8mm Forum: Need Help! ST-1200 Speed

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Posted by Dan Lail (Member # 18) on September 12, 2006, 04:16 PM:

Need help finding the pot on the ST-1200HD Mag motor board to tweek the speed. It's running a little too fast making the voices a bit high.

Posted by Kevin Faulkner (Member # 6) on September 12, 2006, 05:43 PM:

Dan, the ST1200 range dont have speed control as they use a fixed speed AC motor.

What you need to do is check the belts are in the correct position for 50/60 cycles.

Kev.

Posted by Dan Lail (Member # 18) on September 12, 2006, 06:19 PM:

Thanks, Kev, problem solved. I switched the belts and now the speed is correct. [Smile]

Posted by Kevin Faulkner (Member # 6) on September 12, 2006, 06:52 PM:

Nice one [Smile]

Kev.

Posted by Kurt Gardner (Member # 440) on April 10, 2009, 09:03 PM:

Another topic back from the dead!

My beloved HD has started speeding up now. I checked the belts and they look okay. I bought it refurbished from Irv Higdon in 2003, so I can't imagine they could be shrinking already.

It just happened out of the blue after nearly six years of peerless service. Suggestions, please!

Posted by Lars Pettersson (Member # 762) on April 11, 2009, 01:49 AM:

Even if the ST1200 is fixed speed AC, there must be components related to setting that speed at a certain rpm, perhaps some capacitor in that circuit has dried out?
Or oil on the drive belts?

We really need Kevin on this one.

Cheers
Lars

Posted by Kevin Faulkner (Member # 6) on April 11, 2009, 05:17 AM:

Here I am [Razz]

The ST1200 range use a fixed speed AC Synchronous motor. This means that the speed is fixed to the mains frequency and there fore cant be changed except by changing the size of the drive pulleys etc.

Speed variations on these machines will always be down to worn drive rollers or tight or slipping belts. Check all the rubber components for wear and cleanliness. These rubber belts and drive rollers go soft and eventually sticky with age so make sure that is not now happening.

Kev.

Posted by Kurt Gardner (Member # 440) on April 12, 2009, 10:30 AM:

Sorted! The reel drive belt had slipped position. Thanks again, O Mighty Yoda of Elmos... [Big Grin]

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