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 Forum index » Instruments and Equipment » General Discussion
Roland "Planet S" MKS30
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EdisonRex
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PostPosted: Tue Apr 24, 2012 10:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh wait. it's a JX-3P. I have one of those. Laughing But it's in the USA. I fired it up last September and it still sort of works.
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DrJustice



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PostPosted: Tue Apr 24, 2012 3:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
I did the test and found that the vibrato effect is on board positions 4, 5 and 6. I rotated all the modules around, and still, it's on 4, 5, and 6.
So, straight away, I've removed the faulty 80017 and made the empty position 6. That gives it the best playability it's had for a long time, 3 steady notes! too much coffee
Now I have to work out what is creating this vibrato on the main board.

What's the nature of the vibrato - is it a steady 'real' vibrato, or is it erratic?

The separate Osc1 and Osc 2 clock generators for the DCO counters are common for all voices, so if it made the vibrato it should happen for all voice slots.

It looks like position 4, 5 and 6 get their square wave's from IC 32 (Osc 1 out) and IC 34 (Osc 2 out and sync in). So if the vibrato is is only for 4, 5 and 6, I'd check the connections between the offending voices and IC 32/34.

Are both Osc 1 and Osc 2 affected? If it was only Osc2 it could perhaps be related to the sync.

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Scott Stites
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PostPosted: Sun Apr 29, 2012 2:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow, Uncle K, you've got more guts than me. I've always been timid around actual, real vintage synthesizers. Seems to me that someone had designed a surface mount/PCB replacement for the 80017, or am I mistaken? Hmmm...

A sound sample of the vibrato might help to figger out where the vibrato is coming from. Maybe....

Cheerio,
Scott

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Uncle Krunkus
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PostPosted: Sun Apr 29, 2012 4:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the cred Scott,
Looks like you've been a busy boy too!

Yeah, I might try doing a recording so you can hear what it's like.
I still need to track down a calibrating procedure, there are 4 trimmers per 80017, which all got mixed up in the acetone bath! Laughing
That would help with the overall sound by heaps, but I'm unsure where to start.
I still haven't given up on the dead 80017 either, just not sure how to work on these little ceramic boards, or if I even can. Confused

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Uncle Krunkus
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PostPosted: Fri May 04, 2012 1:09 am    Post subject: Reply with quote  Mark this post and the followings unread

EdisonRex wrote:
Oh wait. it's a JX-3P. I have one of those. Laughing But it's in the USA. I fired it up last September and it still sort of works.


Yeah, but the JX3P doesn't use the A80017 hybrid chips. It uses the same SMD chips separately on the main board, with associated, through hole, passives to create the same VCF/VCA module.
The hybrids are a kinda ceramic substrata, with the SMD OTAs and OP-AMPs soldered onto them. The caps and resistors are layer built onto the ceramic substrata. And,...... the traces are thin, and hard to solder to. Has anyone worked on these chips?

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EdisonRex
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PostPosted: Fri May 04, 2012 1:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah I read more from this site which I'm sure you're familiar with.

I'd imagine the traces need to be deoxidised and fluxed in order to get anything to stick to them. It all looks really fiddly.

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infindebula



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PostPosted: Tue Aug 14, 2012 6:26 am    Post subject: Reply with quote  Mark this post and the followings unread

As far as calibrating the voices, I suggest you look at (closely) at the Juno-106 service manual which offers detailed info about how to calibrate the 80017s. Basically with the 4 trimmers you are tuning the VCFs to track the keyboard and adjusting the resonance so they all match.

The Juno 106 has test points for this. If you look at the schematic you'll probably find similar points in the MKS-30.
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infindebula



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PostPosted: Tue Aug 14, 2012 10:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Just after I posted, I found the full MKS-30 Service Notes including calibration instructions at http://www.synfo.nl/pages/servicemanuals.html

Very nice site there - strongly consider donating if you find it useful!
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Uncle Krunkus
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PostPosted: Wed Aug 15, 2012 2:02 am    Post subject: Reply with quote  Mark this post and the followings unread

That link is dead. Crying or Very sad
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Blue Hell
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PostPosted: Wed Aug 15, 2012 2:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
That link is dead. :cry:


Hmm, that mks-30- thing? not dead here ...

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Zodiak



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PostPosted: Wed Aug 22, 2012 12:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks for the diary, I have a very early JX-3P which doesn't know it yet but will be going through the same process very soon.

I had no idea about the VCA chips being a problem, but they are now on my list.

I mainly use turned pin sockets because I have found them to be slightly more robust, but also because it is possible to solder them to both sides of a PCB making the repair of damaged tracks much easier.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The IC I have removed does not go back into this socket, but I solder it into an identical one, or an IC header and plug that in instead. This reduces one tricky job to two simple ones and you only have to heat up the IC leg for a very short time.

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MusicMan11712



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PostPosted: Thu Aug 23, 2012 1:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

infindebula wrote:
Just after I posted, I found the full MKS-30 Service Notes including calibration instructions at http://www.synfo.nl/pages/servicemanuals.html

Very nice site there - strongly consider donating if you find it useful!
Thanks for the link!!!!! It looks like a super nice resource. Two years ago I gave up trying to find the MKS-10 Service Notes on-line and paid approx. $25 for a paper copy. I posted a link to the site in the thread from 3 years ago where people were looking for the MKS-10 service notes.
Steve
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