Roland SH2000 aftertouch problem

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Roland SH2000 aftertouch problem

Postby fantastic cat » Sat Aug 15, 2009 8:13 pm

Hi!
I have problem with my roland sh-2000. Aftertouch section doesn't work. I've looked under the hood, but everything seems to be fine - i cant find any visible damage. What can be the problem? Where should i look? What should i do?
Unfortunately i don't know much about servicing electronic devices...
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Re: Roland SH2000 aftertouch problem

Postby Maschinengeist » Sat Aug 15, 2009 9:06 pm

You'll need the service manual (ie p.28) & and an oscilloscope to adjust the touch sensibility. Unfortunately, you'll need a tech if you're not too much at ease with servicing electronic keyboards.
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Re: Roland SH2000 aftertouch problem

Postby fantastic cat » Sat Aug 15, 2009 9:39 pm

You mean it can be done manipulating some internal pots? Only thing i can't do is to replace elements, solder etc.
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Re: Roland SH2000 aftertouch problem

Postby rhino » Sat Aug 15, 2009 11:20 pm

is the SH-2000 what MultiVox cloned as the MX-2000?
(lloks just like it on the VSE archive pages)
if so, the MV version has a Hall-effect sensor to trigger the aftertouch. looks like a flat transistor. the keyboard has a metal bar that moves during aftertouch and a magnet that moves toward and away from the sensor. IIRC i'vs seen them in Jameco electronics

EDIT:
found a nasty copy of the SH-2000 schematic on the net, can barely read it, but this synth DOES use the Hall sensor.
there is a 'range' and 'offset' pot also that MIGHT be part of the problem...but my money is on the sensor. Find a qualified tech.

EDIT 2:
better yet, get a real copy of the service manual from MuzikElektronix (above) and maybe even contact Steph about taking care of the problem for you.
"A thing may seem impossible...until it's done."
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Re: Roland SH2000 aftertouch problem

Postby fantastic cat » Sun Aug 16, 2009 11:54 am

Yes, there's metal bar with flat transistor inside. I've checked it for mechanical issues, but can't find any. So it's probablyelectronic - i will look for technician.
Now, after your post about the sensor, i'm sure... when i've disassembled sh2000 first time this transistor was very suspicious for me.

Thanks!

edit: After 15 minutes synth is working perfectly again. Adjustment settle everything - two pots on control board - offset and gain - are responsible for aftertouch. In this case no oscilloscope is needed, ears are enought.
Thanks again!
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Re: Roland SH2000 aftertouch problem

Postby Maschinengeist » Sun Aug 16, 2009 3:50 pm

Good news! Hope it solved your problem for good. Thanks for sharing.
-------------------------------------------------------------------
MuzikElektronix.com
Music electronics repair & More
Help? See TechZone
Parts? email!
Service Manuals?+/-2000 documents!
Sorry, they aren't free
Now on FACEBOOK: "Muzik Elektronix"
User avatar
Maschinengeist
Supporting Member!
Supporting Member!
 
Posts: 1451
Joined: Sat Jan 21, 2006 3:42 pm
Location: Sherbrooke, Quebec, Canada
Real name: Steph. J
Gear: Multimeter
Frequency Counter
Oscilloscope
Signal Generator
Logic Probe
and more stuff
Band: Cybernetik


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