Problem with Moog Satellite

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Problem with Moog Satellite

Postby black_spiral » Tue Jan 06, 2009 4:58 pm

I recently purchased a Moog Satellite. When it is plugged in, there is only one voice. It doesn't matter what switches you flip down. There is also no difference in sound for any of the keys, they all make the same sound. Any ideas on how to fix this? I'm not familiar with synths or circuit boards and am not sure what to look for. Also, the power cord has been replaced by a monstrously long cable that looks like it came from an old vacuum. I wouldn't mind replacing it with something more along the line of factory. Any advice is appreciated. Thanks.
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Re: Problem with Moog Satellite

Postby Maschinengeist » Wed Jan 07, 2009 5:22 am

I'm currently rushing in the repairshop but as soon as I've got a minute I will dive in my schematics and try to come back to you asap.
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Re: Problem with Moog Satellite

Postby black_spiral » Wed Jan 07, 2009 9:08 am

Awesome. Thank you.
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Re: Problem with Moog Satellite

Postby rhino » Thu Jan 08, 2009 4:37 pm

probably, like many early monos, there are two switch contacts on each key: one is a trigger, the other provides the pitch information . the pitch contacts usualy have a string of resistors that divide the voltage to make a scale. if a wire has come loose from one end or the other of the keyboard, each key would get about the same voltage and therefor play (close to) the same pitch.
at the same time, it was common to have the preset tabs/buttons feed voltage to a diode matrix to select the correct functions/modulations. these switches were usualy in series...that is, only one can be 'on' at a time. if the wire feeding voltage to them were off, you could loose the signal to change 'tone'.... so all presets AFTER that bad point would not work.
"A thing may seem impossible...until it's done."
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Re: Problem with Moog Satellite

Postby Maschinengeist » Sat Jan 10, 2009 5:36 am

Could be either the S&H circuit or the Glide Circuit or even the isolation amplifier. While at it, the Keyboard Bias Supply should be checked.

In those circuits (surrounding the keyboard), what could be wrong can be either resistors, capacitors, op-amps and transistors. I suspect it's a combination of at least a few of them and not a single thing. My money would go on the Sample & Hold circuit (not related to any knob btw.... the name may be confusing)

Either ways, it's not a problem perceptible to the naked eyes. You need test equipments and electronics knowledge. I do NOT encourage you to venture there is you don't know what you're doing nor know what to look for. You may injure yourself, damage the instrument and ruin your equipment (like a multimeter). Please see a technician and have it inspected. It's pricey but you (usually) buy peace of mind and avoid a lot of problems.

Hope that helps
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Music electronics repair & More
Help? See TechZone
Parts? email!
Service Manuals?+/-2000 documents!
Sorry, they aren't free
Now on FACEBOOK: "Muzik Elektronix"
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and more stuff
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Re: Problem with Moog Satellite

Postby black_spiral » Tue Jan 20, 2009 3:03 am

Thanks for the input. I'll see what I can do about having it looked at.
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