I purchased a Dentron RT-3000 tuner sight unseen (hopefully not my undoing!). The inductor roller turn knob on the front panel of the tuner connects to a metal rod that is then affixed to an identical rod in the center of the inductor coil mechanism (sorry if I don't have all the terms right) by means of a metal sleeve/collar with 2 screws in it. Turning the knob on the front turns the entire shaft and moves the coil - for about 1/4" before the collar slips and the coil no longer turns. You cannot tighten the screws down on the collar any before the heads start to strip.
Attached is picture of inside of tuner. The collar with the 2 screws that is slipping is near the center of the picture. Any ideas how to make this collar work so that turning the knob on the front panel actually turns the shaft on the coil (so the coil will turn)?
Can you remove the screws ?
If so , also can you manually turn the inductor , to make sure it is not seized , the bearings on either end need lube on occasion ?
If all of the above works , then check to see if screws do not bottom out on collar between the 2 shafts , if they do , the pressure is on the collar , should be on shafts , use longer screws .
For prevention , you may want to remove , so that you can file flats on both shafts where screws do there work .
Yes, the screws will come right out. The inductor turns manually as well. I'll look for longer screws, possibly even setscrews? I'm not sure how easy the inductor shaft comes out. Thanks
If you have dermal tool , you could slide the coupler over & make flat , but I would cover all the rest of tuner to avoid getting any metal dust on anything .
As it turns out it's not the collar. Well at least it's not JUST the collar. I unscrewed it and slid it back so that I could spin the coil by hand. It actually spins independently of the shaft going through the center of it turning at the same time, or the shaft will turn a little bit with it but not very much. This is much more of a pain to fix because most of what I can see with the coil is soldered in place.
Dentron RT-3000 inductor shaft collar slipping
