Roland jazz chorus 120 early version ser no 615335

[Arbutt]

Hi . This amp is in a right mess. But I now got it working
One of the reported faults is chorus and vibro not working
No change in the sound whatever. I went looking for a schematic but can't seem to find the right one. Component reference are all wrong and the chips being used are different
This has a ta7200 -mn3002 - tc4013 and tc4011 .
Checked with the pot ref and again none match .
Depth vr14 speed vr15 reverb vr12

[g1]

It's too big to post in this forum, but Dr.Gonz has graciously posted a link here:
http://music-electronics-forum.com/s...l=1#post454104

(edit: direct link: http://dropcanvas.com/pu3pr )

[Arbutt]

Thank you g1. I found a service manual with many different versions inc the one I need. From the link you put up. Took a while to track it down . All I've got to do now is fix it.

A

[g1]

?
The post I linked (#7 on that page) links to only one service manual (JC-120 3rd sm)
Anyway, glad you found it eventually.