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Floppy
Joined: May 09, 2008
Posts: 66
Location: Berlin
Audio files: 2
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 Posted: Sun Feb 21, 2010 6:16 am Post subject:
Roland Sh2000 Mod as described on Harmony Central
Subject description: http://reviews.harmony-central.com/reviews/Keyboard+And+MIDI/product/Roland/SH-2000/10/1 |
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does anybody know how to exactly wire the 6 pins of the preset switches together ?
the descrition from mr. synth : You simply have to open you SH-2000 and reconnect the wires to all the preset-rocker-switches - sort of making a straight pass.
i tried some combinations already but it doesnt seem to change the sound with 2-3 wirings. will the effect only be audible when all the connections are done ?
there was a discussion on the sdiy list as well : http://dropmix.xs4all.nl/pipermail/synth-diy/2009-May/016740.html |
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ickystay
Joined: Nov 15, 2006
Posts: 143
Location: Oregon
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| Posted: Mon Mar 01, 2010 3:37 am Post subject:
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It does not compute for me. Maybe the attached files will help.
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Floppy
Joined: May 09, 2008
Posts: 66
Location: Berlin
Audio files: 2
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| Posted: Mon Mar 08, 2010 2:33 pm Post subject:
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hey icky
thanks for this, but i would really need it explained in words  |
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ickystay
Joined: Nov 15, 2006
Posts: 143
Location: Oregon
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| Posted: Mon Mar 08, 2010 7:34 pm Post subject:
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Oh my, I misread this thread. Those schematics are from a SH1000! 
Sorry. |
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Christian
Joined: Sep 02, 2010
Posts: 11
Location: Canada
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Floppy
Joined: May 09, 2008
Posts: 66
Location: Berlin
Audio files: 2
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| Posted: Thu Sep 02, 2010 9:59 am Post subject:
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| what a great 1rst post Christian! |
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Christian
Joined: Sep 02, 2010
Posts: 11
Location: Canada
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Posted: Fri Sep 03, 2010 5:00 am Post subject:
Re: Roland Sh2000 Mod as described on Harmony Central
Subject description: http://reviews.harmony-central.com/reviews/Keyboard+And+MIDI/product/Roland/SH-2000/10/1 |
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| Christian wrote: | | Floppy wrote: | does anybody know how to exactly wire the 6 pins of the preset switches together ?
the descrition from mr. synth : You simply have to open you SH-2000 and reconnect the wires to all the preset-rocker-switches - sort of making a straight pass.
i tried some combinations already but it doesnt seem to change the sound with 2-3 wirings. will the effect only be audible when all the connections are done ?
there was a discussion on the sdiy list as well : http://dropmix.xs4all.nl/pipermail/synth-diy/2009-May/016740.html |
According to Roland Service Manual for the SH-2000, these preset switches are 4PST toggle switches.
I am not a technician but I checked inside and following are my assumptions about the way these presets work: I noticed that the first pin sends voltage to the matrix board when you activate a preset. The 2nd and 3rd pins are linked somehow to disable other preset switches giving priority to the right side preset tablet in case 2 presets are pressed simultaneously. All other pins are not soldered, so don't try to use them at all. The trick here is about allowing other preset tablets to feed the matrix board when you pressed more than one switch.
Let me do some experiments on my own SH-2000 and I will let you know if it works. |
I got some mixed sounds when I linked pins #2 and # 3 on one preset switch (I choose "singing voice") using a mini alligator clip. Here is what I found during this test.
I am not sure yet whether it is my SH-2000 that has some loose connections somewhere, I got the impression that the modified preset switch produces a sound less louder... most of the results I got give new tones, so really there is a kind of mixed sounds generated by the matrix board that brings you a wider palette of sounds. However, it looks like there is some preset combinations that give a 'muffled' sound due to the way the preset is wired on the matrix board, I guess. Maybe I am wrong though, since I cannot confirm yet if it is just my gear that is not in a good working order.
You can validate quickly the result by modifying only one preset on the right side of the keyboard, let's say the preset 'Song Whistle' or any other you wish to use for this test. When it is done, you are able to select another preset at the left side (just one in this case), and you will hear a mixed sound.
The big task is about changing wirings of all switches. If you are willing to do so, you have to link all pins #2 together. On my side, I think I would not modify the preset 'Wind' at the right side, there is a resistor and more wires soldered on this one, unless I want to mix white noise as well with other presets... keep in mind that the last preset at the left side 'Tuba' is the end of the 'straight pass'. I suggest to use mini clips first.
If you are OK to modify your gear, please let me know what kind of results you can get when it is done.
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| Here is the modfied circuit allowing other presets to be activated altogether. |
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13605 Time(s) |
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| original circuit : when one preset switch is ON, others (at the right side on the diagram) are OFF (disabled). |
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9.41 KB |
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13605 Time(s) |
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| Description: |
| original circuit : all preset switches are OFF, voltage goes thru all of them. |
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8.85 KB |
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13605 Time(s) |
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Christian
Joined: Sep 02, 2010
Posts: 11
Location: Canada
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Posted: Tue Sep 07, 2010 4:12 am Post subject:
Re: Roland Sh2000 Mod as described on Harmony Central
Subject description: http://reviews.harmony-central.com/reviews/Keyboard+And+MIDI/product/Roland/SH-2000/10/1 |
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| Christian wrote: | | Christian wrote: | | Floppy wrote: | does anybody know how to exactly wire the 6 pins of the preset switches together ?
the descrition from mr. synth : You simply have to open you SH-2000 and reconnect the wires to all the preset-rocker-switches - sort of making a straight pass.
i tried some combinations already but it doesnt seem to change the sound with 2-3 wirings. will the effect only be audible when all the connections are done ?
there was a discussion on the sdiy list as well : http://dropmix.xs4all.nl/pipermail/synth-diy/2009-May/016740.html |
According to Roland Service Manual for the SH-2000, these preset switches are 4PST toggle switches.
I am not a technician but I checked inside and following are my assumptions about the way these presets work: I noticed that the first pin sends voltage to the matrix board when you activate a preset. The 2nd and 3rd pins are linked somehow to disable other preset switches giving priority to the right side preset tablet in case 2 presets are pressed simultaneously. All other pins are not soldered, so don't try to use them at all. The trick here is about allowing other preset tablets to feed the matrix board when you pressed more than one switch.
Let me do some experiments on my own SH-2000 and I will let you know if it works. |
I got some mixed sounds when I linked pins #2 and # 3 on one preset switch (I choose "singing voice") using a mini alligator clip. Here is what I found during this test.
I am not sure yet whether it is my SH-2000 that has some loose connections somewhere, I got the impression that the modified preset switch produces a sound less louder... most of the results I got give new tones, so really there is a kind of mixed sounds generated by the matrix board that brings you a wider palette of sounds. However, it looks like there is some preset combinations that give a 'muffled' sound due to the way the preset is wired on the matrix board, I guess. Maybe I am wrong though, since I cannot confirm yet if it is just my gear that is not in a good working order.
You can validate quickly the result by modifying only one preset on the right side of the keyboard, let's say the preset 'Song Whistle' or any other you wish to use for this test. When it is done, you are able to select another preset at the left side (just one in this case), and you will hear a mixed sound.
The big task is about changing wirings of all switches. If you are willing to do so, you have to link all pins #2 together. On my side, I think I would not modify the preset 'Wind' at the right side, there is a resistor and more wires soldered on this one, unless I want to mix white noise as well with other presets... keep in mind that the last preset at the left side 'Tuba' is the end of the 'straight pass'. I suggest to use mini clips first.
If you are OK to modify your gear, please let me know what kind of results you can get when it is done. |
I did it and it works! I simplified the soldering task though... too many wires to resolder and I am not a skilled to do so. So I took another way to link all preset switches together. I added wires with hooks at both ends and soldered them between each preset connectors. So it means that I left the original wiring in place. It took me at least 3 hours to complete this task. See diagram for better understanding. Hope it helps.
| Description: |
| Preset "Wind" not mixed. New wires soldered as "Bridges" between connectors, to avoid resoldering wires that link pin #3 to #2. |
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26.78 KB |
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367 Time(s) |
| This image has been reduced to fit the page. Click on it to enlarge. |
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zgogor
Joined: Jan 08, 2006
Posts: 9
Location: paris
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| Posted: Sat Feb 05, 2011 3:13 pm Post subject:
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hi guy's,
any idea to tune a sh-2000 ? The tune button works but some notes are out of tune .
any services plan available on the web ? I try to find one but no luck .
thank you very much
zGo |
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Christian
Joined: Sep 02, 2010
Posts: 11
Location: Canada
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| Posted: Tue Feb 08, 2011 5:49 am Post subject:
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| zgogor wrote: | hi guy's,
any idea to tune a sh-2000 ? The tune button works but some notes are out of tune .
any services plan available on the web ? I try to find one but no luck .
thank you very much
zGo |
With such an old gear, I often heard that the culprit component to check is the power supply... or capacitors surrounding it. You may need to replace some of them. |
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zgogor
Joined: Jan 08, 2006
Posts: 9
Location: paris
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| Posted: Sun Feb 13, 2011 7:06 am Post subject:
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thx Christian,
good start for me .
If someone know a good place in Los Angeles to find a power supply or a good vintage services shop ?
zGo |
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philicorda
Joined: Jan 18, 2012
Posts: 3
Location: Tralfamadore
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| Posted: Wed Jan 18, 2012 9:12 pm Post subject:
THE MOD IS INCOMPLETE |
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READ THIS!
The mod as described is incomplete.
There is a green wire going from the furthest left preset switch that activates a preset called 'All Off'. The 'All Off' preset is a simple sound that is activated when none of the other preset switches are engaged. It does not have an oscillator, but changes the envelope and filter settings. You must disconnect this wire, or the settings of the 'All Off' preset will always be combined with any other selected preset. This means you cannot get the original SH2000 sounds back when not combining tabs.
The reason this happens is that the green wire is at the end of the chain of switches that are bypassed with this mod. In an unmodified synth, selecting any preset would break the chain and disengage the 'All Off' preset.
I discovered this when I bought a SH2000 that someone had done this mod on, and it didn't sound very good. |
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Christian
Joined: Sep 02, 2010
Posts: 11
Location: Canada
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| Posted: Thu Jan 19, 2012 5:33 am Post subject:
Re: THE MOD IS INCOMPLETE |
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| philicorda wrote: | READ THIS!
The mod as described is incomplete.
There is a green wire going from the furthest left preset switch that activates a preset called 'All Off'. The 'All Off' preset is a simple sound that is activated when none of the other preset switches are engaged. It does not have an oscillator, but changes the envelope and filter settings. You must disconnect this wire, or the settings of the 'All Off' preset will always be combined with any other selected preset. This means you cannot get the original SH2000 sounds back when not combining tabs.
The reason this happens is that the green wire is at the end of the chain of switches that are bypassed with this mod. In an unmodified synth, selecting any preset would break the chain and disengage the 'All Off' preset.
I discovered this when I bought a SH2000 that someone had done this mod on, and it didn't sound very good. |
Thanks alot for your input!! |
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philicorda
Joined: Jan 18, 2012
Posts: 3
Location: Tralfamadore
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| Posted: Thu Jan 19, 2012 10:25 am Post subject:
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| Christian wrote: | | zgogor wrote: | hi guy's,
any idea to tune a sh-2000 ? The tune button works but some notes are out of tune .
any services plan available on the web ? I try to find one but no luck .
thank you very much
zGo |
With such an old gear, I often heard that the culprit component to check is the power supply... or capacitors surrounding it. You may need to replace some of them. |
The problem here is the scaling of the osc voltage control by the logarithmic multiplier. It does tend to drift occasionally.
The scale tuning procedure is described in the service manual. It's a bit fiddly, so don't mess with the low and high scale tuning pots without reading it first. You really need to follow the procedure exactly!
Sometimes, the scale tuning pots seems to get a bad track connection after 20 years or so, so just moving them a little and returning them to their original positions sorts it out. |
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