Using Juno 106 Without Voice Chips Installed

In the photo below you can see a shot of my Roland Juno 106 board that I took not too long ago. I took this to illustrate that you can silence the snap, crackle, and pop noise that failing or dying 80017A Chips make. These were desoldered using a Vacuum Pump device and some Desoldering Wire, however, ultimately they were eventually yank out (nicely I must add) and then the holes cleaned up nicely. Once the board was placed back into the Roland Juno 106, there was a nice silence form the removed chip. I could then proceed with playing in either Unison mode or just with the few voices I had left. The Juno 106 sounded awesome. Note that you still get a faint noise from the Chorus effect which is common with all Roland Juno 106′s I believe.

Installed and Removed Juno 106 Voice Chips

Installed and Removed Juno 106 Voice Chips

You will also notice that I still have two of the original Roland 80017A chips in the #3 and #4 slots. They work perfectly and are currently the only two chips that work on the board. The MC-5534A Filter Chip is still working fine in the middle of #3 and #4 Voice chips respectively.

To the right you will also see a brand newly purchased Analogue Renaissance Juno 106 cloned Voice Chip installed, however, this chip is does NOT work. It’s disappointing, however, I am still looking into the matter. The chip is soldered nicely and as you can see next to it on the left is the MC-5534A Filter Chip original still intact and of course the pulled #2 80017A Voice Chip that went bad. I have yet to put in a second chip as of this writing for fear or it not working as well. I’m trying to determine if the new Analogue Renaissance chips are good and why they are not working when appropriately soldered into the board.

In Conclusion, you can most certainly play your Roland Juno 106 Synthesizer with pulled or missing Voice Chips. It will eliminate the Snap, Crackle, Hissing, and any other Noise these failing 80017A chips can create. A trick to playing the Synth without the chips is to hold down the number of voices that play on the keyboard ( in my case 2 ), and then tape down the remaining silent voices to the far right or left of the keys ( in my case 4 dead voices ). You can then release the working voices and play anywhere on the keyboard no problem, but of course the Juno becomes a 2 polyphonic Synthesizer. You can also still play in Unison Mode which works nice too, but it does give you a different tone that some like and dislike. Either way, you can salvage the Roland Juno 106 and play bass lines or make it a mono Synth.

Stay tuned for more updates. Thanks!

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4 thoughts on “Using Juno 106 Without Voice Chips Installed

  1. hey jim handy hints here on using as a monosynth!

    I was wondering if you could help me with mine?!

    I followed the test procedure at analoguerenaissance these are the results:

    ———–1—-2—-3—––4—––5—-6
noise—-ok,w/–ok—ok—–ok—–X—-ok
———tone—————————
square—ok—–X—-ok—–ok—–X—-quiet
saw——ok—–ok—ok—–ok—–X—-ok-
sub——ok—–X—-ok—–ok—–X—-X

    filter—tone—X—-v-–—-v-–—-X—-X
––—-(slow——–quiet–-quiet——
——–sweep)

    X means no sound

    So 3+4 are definitely ok and 5 is definitely broken.

    I assume that fact that sub is broken on 6 and square is quiet that’s probably broken too, and probably 2 as well even though the Saw is ok?

    Is the noise on 1 meant to be different than others? I can clearly hear a tone as well as the noise?

    Also, the filter test indicates that they’re all broken except 1? And there’s a slow filer sweep, what that all about?

    I can’t decipher how many voice chips I need, and whether or not I need the MC5534A WAVE GENERATOR chips as well?

    Any help much appreciated!

  2. Jim,

    I took out all the chips on the voice board. ie. Voice and wave ICs
    Can I power it up? Will it play anything? Or will at worse nothing will happen?
    I ask a seemly dumb question only because I was hoping to go through some of the adjustment procedures, while I’m waiting on my IC sockets to come in.

    • Hello David! You can power up the Juno 106 without issue. It simply won’t play although you could try and put it into unison mode which would only allow you play in mono fashion. I’ve never done that without the chips so likely it won’t work especially since you already pulled the Wave chips as well. Powering up the Juno 106 will be ok though.

      Since this posting I’ve been sending my Juno 106′s to Allen at the Synth Spa located on Ebay. He removed the black resin on all my chips, installed appropriate sockets, and then calibrated everything in the Juno. I believe he also replace some other components around the chips with more heavy duty stuff for a longer lasting board. My Juno’s play beautifully now!

      I hope you can get our Juno 106 back into operation. They really sound great!!

      Regards,

      Jim Atwood

      • Would you happen to know or be able to get socket information? I’m afraid that the chips will not fit the machined IC snappable SIPS I bought.

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