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Topic: Potts Platter Puzzler: Arm pooped, won't drive Motor!
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Tim Reed
Better Projection Pays
![](/ubbmembers/137h.jpg)
Posts: 5246
From: Northampton, PA
Registered: Sep 1999
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posted 07-11-2007 02:28 PM
Here's one that's got me. Type 3 Alpha 5-deck platter. The very bottom arm (you know, the easiest one to work on!) won't run any motor that's plugged into it. The motors all work fine on the other arms, but no matter which motor you plug into the bottom arm, it won't go.
The arm WILL work (i.e., drive a motor) on makeup, however, but not on rewind or payout. I've already installed a new selector switch, thinking that's about the only thing it could've been, but I was wrong. The AMP pins are in excellent shape and fit snugly to the motor plug, and in the connector itself.
I have continuity from the variac, through the column, through the selector switch, to the motor receptacle... and I EVEN HAVE VARIAC VOLTAGE all the way to the end of the line at the motor connector.
However, the variac voltage disappears when I connect a load (a motor) to the motor receptacle on the arm. The voltage on the other arms is unchanged; it just drops to zero on the bottom arm. I remove the motor plug, and there's my variac voltage back.
I've had the arm off the column and could find no shorts or opens, so I'm stumped as to where to look next. Anyone had a similar problem?
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