The Roland JC-120 Jazz Chorus Go to product viewer dialog for this item.
Roland did not make just one JC-120. Production ran from 1975 through the early 2000s (and later reissues). The schematic changed significantly over time. Searching for a "JC-120 schematic" requires knowing your specific version. jc-120 schematic
Open your and find the power supply on the right-hand side. You will see a center-tapped transformer feeding a bridge rectifier. The Roland JC-120 Jazz Chorus Go to product
| Source | Notes | |--------|-------| | | Search “Roland JC-120 service notes” – sometimes free after registration. | | Synthxl.com | Has clear JC-120 scans (preamp, power amp, chorus). | | Elektrotanya.com | Free download after short wait. | | Music Electronics Forum | Archived service manuals. | | Schematic Heaven (archived) | Mirror sites still host old files. | The schematic changed significantly over time
Roland JC-120 Go to product viewer dialog for this item. has been in production since 1975, and its internal circuitry has changed significantly over the decades. To find the correct "piece" or component for your repair, you first need to identify which version you have. Identifying Your Version