Roland Jazz Chorus 120

[Carlosraj]

Hi

I badly need a schematic for this amp. I downloaded the schematic for the net, but this schematic looks different from the amp I am working on. The schematic shows 3 NJM4558D, 1 MN3007 and 1 MN3101, but my amp has 1 MN4011, 1 MN4013, 1 MN3004 and 1 TA7200P, the rest are all transistors mainly JFETs. Does anyone has a schematic for this amp. Please assist.

Thanks

Carlos

 

[Enzo]

First off, you need to post your serial number. The JC120 had a long career, and had manay revisions, some more dramatic than others. The service manuals have serial numbers included on the title page.

Nick has several versions on his terrific web site. Scroll down to Roland, and open the various choices for JC120, see if any are closer to your unit.

Guitar Amplifier Schematics and more

 

[Carlosraj]

First off, you need to post your serial number. The JC120 had a long career, and had manay revisions, some more dramatic than others. The service manuals have serial numbers included on the title page.

Nick has several versions on his terrific web site. Scroll down to Roland, and open the various choices for JC120, see if any are closer to your unit.

Guitar Amplifier Schematics and more

This has a serial no:135744. Thanks alot Enzo. This info will be of tremendous help to me.

Carlos

 

[Tarzan]

Ach, the JC120...
Do I have to make many unhappy?
I have a customer who found one at the local recycling "something".
I whas hardly visible he said.
After a quick check the connection from the pcb to the jacks had some bad solderpoints.
That's all. He is using it for several years now.
Great sounding amp.