Jc-120 Schematic -

Inside the "King of Clean": A Look at the Roland JC-120 Schematic First introduced in 1975, the Roland JC-120 Jazz Chorus

Mono Reverb: Interestingly, while the chorus is stereo, the reverb circuit is typically in mono, often sending the signal to both channels after the chorus effect. jc-120 schematic

• Dead chorus (often the BBD chip: MN3004 or MN3204)
• Noise issues (transistors: 2SC458 → notorious for becoming noisy)
• Power amp failures (STK power packs)
• Hum (filter capacitors)

The JC-120 schematic is a complex layout that features a dual-channel preamp, a four-stage power amp, and a comprehensive EQ section. Here's a breakdown of the schematic: Inside the "King of Clean": A Look at