Weird Juno-106 behavior (Page 1 of 2)

Dunno, but if it's really only on saved patches that used to be fine, it might be the first sign of a dying battery. Most of the time dying batteries cause patches to first act slightly weird, then act absolutely weird, with strange modulations and lots of noise, and finally act erm... empty.

If it is the common voice chip problem u can buy new ones here:
http://www.analoguerenaissance.com/D80017/

i like this guy "stupid question fee: 10 euro"

whatcha talking about
juno 106 is THE synth

Unicity : the problem was on the filter/Vca chip or the waveforms chip?

Please check also the new topic still about juno 106

A guy that was involved in making the 106 wrote somewhere there's nothing you can do...
There is something about the voicechips that makes them not last for ever ,
and i believe his judgement was they would last for 20-25 years.
I'm not sure but i think it was something about the material the chips are made out of that isn't resistant
to heating and cooling.

I was hoping my 106 was special,  but yesterday it started to make weird crackling noises and some
notes were less loud than others. They still work now, but i think this is the beginning of the end 

How much of a techie do you have to be to replace the voice chips ?
Is there soldering involved ?

@ mr pauli,

Yes there is some soldering involved.
First you have to release the voice chips from the board and then solder the new ones in.
From this site: http://www.analoguerenaissance.com/D80017/

Installation

-Installation is straightforward: remove the defective 80017A , replace it with my clone and re-adjust your juno as described in the service manual.
-My clones not only sound exactly as the original ones, they also behave exactly the same. No adjusting of the other voices, no adjustments to the main pcb. Just do as is told in the ROLAND JUNO-106 SERVICE MANUAL. Nothing less, nothing more.
-Although it is straightforward and perfectly described in the juno-106 service manual this requires electronics knowledge and the proper tools: digital multimeter, oscilloscope and frequency counter (frequency adjustment can also be done with a musical instrument tuner or soundcard + frequency measurement program).
-Do not believe people who are selling originals or clones who say this is just a remove-replace-play operation. They are lying. Even if you do replace it with an original chip, this adjustment procedure is necessary. Without doing so it won't sound right.
-The new version's adjustment is now easier. Due to the closer tolerance, only slight trimming is necessary. Trimpots should all be close to the center position after adjustment. One being way out center is a good indication of something wrong.
-One thing you have to be careful about: When doing the adjustment procedure, do not short TP8-TP13! This will fry the output buffer of my clone (the same happens with an original chip).'

"the $10 stupid question thing "

that's why i ask here
if only you'd live around here in The Hague basscakes...
i can never pull that off myself
smartest thing will be waiting for the one voice to really die,  just to be sure
then get 6 new chips and have someone replace all six right away
to save myself from having to live trough this stuff five more times

does anyone know a good synthdoctor in or around The Hague ?

thanks
sainteric ... the name does ring a bell.
must have heard good stuff about him.

if you just have the problem on each 5 or 6 note/voice - it

have checkked - you are RIGHT - just get the bad note fixxed by something (tape or paper) and you are able to use all 5 VOICES over the complete keyboard.....JUNO-105 thats it...you will maybe never use all 5 oktaves in a track so this is a good idea when you have a dead voice..

sometimes the voices begin tu humm before they die....so in this case you can forget it...

.a

The voices sometimes start to crackle, get stuck on, or get quieter/louder than the other voices when they fail. I also noticed that in mine and in a friends 106, both of which had failed voices that the failing voices usually worked for the first 5-10 minutes the synth was on before stopping.

This may have already been mentioned, but if you want to see which voices are causing the problems you can use the diagnostic mode.

1. with the synth off, hold the "Key Transpose" button and turn the synth on
2. release the key transpose button and you should see 2 staggered dashes on the display
3. hit both Poly buttons as if you were putting the Juno in Mono mode
4. Press any key repeatedly and you will now see the screen cycle through 1 to 6, this is playing each voice individually and you should be able to tell which chip is bad, or tell which pair of chips is associated with a bad waveshaper

looking inside the Juno
1. When you open the Juno, the voice chips are on the modulation board to the far left.
2. There are 9 chips staggered, the odd number chips are the voice chips.
3. Don't quote me on this, but I think the chips go from right to left with the furthest right being voice 1.

I did not have a very hard time removing the chips once I had cut the chip away from the leads. Just be careful not to overheat the traces and lift them off the board. This shit is old, and may be a bit sensitive
. I would highly recommend getting your hand on a solder sucking tool like this at the very least for this project ---
http://en.wikipedia.org/wiki/Solder_sucker