Another Manual Request ...

[Arfa Daily]

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

 

[Franc Zabkar]

On Fri, 20 Nov 2009 01:36:32 -0000, "Arfa Daily"
<arfa.daily@ntlworld.com> 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.

 

[Arfa Daily]

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:hc6cg5lhch407881dt10drm3a289e0emj2@4ax.com...

On Fri, 20 Nov 2009 01:36:32 -0000, "Arfa Daily"
arfa.daily@ntlworld.com> 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