Hi, my memorymoog+ works only with 110V and where I live we have only 220V.
The first (and only) time I powered the mm+ on I didn’t know the 110-220V thing, the keyboard started smoking and of course it still doesn’t work: when I power it on (using a 220-110V transformer) I hear only a “stack” sound…
I’ve got a polymoog model 203A, and somewere on the web I once read that mm+ and Polymoog 203A have the same power supply, so theoretically I could install the working Polymoog 203A’s power supply in the mm+ right ?
Would I be able to fix my mm+ by doing this, if only the psu got fried by the 220V shock ?
Hi,
these two techs are mostly engaged with building new PSUs in extraordinary quality for MMs and Polys. As I know both PSUs are generally the same but not completely. I have been told PSUs should be swapped in any case on both because of heat, wheight and not good working.
I’d not advise you to put that of your Poly in the MM - only for the reason you’ll have far more better quality after.
See below their adresses of their homepage in Germany:
SYNTHTASTE
Höwner
Eppendorfer Straße 22
44869
Telefonnummer:
0160-96456505
eMail:
mghoewner@web.de
There were two different power supplies used in Polymoogs.
The early ones used a power supply made by Faratron. These power supplies have a PC board etch error which contributed to widespread Polymoog malfunctions. They are not recommended for a Memorymoog replacement. I do not know the changeover with serial number.
The later Polymoogs used a power supply designed and made by Moog Music. With the exception of a few components, they are the same power supply in the Memorymoog. However they will not work in a Memorymoog without changing these components.
I don’t understand how you could have made the mistake of powering your MM+ with 220VAC when it is a 117VAC model with an IEC power socket ? You surely didn’t have the original american power cord (with a NEMA 5-15 earthed plug) that came with it then ?
Also, the internal transformer is capable of receiving 220VAC (when the proper fuse PCB is installed, effectively connecting the appropriate primary winding wires for 220VAC operation).
The fact that smoke came out of the synth ins’t good at all. Either the transformer primary has melted, or components on the PSU board are busted. And if you’re really unlucky, higher voltages than required have reached other parts of the synth, damaging components elsewhere too.
Even if the Polymoog PSU could be substituted as replacement (with the modification mentioned by MC above), there’s no guarantee that nothing else was damaged inside your MM+.
Hi, thanks for your answers.
I’ve found that my polymoog has the Faratron power supply, so I can’t use it in the mm+.
I’ve also opened the mm+ to check what’s burned and I’ve found that the only part with burned components are the psu and the fan, the other components look “normal” (they aren’t burned).
This is what the fan and power supply look like:
http://www.ciaocrossclub.it/root/discoremoto/Jackall/007.JPG
(all four purple capacitor look ok on the other side http://www.ciaocrossclub.it/root/discoremoto/Jackall/008.JPG)
http://www.ciaocrossclub.it/root/discoremoto/Jackall/009.JPG
http://www.ciaocrossclub.it/root/discoremoto/Jackall/010.JPG
http://www.ciaocrossclub.it/root/discoremoto/Jackall/011.JPG
I don’t understand how you could have made the mistake of powering your MM+ with 220VAC when it is a 117VAC model with an IEC power socket ?
Haha it was 3 years ago, I was 14 years old, I didn’t know that my mm+ works only with 110V.
You surely didn’t have the original american power cord that came with it then ?
Yes, I didn’t, I used a normal cable (like the one I use with my pc’s psu).
One of these weeks I’ll check on the web for replacements of the burned components, but I don’t know what to do with the fan: should I search a replacement for the original or can I adapt a pc fan ?
Waaaaaaiiiiit a minute !
You mean to tell me that you were 14 years old when you got your MM+ ??
Are your parents millionaires or what ?
When I was 14, some 34 years ago, I could barely get a new 5 speed bicycle for my birthday ! Let alone a $6K synthesizer ! 
Anyway, from the photos, it looks like what smoked is the coil on the fan. Everything else looks okay (but in electronics looks can be deceiving, components can be internally damaged without external signs of it).
The foam underneath some capacitors is normal, and was installed at the factory as a glue.
Ask your rich parents to sent it to a qualified tech for possible salvage at an astromical cost…
Or, better yet, ask them to buy you another one off eBay. That would be a simpler solution. 
You mean to tell me that you were 14 years old when you got your MM+ ??
Are your parents millionaires or what ?
If they were millionaires I wouldn’t even think about fixing the mm+, I would buy another one .
This was my father’s mm+, I found it in my basement (it has been there for more than 15 years).
but in electronics looks can be deceiving, components can be internally damaged without external signs of it
Ok, I will check if there are other broken components and I will see if it’s worth it to replace them.
DO NOT APPLY POWER
Your failure condition could potentially fry irreplaceable CEM ICs and land you a boat anchor, if it hasn’t already.
The MM+ can work on 220VAC but requires modification.
Get this puppy in the hands of an expert, and DO NOT APPLY POWER
Hi.
I found that the fuse was broken, so I replaced it and now the mm+ powers on, but it doesn’t make any sound when I play it.
The front panel works fine, except for the master volume knob and the headphone volume knob: if I move them their values are not shown on the display.
Should those two knob’s values be displayed ?
It sounds like the psu is putting out +5 volts ok and thus you have the digital stuff working.
But with no sound, it’s likely one or both of the 15 volt supplies is bad.
These voltages also power the rare CEM chips, so again it’s recommended not to power it up.
With all due respect, you should really get a pro to work on this instrument or sell it as-is.
The power supply is the heart of an analog synth.
If it dies, everything can die, so it’s really important that it be 100% functional.
As for fans, make sure it’s a standard AC (110 or 220) volt fan.
Do not install a DC fan powered off the power supply.
It will draw too much power and may induce noise into the audio.
Fans are very common and can be found in all shapes, sizes and amounts of airflow vs noise.
Listen to me also !
Throw out that bloody old stuff.
My tech has built in the last few weeks an pretty exclusive one with NO FAN needed and VERY modern.
He burned in all new parts for extrem reliability, presicion and long-life.
These are the most true words when Kevin says, it’s the heart of the synth !!! 
Agreed. Modern switching type PSU will run much cooler (more efficient), be much more stable, take much less space, and weigh much less (especially that monstrous transformer which accounts for a lot of the weight of the MM), AND will work on any line power (100-240 VAC 50-60 Hz).
Have a good tech install a suitable one in your MM, and stop fiddling with old flaky stuff, PSU wise.
Thank you for your answer Kevin 
.
The psu supplies +15.02V and -14.98V, is it okay ?
I checked all the pcbs for unplugged cables but they are all plugged in. Anyway two headers (P49 and P522) are without cable, but since there are no unplugged cables in the memorymoog I think it may be normal…
The memorymoog also loads some bizarre patches and it crashes when I press autotune.
Here is a video that shows the bizarre patches and the autotune error http://www.youtube.com/watch?v=5Rzn26Ee9w4&feature=youtu.be
Next weekend I will check that all the ribbon cables are working and that all the ICs are correctly in their sockets.
Do you have any other suggestions for me ?
Yes, I bought a 115V AC fan, it is the only one I have found.
I know, but sadly I don’t have the money to pay a tech…