Juno 106 bass/chorus crackling

morebutter · 7th February 2007

Anybody else have this problem? I've noticed it on a couple different Juno 106's. The bassier notes and chorus have crackling static. Any solution to this problem?

matthias · 7th February 2007

I think this is normal, if you set the vca level too high...

if it's not related to the vca level, your unit could have a fault..

synth.ignition · 7th February 2007

it could be a jack board issue. does it only crackle when the level switch on the back is set to H or does it also do it on the M and L settings?

catapultJ · 7th February 2007

I'm having this same exact problem on my Juno 106.

If the sound is bassy when I turn the chorus on I get crackles. It might be caused by leaky caps in the chorus section. I haven't had the chance to look at it yet, the thing is a monster to even take apart.

Let me know what you find.

-jason.

morebutter · 7th February 2007

My switch on the back was on H, in addition I had the volume knob all the way up. set the switch to M, lowered volume to 3 oclock and everything is fine.

Thanks!

morebutter · 7th February 2007

I should add that the chorus works, but it gets overloaded very easily, especially when playing chords. Could be normal or could need a recap, i dont know. But I rarely use the chorus anyway.

backhair · 7th February 2007

the same thing happens on my Juno 60. i always just assumed that it being a rather early stab at digital chorus, bass just wasn't handled that well. the lower my frequency slider, the greater the chance the chorus can't cope.

synth.ignition · 8th February 2007

Quote:

Originally Posted by morebutter

My switch on the back was on H, in addition I had the volume knob all the way up. set the switch to M, lowered volume to 3 oclock and everything is fine.

Thanks!

you may need to recap, but probably just C21 and C22 on the 106's jack board (located between the two output jacks). no reason to bother with it now though if you're ok with the M output level. maybe hold off until you have to replace a vcf/vca chip.

morebutter · 9th February 2007

Quote:

Originally Posted by synth.ignition

you may need to recap, but probably just C21 and C22 on the 106's jack board (located between the two output jacks). no reason to bother with it now though if you're ok with the M output level. maybe hold off until you have to replace a vcf/vca chip.

Thanks for the tip!

triez · 9th February 2007

Having fixed Juno's by the dozen, the chorus board issues are usually caused by the same culprit that plagues a lot of Roland gear from that era, particularly TR909's and even the power supplies of Jupiter 6's... There are 2 types of transistor that Roland used heavily back then, a PNP and an NPN type and they both have a high failure rate, usually going leaky and causing all kinds of distortion.

2SA1115 and 2SC 2603. These transistors are nearly always the problem, even moreso than electro caps. When you turn on your TR909 and one of the sounds spits and latches up, inevitably you will find a leaky 1115 or 2603 in there, and I have found many Juno's with bad chorus boards with the same thing going on.

They are tiny black transistors, the top row of markings on each say 115 and 603 respectively, the case is too small to put the entire code on each. While you could indeed have a bad cap or jack, don't overlook the transistors also.

KennaOkoye · 3rd January 2012

By any chance are these Transistors you speak of located on the same board as my Voice chips?! Because I STILL get the same crackling with M settings only when Chorus is turned on! it has nothing to do with H setting... Please let me know thanks! This is my problem

I have to turn my VCA very low for it to stop... :(

Again, this happens when I play chords and chorus is on

KennaOkoye · 3rd January 2012

Overloaded audio listen here

bolt · 6th January 2012

I have the same thing going on with my 106 and like to know how to fix it myself.

KennaOkoye · 16th January 2012

There is a service manual here where you can do it, but you need awkward tools. Just send it to a tech, I did, and mine works perfectly now. You can also find a local tech to do anything... you want, no need to send the board anywhere, I learned my lesson!!!

Preston135 · 16th January 2012

No problems on a chorus, that three point switch at the back makes it crackle every now and again, switch it across a few time's and jobs a good'n

SDC · 19th March 2012

Do you guys use chorus on Juno-60 or 106 for Bass?

Im pretty sure most of you use, but, at least to my ears, the bass doesnt sound right because of the super wide stereo image?
On Juno-60 position 1+2 it's ok, but on 106..

I just get a 60 and it sounds so bassy specially with chorus on - maybe i also need to recap?

KennaOkoye · 1st April 2012

Bass on 60 is a joke.... Bass on 106 is where its at. I miss my 106. If they were cheaper id get both! Chorus on 106 to my ears is better... Nice on bass

Sent from my myTouch_4G_Slide using Gearslutz.com

nms · 1st April 2012

Quote:

Originally Posted by KennaOkoye

Bass on 60 is a joke.... Bass on 106 is where its at.

lol! Ju-60 > 106. Had both, kept the best. Any questions about chorus on bass could be answered by checking in mono. It's a slippery slope but if you get something that works then it works.

audioconsult · 1st April 2012

the crackeling usually indicates a soon to die filter/vca chip...

or bad contacts on the output board...

you need to find out if its on all voices or just on some.. so is it on any key or just crackles on some of them?

7th February 2007	#1
morebutter Gear addict Joined: Jun 2006 Location: Northeast Corridor Posts: 463 Thread Starter	Juno 106 bass/chorus crackling Anybody else have this problem? I've noticed it on a couple different Juno 106's. The bassier notes and chorus have crackling static. Any solution to this problem?

7th February 2007	#4
catapultJ Gear interested Joined: Jan 2006 Location: Philly Posts: 2	Same Here I'm having this same exact problem on my Juno 106. If the sound is bassy when I turn the chorus on I get crackles. It might be caused by leaky caps in the chorus section. I haven't had the chance to look at it yet, the thing is a monster to even take apart. Let me know what you find. -jason.

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7th February 2007	#2
matthias Gear nut Joined: Nov 2005 Location: Frankfurt, Germany Posts: 143	I think this is normal, if you set the vca level too high... if it's not related to the vca level, your unit could have a fault..

7th February 2007	#3
synth.ignition Gear nut Joined: Dec 2006 Posts: 136	it could be a jack board issue. does it only crackle when the level switch on the back is set to H or does it also do it on the M and L settings?

7th February 2007	#7
backhair Gear nut Joined: Dec 2006 Posts: 103	the same thing happens on my Juno 60. i always just assumed that it being a rather early stab at digital chorus, bass just wasn't handled that well. the lower my frequency slider, the greater the chance the chorus can't cope.

9th February 2007	#10
triez Lives for gear Joined: Apr 2003 Location: Australia Posts: 1,316	Having fixed Juno's by the dozen, the chorus board issues are usually caused by the same culprit that plagues a lot of Roland gear from that era, particularly TR909's and even the power supplies of Jupiter 6's... There are 2 types of transistor that Roland used heavily back then, a PNP and an NPN type and they both have a high failure rate, usually going leaky and causing all kinds of distortion. 2SA1115 and 2SC 2603. These transistors are nearly always the problem, even moreso than electro caps. When you turn on your TR909 and one of the sounds spits and latches up, inevitably you will find a leaky 1115 or 2603 in there, and I have found many Juno's with bad chorus boards with the same thing going on. They are tiny black transistors, the top row of markings on each say 115 and 603 respectively, the case is too small to put the entire code on each. While you could indeed have a bad cap or jack, don't overlook the transistors also.

3rd January 2012	#11
KennaOkoye Gear maniac Joined: Sep 2009 Posts: 249 1 Review written	By any chance are these Transistors you speak of located on the same board as my Voice chips?! Because I STILL get the same crackling with M settings only when Chorus is turned on! it has nothing to do with H setting... Please let me know thanks! This is my problem I have to turn my VCA very low for it to stop... :( Again, this happens when I play chords and chorus is on

6th January 2012	#13
bolt Gear Head Joined: Jul 2011 Location: Southern California Posts: 45	I have the same thing going on with my 106 and like to know how to fix it myself.

16th January 2012	#14
KennaOkoye Gear maniac Joined: Sep 2009 Posts: 249 1 Review written	There is a service manual here where you can do it, but you need awkward tools. Just send it to a tech, I did, and mine works perfectly now. You can also find a local tech to do anything... you want, no need to send the board anywhere, I learned my lesson!!!

16th January 2012	#15
Preston135 Gear nut Joined: Jul 2011 Location: Stockton-on-tees Posts: 144	No problems on a chorus, that three point switch at the back makes it crackle every now and again, switch it across a few time's and jobs a good'n

19th March 2012	#16
SDC Gear interested Joined: Jan 2012 Posts: 26	Do you guys use chorus on Juno-60 or 106 for Bass? Im pretty sure most of you use, but, at least to my ears, the bass doesnt sound right because of the super wide stereo image? On Juno-60 position 1+2 it's ok, but on 106.. I just get a 60 and it sounds so bassy specially with chorus on - maybe i also need to recap?

1st April 2012	#17
KennaOkoye Gear maniac Joined: Sep 2009 Posts: 249 1 Review written	Bass on 60 is a joke.... Bass on 106 is where its at. I miss my 106. If they were cheaper id get both! Chorus on 106 to my ears is better... Nice on bass Sent from my myTouch_4G_Slide using Gearslutz.com

1st April 2012	#19
audioconsult Lives for gear Joined: Jan 2012 Posts: 1,472	the crackeling usually indicates a soon to die filter/vca chip... or bad contacts on the output board... you need to find out if its on all voices or just on some.. so is it on any key or just crackles on some of them?