INSTRUCTIONS \ SY-1 \ Finishing up

Before mounting the boards in the box it’s a good idea to trim the board.

 

The noise trimmer should be set so that the signal at point 3 is 2.5Vpp. This is according to the original service manual. Though to be honest this will produce quite a low signal in mode F, so crank it up a bit. But no too much! Cause then the output will be even noisier that it already is.

 

When trimming the VCO’s it’s important to ground the two following points.

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(This because the design of the S/H makes the mod bus droop constantly. So if you try to trim it without the S/H being disabled you’ll have the VCO frequency slowly going down, and down, and down…).

 

Make sure the mode switch is set to A before doing the next two.

 

The 1V/Oct on each board should be trimmed to 1V/oct. Input a 0-4V signal in the tune input. Check point 1 with a frequency counter. Adjust so that you have a frequency doubling from 0-1V, from 2-3V, and 3-4V.

 

The trimmer on both board two and three is for the VCO tune. Hook a frequency counter to point 1 and adjust the tune slider for 440Hz. Then measure point 2 and adjust the trimmer for exactly 450Hz. Repeat on next board.

 

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Mount the slider board to the front panel. Do not over tighten any screws!

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Mount board 2 & 3 to the front panel board.

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Slide the bottom half of the case onto the jacks and switches.

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It should gently fall in place, and if it doesn’t just apply some force.

 

The bottom case can benefit from having the four holes screwed and unscrewed a couple of times. They might be a bit heavy due to the powder coating.

 

When assembling the two cases together, it’s best to have the bottom case on a really flat area. And first just thread all four screws. Do not tighten them! And once it’s sure that the case is not wobbling or nothing, take a turn and tighten the screws one by one. Do not over tighten them! Just make sure it’s nice and firm.

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Add a knob of your choice for the mode switches and you’re good to go.

 

That’s it! You’re done with your Syncussion!


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