Fukbox Instructions Access

| Symptom | Likely Cause | Fix from the Manual | | :--- | :--- | :--- | | | Power polarity reversed | Check battery snap red/black wires. | | Huge 60Hz hum | Missing ground on input jack | Solder the sleeve lug to the ground plane. | | Farting out on low notes | C3 (47uF) is backward | Re-solder with correct polarity. | | Thin, fizzy sound | Wrong IC (using JRC4558 instead of TL072) | Replace IC. TL072 is mandatory. | | No bypass sound | 3PDT switch wired wrong | Breakout board required; check lug 4-5-6. |

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