Rock-Ola 484 Turntable not turning

[pipelinewelder20]

I’m working on a Rock-Ola 484 and I seem to be lost. The machine seems to be functioning perfectly but the turntable just won’t spin. There are 3 wires going to the motor 2 black and a green, I know the green is obviously a ground. 1 of the black wires has around 8V on it and the other has around 12V on it, the voltage doesn’t seem to change even when the switch is cycled inside the cabinet. Any help in wha direction to look in would be greatly appreciated.

[Ron Rich]

Hi Welder,
Got the service manual, and the schematics, that should have come with it ? If not, go to our FAQ's section above, and purchase what you need. My guess is that RockOla still used a 117 VAC motor in that model driven by either a switch or a triac ? Are you attempting to read AC, or DC voltage there ? Has the motor been properly oiled in the last 10 or so years?? Ron Rich

[pipelinewelder20]

Hi Ron, thanks for the reply. I have the manual and schematics they are just a little hard for me to follow. I am reading A/C voltage, so what your saying the motor should see 117 VAC when working properly? What I find a little weird is everything else is functioning properly. I’m just looking for a direction to start troubleshooting.

[Ron Rich]

Wielder,
Why--the TT motor is the only thing that runs on 117 VAC--where are you "reading AC", what voltage are you "reading", and which type of a meter are you using ? Ron Rich

[pipelinewelder20]

I’m using a Fluke 789 and I’m reading the voltage at the plug where it connects to the main wiring harness.

[Ron Rich]

Welder,
A digital self scaling meter can not "read" AC voltage-- It will show a false reading if the voltage is there, but no current. Use an incandescent lamp to verify it truly exists. Which "plug connects to (what) main wiring harness" ?