Jc-120 Schematic ((top)) 〈Android〉

1. Where to Find the Official Schematic

Roland historically provided service notes. The most reliable free sources:

B. Chorus / Vibrato Section (MN3002 BBD + MN3101 clock)

• Two BBDs for stereo effect.
• Common failure: No chorus – check MN3002, clock, or trimpot calibration.
• Typical fix: Replace BBDs (hard to find, use MN3207 adaptation).

Channel 1 provides a pure, direct signal path, while Channel 2 adds the famous effects, including a spring reverb and the controversial "distortion" knob. Finding the Right Schematic jc-120 schematic

Technical Communities: Enthusiast forums like SSGuitar often host specific schematic versions, such as the "1984" op-amp based design or earlier discrete versions. Two BBDs for stereo effect

You can access official and archival documents through these sources: Channel 1 provides a pure, direct signal path,