Hey thanks for solving this years old mystery and letting us know !

Hi guys, I am having a hard time figuring out if my unit is in fault or not. Everything seems to work , but I have doubts about the UNIGAIN +4dbm / -20dbm switch operation. When setting to +4dbm the output is louder, compared to the -20dbm setting, but the input signal led indicator is lower. When s...

Concerning the hum issue , sounds like a problem with the filter caps in the power supply.
About the static noise, it should be the infamous output JFETS dying.

Obviously the problem is located in the power supply.
The fact that you are getting 10Volts instead of 5V is bad news, digital components dont like overvoltage.
Good luck, let us know how it goes.

I dont recommend 16V, 25Volt should work ok , 35V is recommended just to be on the safe side.

Hi, I have the inconvenience of battery low (internal). According to what I read, I initially changed the C23 for a new one, and everything remained the same. Then I changed the rest (c11,19,18,21 ... etc) and it keeps telling me the same error. Any idea what the fault may be? I inherited the keybo...

Great news! Enjoy your M1

I have heard that if you reverse the pins of a problematic crystal oscillator , it might start working again.
Since you are waiting for an oscilloscope to arrive, you can try this on the 2nd crystal and see if sth changes.

hi and welcome on the board.
if memory serves me right there are 2 crystals on the d50 mainboard.
Can you measure their frequency?
Relativelly new cheap multimeters can read frequencies up to 50 MHz

Hi Mirzaa,
Since you are getting correct voltages on the +/- 12 voltage rails, the problem should be on the DAC card.
Check R79 in the DAC board (KLM-1261), it should be 10 Ohms.

The minimoog part plays at 1:10, the sound that you are talking about is definitely an overdriven guitar sound through a slow flanger.

Hi flyingsaucer,
these are tantalum caps 10uf at 35 V. I did a quick check on the schematics, but i could not find any 10uf cap to replace.

well that was fast ! great work man

Hi flyingsaucer and thank you for your kind words. Just use a sharp cutter and cut the epoxy glue perimetrically at the base of the caps. You should be able to desolder the caps without problems. there is no reason to remove the remaining epoxy glue from pcb unless the epoxy is in contact with other...

Hi I havent used a neutron but i have some experience in modular synths, so i hope this helps a bit. Gate signal is send from the keyboard to the VCA (or envelope) and that controls the duration of the note that is held. Midi gate is probably active when a midi keyboard is connected to the midi in p...