- This topic has 15 replies, 1 voice, and was last updated 4 years, 6 months ago by Anonymous.
28.08.2016 at 13:12 #9278Anonymous
I just finished installing the Juno-66 into my 60. It all went smoothly but now I’m not getting any waveforms. Noise, filter, chorus and Env work fine. I also installed the filter and pitch control mods.
Any idea what it could be?
Thanks!29.08.2016 at 07:17 #9279
Is the filter tracking working?
If so: sounds like the DCO dividers are not running.
Can you measure a rectangular waveform at pin 10,13,17 of IC 55?
Check all the Pins on the Juno-66 for continuity and shorts .
Especially Pins 10 – 23 and 35, 36, 38
You can also post a photo of the installed Juno-66, sometimes this helps..29.08.2016 at 10:34 #9280Anonymous
Thanks for the reply!
Yes the filter tracking is working. No shorts on the cpu pins on top. I’ll check continuity next.29.08.2016 at 10:48 #9281Anonymous
Going to grab a scope but for now I can measure 3.9 VDC on pins 10, 13 and17 of IC 55
Thanks29.08.2016 at 12:01 #9282Anonymous
Ok I checked continuity on all those points and everything is fine. No shorts on the socket either. I can see no waveform with a scope on pins 10, 13 and 17 on IC 55.
Here’s a pic. What should I try next?
29.08.2016 at 17:13 #9283Anonymous
So I’ve doubled checked everything. I have continuity all all pins including the ones not mentioned as critical and it all seems ok.
Sadly it’s still not working 🙁
I have no waveform on the pins of IC55 and no sub, saw or pulse waves. Noise still works and filter os tracking.
I’m really not sure what else to do at this point.
Any help is greatly appreciated.
Thanks30.08.2016 at 04:46 #9284
If you can: Put in the original CPU, see if that works. Just to make sure it is not a fault with the Juno-66.
You posted a picture of the bottom of the PCB, but most of the connections are on top, traces on the bottom are just going to the DCB interface which is not used any more. Can you also post a picture of the top with the installed Juno-66 ?
I attached part of the schematics. are all the data and control pins of IC55 connected to the Juno-66 ?
30.08.2016 at 08:57 #9285Anonymous
Thanks for your response.
I cut the original cpu out so I can’t put it back in.
Yes all the data control pins are connected.
I’ll take a picture of the top now. I have the schematic and I have already checked every point and it all tests good for continuity and no shorts.30.08.2016 at 09:09 #9286Anonymous
12686_image_5 (1).jpg31.08.2016 at 03:48 #9287
Thanks a lot! This helps!
There seems to have been a mistake during production and one of the two wires on top of the Juno-66 is soldered in the wrong place.
We somehow must have missed this during testing..
This is most likely the cause of your problem.
Attached a picture, just move the wire to next pin as shown
I would also like to apologize for the troubles and the time you spent on this. I sent you a coupon code via mail..
31.08.2016 at 21:35 #9288Anonymous
That was it!!! It works now.
Thanks27.02.2017 at 11:26 #9289Anonymous
I know this was already solved, but just in case it helps someone else I had similar symptoms when I first installed mine – no one wave was completely gone, the other was still there but almost inaudible and very distorted (It was a couple months ago so I don’t remember which was which and I don’t remember if the sub oscillator had any problems), high noise floor and the filter sounded distorted when I brought up the resonance. In my case what had happened was that a stray bit of solder had made a tiny bridge between the point where the 180k resistor is soldered to the bender board and the pad directly below that point in the photo on the manual. It was easy to clean up and no harm was done to anything.
The production flaw in the OP’s JU66 is probably very unlikely to happen again so I’d suggest checking the bender board for shorts first for anyone having similar issues.06.05.2017 at 02:25 #9290Anonymous
I installed the Ju 66 and I’m having the same issue…Can I trouble shoot by disconnecting the red wire going to the bender board??06.05.2017 at 14:20 #9291Anonymous
I should also mention that the waveforms were working for a short time but they would turned off when I pressed the arp button and turn back on when I pressed it again. Then they disappeared for good. Filters and envelopes, LFO all seem to work. I get a basic beating sound when arp is on.
Any insight would be greatly appreciated. Thanks!!06.05.2017 at 17:05 #9292
Please check for shorts and open connections
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