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This topic comprises 3 pages: 1 2 3
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Author
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Topic: Strong Alpha Platter Motor
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Dustin Mitchell
Phenomenal Film Handler
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Posts: 1865
From: Mondovi, WI, USA
Registered: Mar 2000
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posted 11-13-2002 08:41 PM
Josh, Dan Jorgenson, formerly of MTS.Steve, I'm a dummy when it comes to these things. Explain to me how to check the brushes. Brad, yes, I've discovered the wonders of timing my decks. BTW, if anyone is in contact with Ken Layton can you ask him to check this thread out? I remember him posting a part number for a motor from Granger that you can use on the Strong platter, but I can't find it.
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Paul G. Thompson
The Weenie Man
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Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 11-13-2002 10:12 PM
There is a resistor and diode inside the motor shell. I would recommend you check those components before you condemn the motor. The wires have been known to break off now and then. The A-3 had two different style shells on them. One was with a toggle switch (the older ones) and newer one did not. The motor without the switch on the shell had a rotary switch to control the platter functions on the pod. Which one do you have?
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Paul G. Thompson
The Weenie Man
![](http://www.film-tech.com/cgi-bin/paulpics.cgi)
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 11-13-2002 11:11 PM
OK. There are two screws that bolt 1/2 of the shell to the motor frame. Take the cover off, and look around for the doide and resistor. Unplug the motor from the platter, and check the resistor with an ohmmeter. If I recall correctly, it is a 2-ohm 10 watt (maybe 25) wire wound resistor. Check specifically for broken wires. The diode is mounted to a small "L" bracket and that bracket is pop-riveted to the other half of the motor shell. Use the doide checker facility on the meter if it is equipped with it. If not, use a very low ohm scale on the ohmmeter function, and if the diode is good, it'll read a very low resistance in one direction, and a very high resistance (extremely high) in the opposite direction. If the diode is open, it'll show an extremely high resistance in both directions, and that will prevent the motor from running. A shorted diode will show a low resistance in both directions, but it will not prevent the motor from running. It just won't have any torque.
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Paul G. Thompson
The Weenie Man
![](http://www.film-tech.com/cgi-bin/paulpics.cgi)
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 11-14-2002 12:08 AM
Yes on the resistor, it is OK. The diode can be obtained at most any electronic parts house, probably for 3 or 4 bucks, if that. But also be advised that something may have blown the diode. If you hit the motor with 115vac, and if the motor is ok, it'll run (like a bat out of hell, I might add.) If the motor sounds OK, just go buy a new diode and put it in. I would not recommend powering the motor up for test purposes with the platter. If the motor is goofy, it could damage the platter's variac.
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Dustin Mitchell
Phenomenal Film Handler
![](http://www.film-tech.com/ubbmembers/372.jpg)
Posts: 1865
From: Mondovi, WI, USA
Registered: Mar 2000
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posted 11-14-2002 12:23 AM
A few 'dumb' questions:1) Are there different kinds of diodes? I mean, if I walk into Radio Shack and say, "I need a diode" will they know what I'm talking about? 2) How should I go about powering the motor up to test it? Which wires specificaly do I need to connect to a power source and how, and do I need to worry about polarity? Thanks for all your help guys.
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