@laming posted:Got me some bargain AA 2023's. Yes-siree, lil' doozies, they are. They were supposed to "run excellent". Well...
Setting them on the rails and puttin' some joy juice to them results in no joy. Only buzzing, but no movin'. Off to the workbench...
Here's what I've learned so far, as well as what I've tried:
* I can visibly see the E-unit plunger works. It engages the pawl and rotates the drum. (Sometimes the plunger is a bit slow falling back to the bottom.) The headlight works when power is applied.
* All four drum contact fingers are present. I can't feel or see any slop when I lightly press them with a tiny jewelers screwdriver, but that doesn't mean all of them are actually touching the drum contacts.
* Removed the screw holding the motor to the truck and removed the motor. All rotational parts in the truck assembly rotate freely. (Though they will still be cleaned/lubed.) For now, I've set the truck aside.
* Tried running with current clipped to the truck collector and touching the other current lead to the E-unit frame. E-unit cycles, nothing happens at the motor. The motor shaft spins fine when twirled with my fingers.
Question:
If I touch the power leads from the transformer directly to the brush brass, shouldn't the motor spin? In other words, if I touch power where the blue wire and the yellow wire is attached to the brush brass in the photo below, should the motor spin? (It will with a DC motor... but this motor runs on AC.)
Input appreciated!
Andre
Taking a quick look at your photo, I don't see anything attached to the middle terminal, which is one side of the field. It takes three test leads to check that motor.
- from transformer to one brush
- from the other brush to the field (middle terminal)
- from the frame of the motor to the other side of the transformer.
Flipping those two brush connections will reverse the motor.
