Subharmonicon Boot Issue Traced to Audio Output Board — Spare Parts or VCA Workaround?

Hi all,

My Subharmonicon suddenly stopped working from one day to the next. Upon powering up, only LED 1 of Sequencer 1 is blinking erratically, and the unit becomes unresponsive. I tried a firmware update, but it doesn’t recognize any incoming messages.

After opening the unit and doing some troubleshooting with a multimeter, I discovered that the issue is being caused by the audio output board. When I disconnect the output board, the Subharmonicon powers up correctly and responds as expected.

Here are my two questions:

Can Moog provide a replacement audio output board as a spare part for direct purchase?

While waiting for a solution, is it safe to use the VCA output directly into my audio interface to continue using the synth without the output board?

Appreciate any input from users who might have faced a similar issue, and from Moog support if you’re reading this.

Thanks in advance,

Greeeeeeeen


IMG_5777.jpg

The VCA output follows the volume control, so you can dial the volume down to optimum audio interface input levels.

Yes, it should be safe to use the VCA output directly into your audio interface while waiting for a solution. The VCA output provides a clean signal that is typically used for routing the audio to external gear. bạn có thấy điều này hợp lý?

I’m dealing with the exact same issue.

My Subharmonicon was working perfectly one night and the next day it wouldn’t boot properly: weird LED behavior, no sound, completely unresponsive. I also tried a firmware update via SysEx (correct boot mode, correct file order, reliable MIDI interface) and it didn’t react at all.

After reading your post, this really sounds identical to what I’m experiencing.

Did you manage to get a replacement audio output board from Moog, or resolve it another way?
And did you confirm that disconnecting the output board consistently fixes the boot issue?

I’m based in Brazil, so sending the unit to Moog HQ is not straightforward. Any info on how you solved it would be super helpful.

Thanks in advance.