8mm Forum: Need Help! ST-1200 Speed

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Topic: Need Help! ST-1200 Speed

Dan Lail
Film God

Posts: 2110
From: Loganville, Georgia, USA
Registered: Jun 2003

posted 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.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted 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.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Dan Lail
Film God

Posts: 2110
From: Loganville, Georgia, USA
Registered: Jun 2003

posted September 12, 2006 06:19 PM

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

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted September 12, 2006 06:52 PM

Nice one

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Kurt Gardner
Expert Film Handler

Posts: 193
From: San Antonio, TX
Registered: Aug 2005

posted 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!

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Lars Pettersson
Master Film Handler

Posts: 282
From: Stockholm, Sweden
Registered: Jan 2007

posted 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

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted April 11, 2009 05:17 AM

Here I am

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.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Kurt Gardner
Expert Film Handler

Posts: 193
From: San Antonio, TX
Registered: Aug 2005

posted 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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