New MG-1 - glide issue sorted, thanks.

jetset · Post by **jetset** » Tue Jan 05, 2010 8:11 pm

Hi. I just picked up an MG-1, and need some help sorting out an issue.

I downloaded and followed the manual, and everything seems to be working as it should (and sounds really great) with one exception: the Keyboard Glide slider moves fine, but the effect seems to be stuck on the slowest setting. This only effects the two Tone generators, which each take about five seconds to move from one note to the next. The Polyphonic plays fine and has no glide at all, no matter the setting. I'm wondering if it is as simple as a faulty slider.

Is the Keyboad Glide supposed to effect the Polyphonic channel, or just the Tone Sources? I did join the club of those that have cleaned off the foam goo, (fun!) and have visually inspected the solder joints. Can I test the slider with a multimeter?

Thanks for any and all input.

-John
Baltimore

Voltor07 · Post by **Voltor07** » Wed Jan 06, 2010 3:31 am

Yes the slider can be tested on the Ohms setting. I'm not sure of what the resistance is supposed to be on that slider, though. synthfool.com has a lot of schematics listed...perhaps you could find the info you need there?

samaepstein · Post by **samaepstein** » Wed Jan 06, 2010 9:22 am

glide does not affect poly. only the 2 osc's.

jetset · Post by **jetset** » Wed Jan 06, 2010 9:35 am

Thanks. Now that I think about it, I guess it wouldn't make sense to have the glide affect the polyphony channel.

So that would mean it probably is the slider. Looks like it is a 10k audio taper. Any ideas where I could buy one with the correct pin spacing (instead of the full 15 slider kit?)

Thanks a lot for the help,
-John

Voltor07 · Post by **Voltor07** » Wed Jan 06, 2010 9:54 pm

Again, for parts, try Synthfool.com. Otherwise, you may have to get the whole 15 slider kit...which isn't a bad idea anyway. Somewhere along the line all sliders eventually go bad.

jetset · Post by **jetset** » Thu Jan 07, 2010 12:18 am

The slider is actually a pretty easy fix: I desoldered it, carefully pried open the tabs on the bottom, and disassembled it. There was of course some black foam goo on the pot's wiper. Cleaned it all up, re-assembled, soldered it back in and it works like a charm.

I've fixed a couple of vintage Jazzmaster rhythm circuit switches this way. The tabs get loose after 40 years and the contacts loose or dirty. Nice to keep the original parts.

What a killer little synth. Total cost of ownership: $360 and a couple hours of my labor. Thank y'all for the help.

-John

lizgoode206 · Post by **lizgoode206** » Mon Jan 18, 2010 4:53 am

I just had the same experience!!! I guess when everything should be up and running but still there are glitches here and there... a little cleaning might solve the problem

Moog Music Forum

New MG-1 - glide issue sorted, thanks.

New MG-1 - glide issue sorted, thanks.

Thanks

Fixed!