motor speed

Hi. My rx-c45 plays too fast, and I can't for the life of me find the motor potentiometer. I have a speed calibration tape, so that's not a problem. Does anyone know where the hole for the speed potentiometer is? Thank you! P.S. I'm talking about the u.s. model, the one with the permanent...

I have a Pioneer sk-21. I am having a problem with the tape speed being way to slow. I adjusted the motor speed about 5 or 6 times and each time there was no change in the speed of tape. All belts appear to be in good shape and present. I bought another motor thinking the motor i had was bad...