Jc-120 Schematic -

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.

: The schematic shows two distinct input paths. Channel 1 is purely clean, while Channel 2 integrates the effects circuit (chorus, vibrato, reverb, and distortion). Dimensional Space Chorus jc-120 schematic

The JC-120 has undergone several revisions over its 40+ year history. To ensure you have the correct diagram, check your serial number and physical features: The ultimate JC-120 thread Roland did not make just one JC-120

Most "stereo" amps use one power section to drive multiple speakers. The JC-120 has two independent power sections, each pushing 60 watts to its own 12-inch speaker. Phase Mixing: Searching for a "JC-120 schematic" requires knowing your

The circuit relies on Bucket Brigade Device (BBD) chips, specifically the MN3002 (vintage) or MN3007 (later revisions), to create short, modulated delays.

| Section | What it shows | Useful for | |---------|---------------|-------------| | | Two identical channels (Normal/Bright) using NJM4558 or MC1458 op-amps | Gain mods, tone stack analysis | | Chorus/Vibrato | BBD delay lines (MN3004 or MN3007), clock generator (MN3101), LFO | Repairing chorus "whoosh" or clock noise | | Power Amp | Discrete complementary symmetry (2SD718/2SB688 or similar) | Bias adjustment, output transistor replacement | | Power Supply | ±15V regulated (for op-amps), +25V for chorus BBD, +45V for power amp rails | Hum diagnosis, recap planning |