Juno 106 voice issues

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AJ77
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Juno 106 voice issues

Post by AJ77 » Fri Jun 12, 2020 11:27 am

Hi everyone, I am hoping that somebody might be able to help me.

I have a Juno 106 that developed a voice problem a few months ago. All voices would work fine, but after 20 minutes or so, voice 4 would fade out and make pops and weird noises.

I first tried de-soldering all of the voice chips and soaked them in acetone to remove the coating. I did not noticeably damage any traces or components on the board. After the coating came off the chips and I put them back in to the board, only voices 1 and 4 would sound. On test mode, on some settings like square 3 voices would sound, but on the lower sounds only 2 would sound, and different to the ones that sounded on square.

I bought new digital voice chips, and when they finally arrived and I installed them, the same issues were there. I thought it could be the 3 D5534A chips that were faulty, so I bought the new digital versions of them. The same issues persist.

I then replaced the Mitsubishi amplifier chip, but still no change. I have checked resistors and capacitors and nothing that I can see seems to be damaged or faulty.

Is there something on the board that I am missing, or could it be an issue from somewhere else in the Juno?

Any help would be greatly appreciated.

Ashe37
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Re: Juno 106 voice issues

Post by Ashe37 » Fri Jun 12, 2020 3:31 pm

'new digital versions'?

synthchaser
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Re: Juno 106 voice issues

Post by synthchaser » Fri Jun 12, 2020 7:25 pm

Ashe37 wrote:
Fri Jun 12, 2020 3:31 pm
'new digital versions'?
I would assume he means new surface mount clones.

To the OP, I would recommend using an oscilloscope to find what your actual problem is before guessing and changing stuff. You may wind up doing more damage than good.

AJ77
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Re: Juno 106 voice issues

Post by AJ77 » Sat Jun 13, 2020 10:07 am

synthchaser wrote:
Fri Jun 12, 2020 7:25 pm
Ashe37 wrote:
Fri Jun 12, 2020 3:31 pm
'new digital versions'?
I would assume he means new surface mount clones.

To the OP, I would recommend using an oscilloscope to find what your actual problem is before guessing and changing stuff. You may wind up doing more damage than good.
With the COVID-19 issue I couldn't send it off to anyone to look at it, so I assumed it was the common issue with the coating on the voice chips. It's obviously something else, so I am not going to do anything to it until I can get it checked out properly. Thanks for the reply and the advice.

AJ77
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Re: Juno 106 voice issues

Post by AJ77 » Sun Jun 14, 2020 2:41 pm

Ashe37 wrote:
Fri Jun 12, 2020 3:31 pm
'new digital versions'?
Sorry for not being clear in my OP.

I replaced the original chips with these modern clones:

http://www.analoguerenaissance.com/D80017/

Ashe37
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Re: Juno 106 voice issues

Post by Ashe37 » Sun Jun 14, 2020 10:43 pm

They aren't 'new digital versions' any more than the original chips were digital. Hence why i didn't know what you were talking about.

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