? As much as I want to fix this deck I really do not want to ruin it by doing something stupid.
I have a soldering station, the service manual for the turntable and a cheap T4P cart for testing purposes. I did some minor repairs on the Grundig before (replaced some switches).
Any Help is much appreciated!