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Strange behavior OB6 Module

Strange behavior OB6 Module
« on: April 01, 2017, 12:34:25 AM »
I've had my OB6 Module (serial 566) for about a week now, and it has developed a strange behavior. After it has been powered on for a while, about an hour, it will suddenly go completely silent. Power cycling will bring the sound back but only for a very short time, and it will go completely silent again. After 2 or 3 power cycling off and on, it will eventually be ok again, and remain that way for hours after that.

This has happened 2 times in all. And the first time it did that, I tried a calibration (thinking it might be VCA calibration related) and the procedure got stuck at F11. I had to power down the unit. Tried it a second time and it got stuck again on F11. Again, only solution was to power cycle to reset. The third time it calibrated itself correctly and the sound was back.



It was perfectly okay after that for several days. Until today, when it did the exact same thing all over again.
I've eliminated any MIDI issues by disconnecting everything but the power cord, and have the module play by itself with the onboard sequencer.

Do I have an intermittently defective unit do you think ? Anyone else getting stuck on F11 calibration, and what does that mean ? Defective voice card #1 possibly ? Or a bug in the calibration procedure ?
Anyway, if this happens a third time, I'm going to write an email to DSI about it.

EDIT: I'm running OS 1.2.0
« Last Edit: April 01, 2017, 12:36:51 AM by AlainHubert »
Minimoog D (vintage), OB6 (Desktop), Oberheim Matrix-6 (MIDI Controller), Prophet REV2-16, DeepMind 12

Re: Strange behavior OB6 Module
« Reply #1 on: April 01, 2017, 06:14:57 PM »
Quick update. It happened again today, after several hours playing it, and switching very rapidly between patches (sliding my finger across number from 0 to 9) brought the sound back. I didn't have to power cycle the OB6 to get the sound back this time.

Also when the module goes silent, it's as if the master volume knob was rapidly turned down (the sound doesn't cut off abruptly).
Sometimes when it's silent, switching to another single patch will very briefly be able to play a note, only to hear it quickly disappear again. Very strange.
Minimoog D (vintage), OB6 (Desktop), Oberheim Matrix-6 (MIDI Controller), Prophet REV2-16, DeepMind 12

Re: Strange behavior OB6 Module
« Reply #2 on: April 02, 2017, 02:26:18 PM »
Replying to myself again.
I've re-installed the firmware upgrade 1.2.0, since the first time I did it (I had received my OB6 Module with 1.1.4 installed), it didn't complete on its own and got stuck (the module didn't reboot itself, and I had to shut it down after a couple of minutes).

Since doing that this morning, the synth hasn't had any problem, having been powered on for 8 hours straight and working with it all day so far. Woohoo !
So it seems that my problem has disappeared by re-installing the firmware (which this time got completed on its own, by rebooting itself in the end, as it should have the first time).
Minimoog D (vintage), OB6 (Desktop), Oberheim Matrix-6 (MIDI Controller), Prophet REV2-16, DeepMind 12

Re: Strange behavior OB6 Module
« Reply #3 on: April 08, 2017, 10:36:14 AM »
Final thoughts on this thread. Problem solved by re-installing firmware.
The issue never happened again since then. Must have been a case of firmware update not having been completed properly the first time.
Minimoog D (vintage), OB6 (Desktop), Oberheim Matrix-6 (MIDI Controller), Prophet REV2-16, DeepMind 12

Jdoo

Re: Strange behavior OB6 Module
« Reply #4 on: April 08, 2017, 11:54:37 AM »
Final thoughts on this thread. Problem solved by re-installing firmware.
The issue never happened again since then. Must have been a case of firmware update not having been completed properly the first time.

Thanks for following up.  It hasnt happened to me - but it's great seeing follow-up / closure on stuff.

Re: Strange behavior OB6 Module
« Reply #5 on: August 27, 2019, 05:33:28 AM »
Has anyone has this issue with update 1.5.5? I'm having the issue of getting stuck at f11 to. Same sound issue also.