Search found 30 matches

by psygoat
Mon May 09, 2016 6:33 pm
Forum: HELP!
Topic: Crumar DS2 problem (clock noise?)
Replies: 9
Views: 1867

Re: Crumar DS2 problem (clock noise?)

That's a result.

Must be a fairly common problem with these - even though it's a really unusual fault.

They're great synths but the build quality is awful.
by psygoat
Mon Apr 25, 2016 1:29 pm
Forum: HELP!
Topic: Crumar DS2 problem (clock noise?)
Replies: 9
Views: 1867

Re: Crumar DS2 problem (clock noise?)

If anyone has the same problem, try replacing the ic's on the waveshaper pcb. They're all standard cmos logic ic's, easily available and they are socketed, so it's no problem to change them. Sorry to resurrect an old thread, but I just picked up a DS2 with this same high pitch sound exactly as you ...
by psygoat
Sat Jan 09, 2016 1:57 am
Forum: HELP!
Topic: CS20M faders
Replies: 2
Views: 551

CS20M faders

Hi. I am repairing a Yamaha CS20M - the release fader is broken. It is an ALPS slider marked 10kC. I was wondering what the 'C' is - is it log, linear or another type. I have a copy of the service manual, but unfortunately the page with the parts list on it is not there. Does anyone know what this i...
by psygoat
Tue Oct 07, 2014 8:36 pm
Forum: HELP!
Topic: Juno 106 - wierd distortion fault
Replies: 69
Views: 17245

Re: Juno 106 - wierd distortion fault

Thanks - I'll let you know how I get on.
by psygoat
Tue Oct 07, 2014 4:53 pm
Forum: HELP!
Topic: Juno 106 - wierd distortion fault
Replies: 69
Views: 17245

Re: Juno 106 - wierd distortion fault

I can see that - I'll have to think hard about that one as the voice chips are a bit tricky to get out in one piece. Thanks.
I can always pull them and put a socket in -that'll make things easier later.
What do you think is the best method for getting them out btw?
by psygoat
Mon Oct 06, 2014 6:47 pm
Forum: HELP!
Topic: Juno 106 - wierd distortion fault
Replies: 69
Views: 17245

Juno 106 - wierd distortion fault

Hi. I've got a juno 106 in for repair. I've done quite a few junos but this is a strange one - Symptom - distorted sound on all of the voices apart from 1. If I check with a scope all the outputs from the VCF on the voice chips show a clean signal. If I put it in test mode and cycle through the voic...
by psygoat
Tue Jan 29, 2013 11:43 pm
Forum: HELP!
Topic: Yamaha SK50D service manual ?
Replies: 0
Views: 423

Yamaha SK50D service manual ?

Hi Folks.

Has anyone got a link or a copy for an SK50d service manual?
There are a few for sale on the net, not sure about the quality, but haven't found anything for free.
If anyone can has one then please let me know.

Thanks.
by psygoat
Thu Jan 17, 2013 6:39 pm
Forum: HELP!
Topic: JX8P service manual
Replies: 2
Views: 309

Re: JX8P service manual

Thanks, what an excellent site.
I'm surprised I've never come across it before
Star!
by psygoat
Thu Jan 17, 2013 6:02 pm
Forum: HELP!
Topic: JX8P service manual
Replies: 2
Views: 309

JX8P service manual

Hi.

Anyone got a JX8 service manual that they can email me or a link for one?

Much obliged, fellow techs

M
by psygoat
Wed Jan 16, 2013 12:13 am
Forum: HELP!
Topic: Crumar DS2 problem (clock noise?)
Replies: 9
Views: 1867

Re: Crumar DS2 problem (clock noise?)

If anyone has the same problem, try replacing the ic's on the waveshaper pcb.
They're all standard cmos logic ic's, easily available and they are socketed, so it's no problem to change them.
by psygoat
Fri Dec 28, 2012 8:38 pm
Forum: HELP!
Topic: Dx7 programming
Replies: 18
Views: 6129

Re: Dx7 programming

I did a lot of programming on the DX9, which is a 4 operator version of the DX7 so I would recommend switching off (turning volume down) 2 of the operators. You'll find it much easier to make usable sounds and avoid the standard ring modulation / metal white noise that is so easily created with the ...
by psygoat
Thu Dec 27, 2012 10:56 pm
Forum: HELP!
Topic: Korg Polysix Arpeggiator
Replies: 8
Views: 1030

Re: Korg Polysix Arpeggiator

It's the way it's designed.
by psygoat
Thu Dec 27, 2012 6:44 pm
Forum: HELP!
Topic: What power supply for tr-707
Replies: 2
Views: 1465

Re: What power supply for tr-707

bubblymommygun wrote:Your local thrift store is probably bursting at the seams with adequate power supplies. Just check the polarity and the more mA the better!
Just make sure you buy a REGULATED power supply. In a small unit like the 707, you'll probably find that 500ma is easily enough to power it.
by psygoat
Thu Dec 27, 2012 6:37 pm
Forum: HELP!
Topic: Reconfiguring a CMU-800 power supply from 117V to 240V?
Replies: 1
Views: 492

Re: Reconfiguring a CMU-800 power supply from 117V to 240V?

I think the table in the bottom left hand corner is the wiring colours for for various transformers that might be fitted in the unit. The colours of the wires from the transformer match up with the column for 117volts. This tells you that the transformer is a 117v one. There is no way to reconfigure...
by psygoat
Thu Dec 27, 2012 5:46 pm
Forum: HELP!
Topic: Tips on SH-101 LFO repair
Replies: 5
Views: 1371

Re: Tips on SH-101 LFO repair

90% of problems on the sh101 are caused by the rubbish sliders.
Check VR10, LFO rate control, before you do anything else.