Drawing a complete blank on this one from all the usual manual sites and
search engines. Anyone got the schematics for a Roland JC-50? Numbers on the
PCB are "AP110" and "141-110"

It dates, I believe, from around 1978, and is not the same as others in the
JC (Jazz Chorus) series such as the JC60 or JC120. I particularly need the
bit that shows the wiring of the "Vib-Off-Chorus switch. Someone has
replaced it, and it doesn't work. I am pretty sure that it has been wired
wrongly, but with eight tags and five wires, there's a lot of potential
combinations ... The vibrato oscillator is running as you can see it on a
'scope, and the speed and depth controls work. It's just not modulating the
signal. As to whether the chorus circuitry is working, is anyone's guess.

TIA

Arfa

On Fri, 20 Nov 2009 01:36:32 -0000, "Arfa Daily"
put finger to keyboard and composed:

Drawing a complete blank on this one from all the usual manual sites and
search engines. Anyone got the schematics for a Roland JC-50?

I don't think this is it (Dec 1984), but maybe it's worth a look?
http://www.eserviceinfo.com/download.php?fileid=41031

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

"Franc Zabkar" wrote in message
...
On Fri, 20 Nov 2009 01:36:32 -0000, "Arfa Daily"
put finger to keyboard and composed:

Drawing a complete blank on this one from all the usual manual sites and
search engines. Anyone got the schematics for a Roland JC-50?

I don't think this is it (Dec 1984), but maybe it's worth a look?
http://www.eserviceinfo.com/download.php?fileid=41031

- Franc Zabkar
--

Thanks Franc. That's the one I keep coming up with, and although there are
similarities in some areas to the one on my bench, the 'effects' circuitry
is quite different. Thanks again for trying, anyway.

Arfa